orthobird

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Rob, I just weighed it, 43 pounds

i did have to add 4 pounds to the nose to get her to balance. otherwise, 39 pounds. I am going to look up your weight to see how close I am to yours.

orthobird

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ok Rob, i see your was between 47 and 48 pounds.

What a dilemma!

mine is heavy, i think.

this is what I had to do:



purchased this from the local SCUBA diving shop/

i got several 1,2, and 3 pound lead weights.

I made this tray so that the weights can be fixed to the plywood tray.

this is the front end of the aircraft. Black zip ties. this is the area between the front former and the firewall for the DA 100 inline. I used a single 3 pound weight plus a 1 pound weight.

White Rose propeller washer, 6.6 ounces

it is balanced at the 6" mark with 4 pounds.

6" mark from root, using the EZ balancer

orthobird

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some interesting facts:
KOLM 230 inline, 3 cylinder = weight = 7770 grams = 17.12 pounds
DA 100 inline twin = 6.9 pounds

orthobird

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Got her up on the ground for the 1st time:





















and here is a video of the 1st start up....

orthobird

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turns out my CG calculations were all wrong. I was measuring the CG way too forward, and thus, I made the airplane way nose heavy.

I shifted the CG, and now it is about 3/4" forward of the leading edge of the wing tube.

I removed all of the scuba diving weights, and then some more. Also removed the propeller washer.

the airplane weighs 38.5 pounds.

waiting on building up the nerves to do the maiden.

orthobird

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I also have run the motor on the ground and the baffling works great.

Temp A is the forward cylinder and Temp B is the rear cylinder.

GR8R8

What’s everyone using on the gear doors? Micro servo, linear servo/actuator? I like the look of the linear servos, but they all seem to be limited to 6v..

orthobird

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i used a standard HV servo , high torque

had to get creative in the area to install