Official Dynam 1500mm B-26 Marauder Thread

[TiredIronGRB]

Looks great Bob, are those Mustang wheels on the mains?

[borntoolate]

Looks great Bob, are those Mustang wheels on the mains?

Yessir. It is what I had at the time. I have the Robarts now and will probably change.

Bob

[TiredIronGRB]

Yessir. It is what I had at the time. I have the Robarts now and will probably change.

Bob

I like them, I used them on my HK C-47s.

[themudduck]

I like the way your model looks Bob, really nice job!

[borntoolate]

I like the way your model looks Bob, really nice job!

Thanks themudduck!

Bob

[themudduck]

Had some nice flights this evening. I asked a friend to take some video using my phone, then I stitched them together and uploaded it to YouTube. Turned out pretty decent I think.
This was at a short-cut grass field that I fly out of on Sunday evenings.

I really wanted to demonstrate how this bird will snap-roll. It rotates faster than some gas-powered stunt planes that I've competed with. Its so violent that I'm surprised the battery doesn't jump right out of the plane. But it only does this when I force it to do it, with full aileron + elevator + rudder all at the same time.

With reduced elevator throw and the shim installed, it won't snap during normal flight (I did have that problem during my maiden flight however!). The first flight shows a snap into a spin from high altitude, the second flight shows a snap from level flight.

I'm not super-proud of the landings on this video. During other flights I have been able to slow it down considerably, and float in. This time I had absolutely no wind to help. Flaps were down. but on the first landing it didn't flare and I kind of crammed it into the ground (3-pt carrier landing). On the second one I got the nose up and it was a little better. Anyway ... see what you think. Not so bad.


https://youtu.be/Y5WWh5q2xvI

[rifleman_btx]

Looked good to me. And seemed like it wanted to float longer than you wanted. Like mine did

[borntoolate]

Nice flights and video.

Bob

[Bigrc2]

Thanks themudduck!

Bob

Unusual paint scheme. Nothing like having the only one like it. Good luck flying her. Mine is standing down waiting for Robart 2 3/4" mains. Hoping for this Friday. Do a vid and post, please.

[borntoolate]

Good morning, Brent! I have 3" mains from Robart, I just have not installed them yet. I need to configure the Lemon Plus receiver before the maiden.

Bob

[themudduck]

I sent a note into MRC tech support yesterday and they've fixed the pictures for some of the spare parts that were mixed up.
I'm not saying it was because of me, but I am grateful for their quick response ! Good job.

I was asked to leave a review on the reverse prop. So I did. I considered it a challenge... :Smoking:

[TiredIronGRB]

I sent a note into MRC tech support yesterday and they've fixed the pictures for some of the spare parts that were mixed up.
I'm not saying it was because of me, but I am grateful for their quick response ! Good job.

I was asked to leave a review on the reverse prop. So I did. I considered it a challenge... :Smoking:

Geez, then I ordered the wrong parts.

[CFIT rob]

Have a 9 flights total, 1st flight nose heavy at 55mm took most of my ELE trim to fly level (pucker flight!). 2nd flight 60mm, much better except stbd main stuck half retracted (more pucker..could've made a diamond on that landing if you get my drift) ,contacted motion (still in that 30day window). Had one tail heavy flight (probably about 70mm) when i switched to lighter 3700 mh batt, dragged the tail thru the turns, wanted to climb,felt unstable. At 65 mm this thing is a sweetheart. Stable,lands easy,flys half throttle,flys beautifully and 8 to 10 min flights on 4000mah. I removed the lead in tail but had to replaced one to get my roaring top 3700 45c to cg without battery interfering with hatch. Highly recommend following alphas advice on this forum and watching ryans build video. A great flying airplane but very sensitive to cg.

[themudduck]

CFIT rob - just curious, did you include the stabilizer modification (shimming the TE up by 2-3 mm)?
Mine balances at 55mm with zero elevator trim needed (I did the mod, and removed the weights) and it flies perfectly. I am getting 8 minute flights with my 3600 battery, with 3.8 volts per cell remaining..

