Official Dynam 1500mm B-26 Marauder Thread

[Hardway]

Those ESCs were only meant for 2s - 4s.

Roger that!!! There is the problem...….. Glad they beeped and didn't smoke!!! ;):Cool:

[xviper]

Roger that!!! There is the problem...….. Glad they beeped and didn't smoke!!! ;):Cool:

For sure. I'm a bit surprised that Dynam ESCs would have such "smarts" built in. I've smoked better branded ESCs with just the accepted battery in them.

[Mrdronenut]

Thanks y'all. I worked on that plane for hours,called BTL and TIA. Then I put in a 4s. All good

[Builda]

OK so as everyone knows with every brand of Foamy every so often someone gets a “less than perfect” airframe. This week I had the pleasure of finding mine amongst my many boxed up planes awaiting build-unfortunately it was my B26 ????. It had a few minor things with the fuse where it needs more glue on stuff, but it also had a rather serious mismatch problem with one of the engine nacelle’s, due in part to a badly moulded (I believe) center wing section. I’ve spoken to a number of people on the internet with this plane and it seems I did indeed just get the one bad one???? So yesterday I made a start to try to remove the VERY well glued on engine nacelle-after about an hour with some alcohol (to soften the glue) and some steel rulers, and a scalpel I was able to separate the nacelle without major damage????. Since it’s too windy to fly over the next few days I’m going to slowly chip away at this job I think-I still have planes I wanna maiden this summer so it’s gonna be a slow project for those days I’m in the mood to work on it and I can’t fly for whatever reason. I’ve already sent a message to Dynam with photos and have requested replacement foam parts for the center section so I’ll see what comes of that next week before I get too deep into repairing this. Meanwhile though I will continue to remove the leftover glue on the parts so if I do end up restoring this one, I can do so without leftover glue being a nuisance. I really didn’t want another major project after my last Dynam plane turned into one (by choice), and here we have another????♂️.

Incidentally mine only had one large weight in the tail-it too had come unstuck and was loose in the box so six million dollar question is “does it need it”?? Also has anyone put an incidence meter on this plane to check the AOA of the Hori stab to see if it’s out of level??

I’m staying clear of RCG as too many idiots on there with conflicting opinions-I’ve found this forum to be considerably better for advice. Was really looking forward to getting and flying this plane-I’m just glad I never had to pay full price to get it to NZ or I would be REALLY hacked off being almost $400usd out of pocket (friend is a Dynam Agent so I get good prices and usually decent planes too).

If anyone has any repair tips/advice I’m all ears ok-see the pics for the issue with the Nacelle (now removed) and the moulding imperfection in the wing section on that side.

[xviper]

Builda, although what I see from your pictures, you may have gotten a worse than usual for Dynam, which is expected to have such issues. Rather than you getting "one bad one", I think it's more like some people get "one good one". It's Dynam afterall, and the price reflects a lower tier product line. My center wing section has never sat flush with the top of the fuse. Some people will shave this and that to make it flush but knowing that I bought a Dynam, I'm not fussed about it. The plane does fly adequately well enough. As for that weight, there are two back in the tail cone section. Many people have discovered at least one and sometimes both weights have come loose. Some leave one or both out and some have even gone in there and dug them out. They go as far back as you can get them. I gloop a pile of hot glue and shove it back there as far as my hemostats will reach. Does it need it? Well, that depends on what size battery you use and how far back you can secure it and whether or not you can balance the plane properly like that.
I can't offer much in the way of hints or tricks to repair your plane but it seems to me that you're on your way to getting it done pretty good on your own.
I've owned several Dynam planes, some worse than others but all of them have some sort of deficiency in terms of quality of foam, fitment and electrical issues (eg, retract that don't work when the temps get below ~60F, motor that stutter and ESCs that need to be reset, poor gluing). However, for the price, I've been very happy with Dynam and due to the price point, helped me move along in this hobby.

[Builda]

Builda, although what I see from your pictures, you may have gotten a worse than usual for Dynam, which is expected to have such issues. Rather than you getting "one bad one", I think it's more like some people get "one good one". It's Dynam afterall, and the price reflects a lower tier product line. My center wing section has never sat flush with the top of the fuse. Some people will shave this and that to make it flush but knowing that I bought a Dynam, I'm not fussed about it. The plane does fly adequately well enough. As for that weight, there are two back in the tail cone section. Many people have discovered at least one and sometimes both weights have come loose. Some leave one or both out and some have even gone in there and dug them out. They go as far back as you can get them. I gloop a pile of hot glue and shove it back there as far as my hemostats will reach. Does it need it? Well, that depends on what size battery you use and how far back you can secure it and whether or not you can balance the plane properly like that.
I can't offer much in the way of hints or tricks to repair your plane but it seems to me that you're on your way to getting it done pretty good on your own.
I've owned several Dynam planes, some worse than others but all of them have some sort of deficiency in terms of quality of foam, fitment and electrical issues (eg, retract that don't work when the temps get below ~60F, motor that stutter and ESCs that need to be reset, poor gluing). However, for the price, I've been very happy with Dynam and due to the price point, helped me move along in this hobby.

