Official Dynam 1500mm B-26 Marauder Thread

[themudduck]

Thank you to all who commented on my issues with my B-26. I synced the throttles after waiting on the two beeps, found and corrected a slightly drooping flap, shimmed the horizontal stabilizer 3mm at the rear and what a difference. It flies great. My second flight was night and day from the first. I had a blast flying it for almost 8 minutes before dropping full flaps and making a perfect landing. It is hard to believe that 3mm could make such a big difference in performance.

Hey there, its wonderful to hear your results (a great-flying plane), that's terrific news!
A lot of us have posted here about this (back in the olden days), but not everyone believes us! So now we have another confirmation.

Your turret mod is very interesting as well. Great job!

[AirHead]

I watched a doc on this plane and it was a handful. They had to land it at 100 MPH otherwise it would have big issues landing. I can totally relate to having to modify Dynam planes. I spent lots of time modifying Dynams, but those awful and unreliable Dynam retracts create anxiety when you don't know if they will work every time. It's a heavy plane and I don't know how many Motion really sells. Dynam doesn't have a problem going after different models though. I'm currently not flying, but when I get back, I'll wring out the Dynams....

[Mad Baron]

I'm planning a repaint on my B26 and what would be the best way to remove the turret?

[borntoolate]

I'm planning a repaint on my B26 and what would be the best way to remove the turret?

I did not remove the turret. I carefully taped around it.


Bob

[themudduck]

Its been a long time since I first got the plane, but I remember when I was fixing it up I tried unsuccessfully to get the turret off. So what I did was, I just pried off the plastic cover. Then I was able to re-mount the guns the way I wanted and touch up the paint.
I never did figure out how to get the whole turret off!

[Ah's Availble]

Hi Mad Baron,

On mine, I cut the fuselage along the invasion stripes on the co-pilot's side of the fuselage from top to the middle of the fuselage. I then removed that chunk of the fuselage. This exposes the slotted area that acts as a bearing surface for the flange at the bottom of the turret. The turret then slides/pops out. After putting it back and gluing it in place I used some Spackle (Thanks Pilot Ryan and Captain Mike for the tip) to smooth the joints and a little flat black and white to match the paint and she was ready to go. Suggest you check out my turret mod if you remove it. It was simple and looks cool when taxiing or just sitting on the flight line to see the turret rotate.....

[Saltydawg]

If you don't care about your gun turrent not rotating and don't want to cut a chunk out of your plane just cut straight down around it and glue it back on.

Also you could just tape the turrent and gun barrels.

[Tonydoright]

Reading through a bunch of data i like others had a completed B26 head straight south after take off. Recovered and landed be it rough. Did the shim and worked perfectly. My question today is deflection of flaps. Take off and landing degree. Can someone give some insight to how much to setup? Many thanks!!!

[themudduck]

Tonydoright, please explain what happened - "headed straight south" doesn't make it clear. The elevator on this model needs to be set up so it doesn't move much - no more than about 3/8 inch each way. You may have used too much control throw on the elevator, if it was very sensitive... but I don't know what you mean by "headed straight south".

The flaps prevent the plane from stalling at low speeds, they don't make the plane do anything odd. I used about 25% down for takeoff and 100% down for landing. ' Degrees? I don't know, maybe 20 degrees and 60 degrees...

[Tonydoright]

Sorry, on maiden flight just after what seemed to be normal take off with no flaps when the elevator stick was returned to neutral the airplane took a strong downward direction with no roll to right or left. I began adding trim and ran out before it got to level flight. I called Grayson and they sent me to this site which was an awesome fix and down right problem solving outcome. I used four mm block on the TE Of the horizontal. Took it back out and problem gone. The flaps are a concern as this is my first aircraft with them. Four landings all too hot and ugly. I have take off set at 20 degrees and landing at 50-60. When you say 100percent do you mean all that the servo will deliver? Do you deploy landing flaps at say half throttle and onto final approach? Appreciate the quick response great information shared by so many!

[Phantom]

Sorry, on maiden flight just after what seemed to be normal take off with no flaps when the elevator stick was returned to neutral the airplane took a strong downward direction with no roll to right or left. I began adding trim and ran out before it got to level flight. I called Grayson and they sent me to this site which was an awesome fix and down right problem solving outcome. I used four mm block on the TE Of the horizontal. Took it back out and problem gone. The flaps are a concern as this is my first aircraft with them. Four landings all too hot and ugly. I have take off set at 20 degrees and landing at 50-60. When you say 100percent do you mean all that the servo will deliver? Do you deploy landing flaps at say half throttle and onto final approach? Appreciate the quick response great information shared by so many!

