RC Flying Christmas Tree - RC Groups
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Dec 07, 2012, 06:39 PM
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RC Flying Christmas Tree

Hi guys.

anyone know how to find out (Easily!), the C of G of a Flying Christmas Tree?
Basically just a delta, set up with Elevons, but I'd rather it didn't plummet groundwards on its maiden flight.
is there an easy idiot proof way of figuring out where the C of G should be on a scratch built delta?
I've seen plenty of youtube videos of these flying, but none go into any detail about the C of G!
It's built, and power system is up and running (front mounted prop), but I've held off placing the battery, until I have some idea of where it needs to go!

Any help would be great!

Thanks in advance.

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Dec 07, 2012, 06:42 PM
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jetcommander's Avatar
This one might do the job and you can save an image of the worked out data, in the window at the top put 15% CG for beginners and play safe. Donīt forget the lights on the tree.

Dec 07, 2012, 06:48 PM
Registered User

I'm not very bright!!!

looks like the sort of thing I'm after, but I've not got the first clue how to go about putting in the necessary data!!

I can do length and span at the widest point (Back!!) but that's about it!!
Dec 07, 2012, 08:57 PM
Wake up, feel pulse, be happy!
Piece's Avatar
This calculator is a little simpler to use. It's pretty self-explanatory, too.
Dec 08, 2012, 06:46 AM
Registered User
thank you for this. I'll give it a go!!
Dec 11, 2012, 03:24 AM
Registered User

It flies!!!

Many thanks to those who helped!
The C of G calculation charts helped no end.
The first flight was a pretty un eventful experience, as the tree sprang into the air like a Saturn five rocket! Went straight up, and performed a right hand turn as intended, then flew around for a minute or two, with a heave back on the stick as it approached me on its finals, pointed skywards, to be caught gracefully.
A little tail weight was added to assist with high Alfa passes (in an attempt to make it look a little tree like) with the nose pointing almost straight up!
Open the taps and it'll fly around like any other delta mix!
Now to add paint and the all important lights!!

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