Official Dynam 1500mm B-26 Marauder Thread

[rifleman_btx]

Very cool, what may I ask is your all up weight?

[TiredIronGRB]

I must say I'm really loving this plane, I'm getting 12 minutes on the new Admiral 4S 4000s. She is very well behaved and landings are very predictable...and she just looks awesome!

[rifleman_btx]

Well my parts made it in time. Ready to fly tomorrow just a 1/4 lb under the manual weight with the 5000 and 1/2 lb under with the 4000.

[xviper]

Very cool, what may I ask is your all up weight?

I've never weighed any of my planes so can't say.

[xviper]

OK, just put mine on a luggage scale. With the weights in the tail present, no battery, it weighs in at 4.85 lb. Add another 0.94 lb. for my 4000mah, 4s battery and you've got the total weight of 5.79 lb.

[rifleman_btx]

Oh goodness, now I see why the planes fly like lead bricks and need so much power to keep flying!

[handyman220]

I did the same mod as borntolate to get my top hatch fitting correctly. All it takes is a few minutes and a sharp razor. I'll relocate the magnets to pull the front of the hatch to fit better.

[themudduck]

I had a few more nice flights today on mine - I tried out a few things (as I mentioned in a previous post):
a) I removed the tail weights
b) I adjusted the incidence of the stab, lowering the LE about 1/16 inch.
c) I tried using a 3600mah battery instead of the 4000.

Total weight with the 3600 battery: 5 lbs 10oz (5.625lbs)

I played with the balance a bit, moving the battery forward bit by bit. My original balance point was 60mm back from the LE. After three flights now I have it set at 55mm and it seems to be very close to where it should be.
The front edge of the battery is about 1.25 inches in front of the edge of the strap.

Testing the CG - With the balance point at 60mm, I flew the plane into a 45-degree up-line and released the stick, and the model continued to rotate towards vertical (indicating tail heavy)
At 55mm, did the same thing and the model held the line (indicating its close to correct)

I can still force a snap-roll if I try very hard, but it is much better than before. I've reduced the elevator throw to just a little under 1/2 inch. It flies wonderfully.
I've had no problems at all at low speed with tip-stalling but I use flaps.
After a 5.5 minute flight the battery read 3.92 volts per cell (same as the 4000).

[rifleman_btx]

I don't understand why y'all have such heavy birds compared to mine. Almost a full lb heavier.

[xviper]

I don't understand why y'all have such heavy birds compared to mine. Almost a full lb heavier.

Might be variation in the type of scale you're using. 1 lb on a bathroom scale is not a significant error.

[ryramZ]

I had a few more nice flights today on mine - I tried out a few things (as I mentioned in a previous post):
a) I removed the tail weights
b) I adjusted the incidence of the stab, lowering the LE about 1/16 inch.
c) I tried using a 3600mah battery instead of the 4000.

Total weight with the 3600 battery: 5 lbs 10oz (5.625lbs)

I played with the balance a bit, moving the battery forward bit by bit. My original balance point was 60mm back from the LE. After three flights now I have it set at 55mm and it seems to be very close to where it should be.
The front edge of the battery is about 1.25 inches in front of the edge of the strap.

Testing the CG - With the balance point at 60mm, I flew the plane into a 45-degree up-line and released the stick, and the model continued to rotate towards vertical (indicating tail heavy)
At 55mm, did the same thing and the model held the line (indicating its close to correct)

I can still force a snap-roll if I try very hard, but it is much better than before. I've reduced the elevator throw to just a little under 1/2 inch. It flies wonderfully.
I've had no problems at all at low speed with tip-stalling but I use flaps.
After a 5.5 minute flight the battery read 3.92 volts per cell (same as the 4000).

How is your elevator neutral? Any uptrim?
Straight and level at speed what happens?

[rifleman_btx]

Might be variation in the type of scale you're using. 1 lb on a bathroom scale is not a significant error.

Could be, I ran it up on two scales just to be safe. Both the fishing scale and the bathroom scale came up the same

[rifleman_btx]

I had a few more nice flights today on mine - I tried out a few things (as I mentioned in a previous post):
a) I removed the tail weights
b) I adjusted the incidence of the stab, lowering the LE about 1/16 inch.
c) I tried using a 3600mah battery instead of the 4000.

Total weight with the 3600 battery: 5 lbs 10oz (5.625lbs)

I played with the balance a bit, moving the battery forward bit by bit. My original balance point was 60mm back from the LE. After three flights now I have it set at 55mm and it seems to be very close to where it should be.
The front edge of the battery is about 1.25 inches in front of the edge of the strap.

Testing the CG - With the balance point at 60mm, I flew the plane into a 45-degree up-line and released the stick, and the model continued to rotate towards vertical (indicating tail heavy)
At 55mm, did the same thing and the model held the line (indicating its close to correct)

I can still force a snap-roll if I try very hard, but it is much better than before. I've reduced the elevator throw to just a little under 1/2 inch. It flies wonderfully.
I've had no problems at all at low speed with tip-stalling but I use flaps.
After a 5.5 minute flight the battery read 3.92 volts per cell (same as the 4000).

So, we have to push it up even closer to the LE of the main wing?

[rifleman_btx]

Ok I put mine at 55 as well.

[rifleman_btx]

Redid it, realized my mistake on the first run. have to reconfigure my battery placement marks

[handyman220]

Added magnets to the front of the top hatch, it is sitting much better now. I printed out the nose graphic and painted the cockpit. Now I can get things assembled, shouldn't take long at all.:Cool:

[quitcherbitchen]

@ themducks I have an incidence meter. When I put mine together I will check the horizontal incidence.

[rifleman_btx]

We shall see how it goes today

[Hardway]

Good luck Bro!!!! Take it easy and fly fast!!! :-)

[rifleman_btx]

Rgr that