I have purchased a Boomerang trainer from a friend who has misplaced the manual.
Anyone know what the CG should be?
Thanks,

Ray

G'day Mate,
Start at the main wing spar, that is a safe point, & adjust as required after flying.
Boomerangs are not that critical, as far as balance point is concerned.

No matter what the airplane, model or full size, if you have the need to "discover" the location of the CG range, get out your yardstick (for the model) and make 9 measurements. Plug them into this online application, and you'll have absolutely reliable information in about 10 minutes time:

http://www.geistware.com/rcmodeling/cg_super_calc.htm

Thanks for the help.
I will start at the spar and have bookmarked the calc page.
My brother should maiden his boomerang on monday.
Another victim for the addiction

What Boomerang, the only one I know of is the turbine trainer.

If its a Seagull Boomerang 40 then the balance point from the manual is 7.5 cm - 8.5 cm from the leading edge.

Cheers

Thanks for the numbers,

Yes, it is the Seagull Boomerang 40.
RCU to the rescue!