[xviper]

Have a 9 flights total, 1st flight nose heavy at 55mm took most of my ELE trim to fly level (pucker flight!). 2nd flight 60mm, much better except stbd main stuck half retracted (more pucker..could've made a diamond on that landing if you get my drift) ,contacted motion (still in that 30day window). Had one tail heavy flight (probably about 70mm) when i switched to lighter 3700 mh batt, dragged the tail thru the turns, wanted to climb,felt unstable. At 65 mm this thing is a sweetheart. Stable,lands easy,flys half throttle,flys beautifully and 8 to 10 min flights on 4000mah. I removed the lead in tail but had to replaced one to get my roaring top 3700 45c to cg without battery interfering with hatch. Highly recommend following alphas advice on this forum and watching ryans build video. A great flying airplane but very sensitive to cg.

It may not be "nose heavy". Without putting in that spacer in the horizontal tail surface, it may just need that much UP elevator to fly due to incorrect tail surface incident. It may not even be sensitive to CG changes. As you have already discovered, it flies really well as is. In my last video posted here, you can see how much UP I've got on mine at the beginning and flies very well. I'm going to leave it as is. If you're not going to do the spacer mod, set trim back to neutral and manually adjust the elevator to look like it does when it flies well.
The retract may have stuck due to the large tires getting caught on the plastic wheel well cover. Mine did and I just bent the strut the other way a little and it's fine. After a few runs on the rough grass, it got bent slightly. I may go to a narrower tire later and that will eliminate that problem. I'm finding my big, fat tires are starting to wear out anyway.

[CFIT rob]

Good point on the maiden up trim. Started with 1mm up. 2mm was recomended. Two more mm up was a lot of clicks. I am going to do the incedence shim mod after a few more gear up flights. I did trim the wheel well opening before flight as they had the wheel well off center. The main rubbed it on the first deployment. Something is stripped in the retract..it is making an unpleasant noise and shuddering( kinda like my exwife when a new box was on the porch). God love motion rc. A replacement is already on the way. If only they could have done that with the ex.

[themudduck]

..it is making an unpleasant noise and shuddering( kinda like my exwife when a new box was on the porch).

ahhh, HAHAHAHA :bluetongue:Win: you made me snort my coffee...

[rifleman_btx]

Lmao I know your pain with the ex. All too well.

[zrooster99]

Had some nice flights this evening. I asked a friend to take some video using my phone, then I stitched them together and uploaded it to YouTube. Turned out pretty decent I think.
This was at a short-cut grass field that I fly out of on Sunday evenings.

I really wanted to demonstrate how this bird will snap-roll. It rotates faster than some gas-powered stunt planes that I've competed with. Its so violent that I'm surprised the battery doesn't jump right out of the plane. But it only does this when I force it to do it, with full aileron + elevator + rudder all at the same time.

With reduced elevator throw and the shim installed, it won't snap during normal flight (I did have that problem during my maiden flight however!). The first flight shows a snap into a spin from high altitude, the second flight shows a snap from level flight.

I'm not super-proud of the landings on this video. During other flights I have been able to slow it down considerably, and float in. This time I had absolutely no wind to help. Flaps were down. but on the first landing it didn't flare and I kind of crammed it into the ground (3-pt carrier landing). On the second one I got the nose up and it was a little better. Anyway ... see what you think. Not so bad.


https://youtu.be/Y5WWh5q2xvI

Curious. Did you have to recover it from the spin, or just neutralize the controls and let it fly out?

[themudduck]

Curious. Did you have to recover it from the spin, or just neutralize the controls and let it fly out?

The snap-roll and the spin maneuvers were started by applying full rudder, aileron, and elevator. I released all three back to neutral, then the plane returned to normal flight immediately.
Of course to recover from the spin, then you have to pull out gradually.