Eagler's Nest

Airframes => Single Seaters => XL => Topic started by: glenn woloski on November 01, 2020, 09:57:52 PM

Title: XL center of gravity
Post by: glenn woloski on November 01, 2020, 09:57:52 PM
I'm waiting patiently waiting for my plans to arrive, but thinking ahead.....How well does the CG come out when building this design, and at what stage would you want to do a mock up to see if any major adjustments need to be made so that weight doesn t need to be added?
I'm also going to use a three cylinder Suzuki engine so I will have to consider engine placement to achieve CG.
Is there a known CG of the fuselage alone, that will, when the wings and tail are installed bring the final CG to the correct location?
Thanks , Glenn
Title: Re: XL center of gravity
Post by: Chuck in Indiana on November 03, 2020, 09:00:31 AM
Les homan posted a weight and balance for his "light" Verner powered Legal Eagle.
It's in here..
https://legaleagleflyingadventures.com/
If your proposed engine is in the ball park (about 80 lbs.) it should be instructive.
Title: Re: XL center of gravity
Post by: Richard Riddick on December 17, 2023, 06:46:14 AM
Hi Gentlemen; New builder awaiting plans. ON CG. Much talk about safety cable to maintain cg if broken prop causes engine to depart. Someday I might do a sample cg calculation with all the engine weight moved back to the firewall. I wouldn't be surprised that the aircraft will still be uncontrollable. Anyone already done this or have thoughts?
Thanks
Title: Re: XL center of gravity
Post by: Dan_ on December 17, 2023, 09:49:39 PM
Someday I might do a sample cg calculation with all the engine weight moved back to the firewall. I wouldn't be surprised that the aircraft will still be uncontrollable. Anyone already done this or have thoughts?
Attached is a screen shot of Les Homan's cable with the full case. 

You have the right idea about it...  Differnt cats have to be skint differ
nt however.

It was a rule in formula Vee.  Noe cable, noe pass tech inspection...  That PDF should be in the files section.

They had to wrap the much longer cable around all 4 jugs.
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