Official Dynam 1500mm B-26 Marauder Thread

[quitcherbitchen]

Stock collet adapter?

[borntoolate]

Stock collet adapter?

No sir. I am not a fan of collets at all. The 11 Hobby Bearcat motors have the stock bolt on prop adapters.

Bob

[quitcherbitchen]

Do they (the motors) directly fit the bolt pattern of the Dynam crapcheese motors? Also, does the flight time diminish? The Bearcat motors are higher KV. Be interesting to see the side by side comparison. Mine flies great once at altitude. Getting there is the hard part. Climb rate with a full load of babies in it's belly makes for long slow painful circles to altitude.

[borntoolate]

The bolt pattern are nearly identical. Not exact though. I was able to install 3 of the 4 bolts. The 4th was just slightly off. I will use a different X-mount on the silver B-26 for her upgrade. The green B-26 has not flown yet. I scheduled this weekend for the maiden and I will take both out for comparisons. I will post the data when the test flights are done.

[quitcherbitchen]

Thanks Bob

[Bearcat]

My second B-26 is now pretty much done. The prop tips have been painted yellow after these pics were taken. She is now ready to join her squadron mates from the 344th Bomb Group in missions at Apollo Field. She does have some mods from the stock plane - motors, ESCs, and landing gear.

Bob

I see my Valkyrie is being used more now..sweet!!!

[borntoolate]

The bolt pattern are nearly identical. Not exact though. I was able to install 3 of the 4 bolts. The 4th was just slightly off. I will use a different X-mount on the silver B-26 for her upgrade. The green B-26 has not flown yet. I scheduled this weekend for the maiden and I will take both out for comparisons. I will post the data when the test flights are done.

It appears that the scheduled maiden (s) will have to be rescheduled again - due to strong winds predicted. I am disappointed.

Bob

[rifleman_btx]

Dang that sucks

[borntoolate]

Yeah, predicted winds are ~17mph. I am not a fan of strong winds - especially for maidens. I will be watching the weather report closely and maybe if mother nature gives us a break, we can do the maidens.

Bob

[rifleman_btx]

Ouch! yes whole heartedly agree with that.

[quitcherbitchen]

What do you guys think if I change the battery to sit like this?

[fhhuber]

What do you guys think if I change the battery to sit like this?

Any way the battery fits that does not throw CG off is fine. (note that CG is a point in 3D space, not a line or plane through the model. It can be off up-down or side-side as well as fore-aft.)

If you moved it to aid getting correct CG without adding "dead lead" (or to reduce useless ballast) then you are doing exactly the right thing.

I commonly trim some foam to get the battery where I want it or to fit a larger battery. I'd much rather carry a larger battery than useless ballast.

[quitcherbitchen]

Good point FH, but I am doing it for three reasons. One, I hate the velcro straps, they were too far forward for me as I moved my servos to the rear bay and got rid of the tail weights. Two, the rats nest of wires always had to be moved in order to strap the battery. I think if I put in a foam battery bay I can route the wire thru the foam thus making any constant shuffling of wire almost unnecessary. Three, getting the weight in a more vertical plane will make the models vertical CG more centered. Less pendulum being down low. Might effect the roll rate and aileron throws. Right now, the rates seem kind of mushy, but that may just be my expo setting. I figure it is worth a try to make loading the battery easier.

[fhhuber]

moving cg vertically changes the axis of the roll and how much you have to work to hold straight knife edge.

distribution of the weight side-side or up-down affects roll rate (how crisply it can do 4 or 8 point rolls). More weight out toward the tips means its harder to start rolling and to stop rolling. The closer the heavy stuff is to the CG the sharper your points and corners will be when trying precision maneuvers.

Some planes this matters more than others. Scale bombers never were meant for precision aerobatics.

[quitcherbitchen]

So I didn’t go vertical, but I did use a ramp. Really easy to load the battery now

[borntoolate]

Since it is so windy today, I had time to work on the B-26s. The battery compartment was a mess with the wiring. so I made a simple cardboard divider to clean it up. Installing/removing the battery is quick and easy now. Cost - nothing. Time to mod - 5 minutes.

Bob

[rifleman_btx]

All I did was run the reciever under the wing, that really cleaned up mine.

[borntoolate]

This one has a bomb bay added. That may account for the wire mess, or the former wire mess!

Bob

[xviper]

Flew mine this morning after having it hang from the ceiling all winter. It reminded me of how wonderful this thing looks in the air. Greased every landing. I can't say that about most of my other planes.
I must admit, however, that those big, fat wheels are somewhat goofy looking. May have to mod them up later with skinnier ones.

[rifleman_btx]

The only one I swapped was the nose wheel. I might do the mains this year, maybe