Official Dynam 1500mm B-26 Marauder Thread

[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

[Papy58]

Hi borntoolate,
Did you measure the engine consumption? The original controller of F8F bearcat is a 40A. Papy58

[Papy58]

the B26 propellers are slightly larger (10.5x8x4 for 10x7.5x4).

[borntoolate]

Hi borntoolate,
Did you measure the engine consumption? The original controller of F8F bearcat is a 40A. Papy58

Hi Papy58. I am sorry, I did not. Most, or all, of my motor/esc stuff is farmed out to a buddy who is very knowledgeable in that area. I tell him what I want/have and he recommends a course of action for me. I figured the 60amp ESC's would add a little safety in the mix for me. I just had some new ESC's on hand and I am not overly pleased with Dynam equipment. (retracts, ESC's)

Bob

[borntoolate]

My B-26 had an unfortunate mishap about a month ago. Since I needed to repair the fuselage anyway, I opted to modify the bomb bay to a newer version. Thanks to Quitcherbitchen's advice, I decided to move the rudder and elevator servos further aft. I ended up moving them about 10 inches (254mm) back towards the tail. The allowed me to gut the bomb bay area under the wings. I could have fit 4 or 5 "Adam Bombs" in a free fall (when the doors opened) or 2 "Adam Bombs" with a bomb drop device. I already have a B-17 that will drop 4 or 5 bombs so I went with the toggle device. I am not finished but I took some pics of the progress so far if anyone is interested. I would also like to give credit to Tom Hunt. His bomb bay design for the B-17 inspired me in regards to the toggle device. Thanks Tom and Adam!

Bob

[CFIT rob]

Love the bomb bay bomber bob. Thats my next upgrade. For those new to the b26 and dynam, the fit/finish often requires modification to turn into a more "model scale". Beacon foam filler and a paint job can go a long way in covering up these issues. Mine is totally stock with the only non-cosmetic mod being improving the wing bolt mounts with a little ply. Weights in the tail,elevator 3mm up. It flies great, lands easy,and even at 3/4 throttle i get 9min of safe flight with a few in reserve. (4000ma 30c chinahobby line). Mine is the one of the pre-order first batch. The gear is a problem in cold weather (my third batch p-61 does not have the issue). Its worth the money. Even with the dynam quirks. Finger shows my CG with gear down. Foil is 338012x12 ,6 per pack alum foil tape from amazon.

[borntoolate]

Love the bomb bay bomber bob. Thats my next upgrade. For those new to the b26 and dynam, the fit/finish often requires modification to turn into a more "model scale". Beacon foam filler and a paint job can go a long way in covering up these issues. Mine is totally stock with the only non-cosmetic mod being improving the wing bolt mounts with a little ply. Weights in the tail,elevator 3mm up. It flies great, lands easy,and even at 3/4 throttle i get 9min of safe flight with a few in reserve. (4000ma 30c chinahobby line). Mine is the one of the pre-order first batch. The gear is a problem in cold weather (my third batch p-61 does not have the issue). Its worth the money. Even with the dynam quirks. Finger shows my CG with gear down. Foil is 338012x12 ,6 per pack alum foil tape from amazon.

Thanks, CFIT rob! You are correct - with a little bit of tweaking and some cosmetic work, these Dynam planes can be really nice flyers.

Bob

[Builda]

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

Thanks Bob. I haven't looked at my B26 to see (at the time of writing this), but were you able to swap the ESC's without removing the Nacelles from the center wing section?

[borntoolate]

Thanks Bob. I haven't looked at my B26 to see (at the time of writing this), but were you able to swap the ESC's without removing the Nacelles from the center wing section?

If I remember correctly, I was able to get the ESCs out but we did remove the nacelles to replace the stock ESC's as the 60 amp ESC's had a different gauge wire. It was not really difficult as the nacelles are glued on and with some steady pressure we were able to separate them from the wing section.


Bob

[Phantom]

I currently fly a multi-engine turbo prop STOL aircraft that incorporates aerodynamic/geometric wing twist along with wing fences to ensure a nose first drop wings level stall characteristics. It is almost impossible to have a wingtip stall, short of getting myself into VMCA. Has anyone played with modifying the leading edge of the outer 1/3 of the wings on this bird.... because I am about to start... I thinking of using some extra wing fences from a Delta Ray. Then either add to or change the angle of incidence on the outer one third of the leading edge,... just brainstorming...