Hey dude, cheers for your input. I’ve got a number of Dynam birds and I concur, we buy them knowing that we will likely need to sort out a motor, or retracts, or maybe some paint issues (that’s how my Waco mods started-paint issues), my hellcat needed a power upgrade and retract upgrade, I’ve still got 4 Dynam planes I have yet to build, and unlike my FMS Tigercat (which is better than perfect out the box), I’ve always had to do something to a Dynam-but never have I had a n issue like this with the moulded parts! The last time I had an EPO plane with a moulded part is due like this it was actually a Horizon hobby plane! (Parkzone Trojan). The canopy would not fit the fuselage due to the bad moulding, so it’s not just Dynam that have the moulding problems. That out the way, I’ll better assess it over the next few days because as nice as it would be if Dynam replace the parts, I REALLY don’t want to have to rebuild an entire wing section.

the other issues with the plane I expected...cause it’s a Dynam-the hatch doesn’t fit flush, the plastic covers on the guns either side of the Fuselage are falling off, and the other one was the rear machine guns-it looks like someone forgot to put them in before they glued up the fuselage then tried to force them in through the hole in the fuselage-breaking both of the guns in the process!! That’s actually a good thing because I will fill this hole now and to be honest I think those guns would be a nuisance catching on things in the car all the time. So yea, it had its fair share of typical Dynam issues (and I’m yet to test the retracts I might add) but the nacelle was just too much to leave it as it was-I really didn’t want to pull it to pieces but it just wasn’t something I could live with.

ill have another look for weight in the tail but the fuse is pretty light now with everything removed-I’ll try to get this lump of steel glued back in as far back as possible.

my other Dynam birds I have awaiting build are an Me262 (I’m going 12 blade FMS conversion on this and full retract upgrade), an BF110 (needs ESC cooling sorted out the box same as Me262) a hawker tempest (will need the same power upgrade as my hellcat and probably retracts), and a hawker hurricane (which I may just sell online cause I have enough to do with the rest). I’m half tempted today to build my “La Patrona” Tigercat just to give me a morale boost but I think it will have the opposite effect! Lol!

[xviper]

I also have the FMS Ticat. When you build it, you will quickly see how it WILL put the B-26 to shame but then, the Ticat is in a whole other price point ball park. The Ticat's retracts are things of beauty and you will marvel at how they work. You should find very little, if anything, needed when putting the F7F together. It flies so much better and with a lot more authority. Having said this, you should also find that BOTH planes will land like they were on auto-pilot.

[themudduck]

I guess I will chime in - there's LOTS of info earlier in this thread about the weights, balance, stab incidence, and so on. And some conflicting opinions as well.
I would certainly recommend going through the earlier posts, when we were going through initial impressions and flight testing.
I went through all of the fixing with the bad construction and bad fit and hatches and so on

(check the wing attachment points in the fuse)

, but I really like the way my B26 turned out. Its a really nice-flying unique model and has a great look.

I did these things:

- used a smaller battery and no tail weights. Result is a lighter plane (less wing loading). I can fly well over 12 minutes using a 3600.
- balanced it a little further forward than most in this forum (I did a lot of flight testing). Tail-heavy B26 is a BIG BIG no-no. "The Widowmaker" will get you if you don't pay attention.
- shimmed the stab TE up several mm. This helped a lot with overall flying characteristics
- cut down the control throw on the elevator in particular.
- replaced the race-car wheels with Robart wheels - and I installed a slightly larger nose wheel to raise the nose, this gives the model a slight positive (and prototypical) AOA while on the ground.
- I always take off with half-flaps and land with full flaps. Without the flaps, the model will snap in a heartbeat at lower speeds.

Sadly, I left the toy pilots in the office. but I repainted them and gave the pilot a mustache and flying wings!

[Mrdronenut]

Thanks MD. I've not yet had an opportunity to maiden mine,along with 3 other planes due to health issues,and very windy conditions. Let me throw in before I forget(66yr old brain) that I've got the P-61. My advise.....get one. Mine has all the problems stated in the other forums,.gaps,big gaps,gaps....oh,glue everywhere,really really weak booms,did I mention gaps? That being said,it's an awesome looking plane. I'll maiden it this week,along with my B-26,which is ready for deployment.