Landing flaps are 100%, " all the servos can give you." On your downwind drop your gear and select takeoff flaps, your 20 degrees, throttle back enough to slow her down but not enough to descend, probably about 50%. This will help prevent "ballooning " due to your increased lift that your 20 degrees of flaps is providing you.

Once you feel like you've achieved the balance where you are using just enough throttle to maintain altitude, drop your landing flaps and adjust your pitch down to start your descent adjust your throttle down first then up if need be to control your constant rate of descent. Keep the slight nose down attitude because your flap setting and your slow turning props are actually producing drag, acting like speed brakes.

Once you are in ground effect, or about 1 to 1 1/2 wingspans height above your landing zone, relax pressure on your forward stick until the aircraft is level, her descent will slow at first, then when it starts to increase, slowly pitch the nose up while simultaneously creeping back on that little bit of power you still had in, and she'll touch down on the mains nice and gentle. Piece of cake 👍

[Tonydoright]

Nice, I feel like I'm being talked down from the tower. Well written advice. Ill apply this approach this weekend.

[Phantom]

Nice, I feel like I'm being talked down from the tower. Well written advice. Ill apply this approach this weekend.

Haha your welcome. This type of approach will work for just about any aircraft with the exception of delta wings, when you get a delta jet me know.

[Alpha]

Great advice, Phantom, thanks for providing it! Phantom Tower!

[Phantom]

Great advice, Phantom, thanks for providing it! Phantom Tower!

Haha glad I could help. Phantom Tower eh? Guess I missed my calling with ATC... but I'm happier in the cockpit!

[themudduck]

Hey Tony, the Phantom beat me to it... but he told the story... I use "takeoff flaps" for takeoff and then again on the setup for landing, then use full flaps (all that the servo can give) when I am on final approach. Keep a little throttle in and then cut it completely right before touchdown. I found that this model is very sensitive to elevator, so I limited the elevator throw. Don't slow it down too much - the real B26 was famous for hot landings.

Its curious what happened with your plane on the first flight. I've installed the shim to the TE of the stab (about 2-3 mm) and had no problem at all - but of course you also have to ensure that the model is balanced correctly. Anyway there's no point beating that topic up, if your model is flying well now everything else is pointless I guess. Hope you have fun with it!

Here's a video I made, showing the elevator throw and flap setting for takeoff. Just for the purpose of demonstration, two quick takeoffs and landings from a short grass field (the second landing has a nice bounce!) https://www.youtube.com/watch?v=Ds3McW7c-QA

[Phantom]

Hey Tony, the Phantom beat me to it... but he told the story... I use "takeoff flaps" for takeoff and then again on the setup for landing, then use full flaps (all that the servo can give) when I am on final approach. Keep a little throttle in and then cut it completely right before touchdown. I found that this model is very sensitive to elevator, so I limited the elevator throw. Don't slow it down too much - the real B26 was famous for hot landings.

Its curious what happened with your plane on the first flight. I've installed the shim to the TE of the stab (about 2-3 mm) and had no problem at all - but of course you also have to ensure that the model is balanced correctly. Anyway there's no point beating that topic up, if your model is flying well now everything else is pointless I guess. Hope you have fun with it!

Here's a video I made, showing the elevator throw and flap setting for takeoff. Just for the purpose of demonstration, two quick takeoffs and landings from a short grass field (the second landing has a nice bounce!) https://www.youtube.com/watch?v=Ds3McW7c-QA

Watching your video, I had forgotten how "hot" I used to land her, prior to my wing mod. Mudduck, I primarily use 4s 4000mah battery in mine, what do you fly her with?

[Tonydoright]

Thanks for the video, nothing like a visual.

[themudduck]

Watching your video, I had forgotten how "hot" I used to land her, prior to my wing mod. Mudduck, I primarily use 4s 4000mah battery in mine, what do you fly her with?

I've made better landings! ... but at the time I was just trying to show someone that this plane can handle grass. The grass helps it slow down on landing! So no problem.

I am using Admiral 3600mah 4-cell batteries.... plus no tail weight. My timer is set for 8 minutes but it can go longer than that.

[Phantom]

I've made better landings! ... but at the time I was just trying to show someone that this plane can handle grass. The grass helps it slow down on landing! So no problem.

I am using Admiral 3600mah 4-cell batteries.... plus no tail weight. My timer is set for 8 minutes but it can go longer than that.

I also removed the tail weights, and usually fly for 7 to 8 minutes. Was just curious about the size batteries some folks are using, and how the different weights have impacted their flight characteristics on this particular bird...