[themudduck]

Thanks MD. I've not yet had an opportunity to maiden mine,along with 3 other planes due to health issues,and very windy conditions. Let me throw in before I forget(66yr old brain) that I've got the P-61. My advise.....get one. Mine has all the problems stated in the other forums,.gaps,big gaps,gaps....oh,glue everywhere,really really weak booms,did I mention gaps? That being said,it's an awesome looking plane. I'll maiden it this week,along with my B-26,which is ready for deployment.

I also have the P-61. :P On mine, the tail booms were spread apart (the stab is slightly too big) and so I had to fix that along with all the other typical Dynam issues. I also reinforced the booms. And repainted it. I posted my adventure and some pics on the P61 thread. I only got to fly it once and then the weather closed in last fall. So I am anxious for spring!

[Mrdronenut]

Gotcha MD. I saw on "in my hanger.......p-61 coming soon". I just posted pics of my P-61 on that thread,or should I say,the problems with it

[themudduck]

Gotcha MD. I saw on "in my hanger.......p-61 coming soon". I just posted pics of my P-61 on that thread,or should I say,the problems with it

LOL - I need to fix that. When I try to edit the siggy it tells me I've exceeded the number of characters, even when I am reducing it... so I have no idea.

[Mrdronenut]

Oh Boy!!!
Big,tubby,snappy,bird!!!! She is very,very "unpredictable"to say to very least. I maidens her yesterday,with the help of my friend,Jason Pepper,who is a very,very seasoned pilot.
All control surfaces @neutral. H/R @70%,L/R @50%,30% expo all the way around. I used a 3200,4s battery.
No problem with the elevator,Altho I did not shim it. But,when doing a loop,snap rolled w/o warning,like we were told.Does not land easy. Just about everything everyone has said about this plane is true,except the elevator problems. But,that being said,every plane out there is,l9ke I like to call IT,"exactly different".

[xviper]

This is a plane that is hard to fly "scale". It needs to be flown at higher throttle and higher speeds. IMO, it's a little under powered so trying to fly it slow can cause it to be too close to it's stall characteristics. Doing a loop that is too small and starting off too slow is not in this plane's nature. Big loops starting off with good speed and a little bit of a dive is the best way to do it without it snapping. Also, when it "snaps" too easily, this may be an indication that the 2 elevator sides aren't where they ought to be. Which way did it snap? If it snapped to the right, then the right elevator needs to be manually trimmed down a bit and/or the left one trimmed up a bit. If it snaps to the left, then the opposite. They may not look even when adjusted properly but if you like to do loops, that's the way they need to be. Mine only ever snapped once on the first loop. Then I figure out that it has to be done at speed and not too small a loop. It's never done it since and I never adjusted the elevators. Doing a big loop gives me time to compensate for any rolling tendency.
Nevertheless, the "scale police" will scream at us for even doing loops in this plane because it's not what the "real" one ever did, but I don't care, I fly my planes in whatever way it will let me.

[Mrdronenut]

This is a plane that is hard to fly "scale". It needs to be flown at higher throttle and higher speeds. IMO, it's a little under powered so trying to fly it slow can cause it to be too close to it's stall characteristics. Doing a loop that is too small and starting off too slow is not in this plane's nature. Big loops starting off with good speed and a little bit of a dive is the best way to do it without it snapping. Also, when it "snaps" too easily, this may be an indication that the 2 elevator sides aren't where they ought to be. Which way did it snap? If it snapped to the right, then the right elevator needs to be manually trimmed down a bit and/or the left one trimmed up a bit. If it snaps to the left, then the opposite. They may not look even when adjusted properly but if you like to do loops, that's the way they need to be. Mine only ever snapped once on the first loop. Then I figure out that it has to be done at speed and not too small a loop. It's never done it since and I never adjusted the elevators. Doing a big loop gives me time to compensate for any rolling tendency.
Nevertheless, the "scale police" will scream at us for even doing loops in this plane because it's not what the "real" one ever did, but I don't care, I fly my planes in whatever way it will let me.

Thanks "X". I'm not the scale police,but,since I've only been flying planes now for just over a year,I do fly scale. My buddy that did the 1s1st flight can fly anything and everything. He owns planes u could sit a 5yr old in. So when he had trouble,it's pretty bad.lol. It snapped right,so I'll check the elevator.
And you are right,it has to fly w/loads of throttle,and does need re-powering. We had just maidens my Flightline P38L,so,after that,everything seemed slow!!! Lol

[borntoolate]

Thanks "X". I'm not the scale police,but,since I've only been flying planes now for just over a year,I do fly scale. My buddy that did the 1s1st flight can fly anything and everything. He owns planes u could sit a 5yr old in. So when he had trouble,it's pretty bad.lol. It snapped right,so I'll check the elevator.
And you are right,it has to fly w/loads of throttle,and does need re-powering. We had just maidens my Flightline P38L,so,after that,everything seemed slow!!! Lol

This is why I replaced both B-26's with 11Hobby Bearcat motors. Flying at near full throttle just to stay in the air was not a good way to fly. Now half throttle is more than sufficient to fly well.

Bob

[themudduck]

Thanks "X". I'm not the scale police,but,since I've only been flying planes now for just over a year,I do fly scale. My buddy that did the 1s1st flight can fly anything and everything. He owns planes u could sit a 5yr old in. So when he had trouble,it's pretty bad.lol. It snapped right,so I'll check the elevator.
And you are right,it has to fly w/loads of throttle,and does need re-powering. We had just maidens my Flightline P38L,so,after that,everything seemed slow!!! Lol

Well I will pipe in.. my maiden flight was extremely hairy, mine snapped just pulling elevator through a normal turn. (I'm an instructor at my club so I fly everyone else's planes, so I'm used to weird things happening during the first flight!). Luckily I was high enough to recover.

This model has a high wing loading, a lot like the real plane. Its also short-coupled, so its very sensitive to the elevator. And, it was tail-heavy! There was a huge amount of discussion about this plane earlier in this thread... like many others, I found that it was necessary to have about 3-4 mm of "up" elevator trim for level flight, even when correctly balanced. Through more testing, we discovered that shimming the TE of the entire stab UP a few mm meant that you could fly the plane level with a neutral elevator. This change also helped make the plane fly better, And, cutting the amount of elevator throw down is also really very helpful. Less elevator throw calms things down and its much less likely to snap.

I like flying scale as well. With these modifications, the model behaves itself much better. mine doesn't snap, unless I make it snap on purpose (and it snaps like an S.O.B.!!!). I don't have any problem landing or taking off, or flying at low speed - when I use the flaps. I use 1/2 flaps for low speed, and full flaps on final approach, always.

I've posted this before, its a video I made demonstrating the way mine snaps!

[Papy58]

Hi guys, A small report from a Frenchy. I made my first flight on B26 this afternoon, after using the elevator's modification, remove the lead into the tail and back the battery (5000 mAh 4S) just behind the second strap. Take off was a formality. The B26 should not be too slow, but with the flaps completely down, the landing is very easy. Four flights without problems, a good afternoon under the sun. @+ Papy58

[Builda]

This is why I replaced both B-26's with 11Hobby Bearcat motors. Flying at near full throttle just to stay in the air was not a good way to fly. Now half throttle is more than sufficient to fly well.

Bob

Were they a "bolt in" fit or did you have to replace ESC's and change the motor mounts? Am curious for reference. I've asked Dynam (factory) to replace my center wing section with a PROPERLY assembled one (I don't mind paying a little towards it, but given all the issues everywhere else I expect a decent discount (I guess I'm fortunate I can deal with the factory like this). I'm really not sure what to do about the hunk of steel that was supposed to be glued in the tail somewhere. I might just leave it out and see how she flies. I'm going to stick an incidence meter on it too and see what the deal is with the tail cause it might not have a problem without that hunk of steel in the back? I guess we will see. As for my FMS F7F I decided to order a Hobbyeagle flight stabiliser for it which I will set up to only come on (in Horizon mode) when the gear is down (I don't like flight stabilisers, but if you have seen XJet's videos at tokoroa you will know we get a bitch of a crosswind there, so I'm not chancing it. I was hoping to have it flying this summer but I've had so many other planes to build etc I have yet to get to it-will be a busy winter if the weather is anything like last years.

[borntoolate]

Were they a "bolt in" fit or did you have to replace ESC's and change the motor mounts? Am curious for reference. I've asked Dynam (factory) to replace my center wing section with a PROPERLY assembled one (I don't mind paying a little towards it, but given all the issues everywhere else I expect a decent discount (I guess I'm fortunate I can deal with the factory like this). I'm really not sure what to do about the hunk of steel that was supposed to be glued in the tail somewhere. I might just leave it out and see how she flies. I'm going to stick an incidence meter on it too and see what the deal is with the tail cause it might not have a problem without that hunk of steel in the back? I guess we will see. As for my FMS F7F I decided to order a Hobbyeagle flight stabiliser for it which I will set up to only come on (in Horizon mode) when the gear is down (I don't like flight stabilisers, but if you have seen XJet's videos at tokoroa you will know we get a bitch of a crosswind there, so I'm not chancing it. I was hoping to have it flying this summer but I've had so many other planes to build etc I have yet to get to it-will be a busy winter if the weather is anything like last years.

The 11Hobby motors were nearly a drop-in fit. The stock X mount was a close fit. I did need to slightly open the holes in the X mount - but just slightly. I did change the ESC's to new 60 amp units. I was able to use the stock propellers as well.

Bob