Scratch built CG question

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aileron37 - 24 Feb 2010 18:36 GMT

Hello Guys, I have a scratch built design of mine, however I cannot
get it to string test for proper CG (I think the fins are in the way)
any ideas? Is there a rocket out there that looks similar I can use as
a guide? Its ready to go except for the finish. If all else fails I
may do few test flights before painting to figure out the balance.

It can be seen here http://aileron37.blogspot.com/2010/02/scratch-built-called-trident.html

Thanks all
rick

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Chris Eilbeck - 24 Feb 2010 18:48 GMT

> Hello Guys, I have a scratch built design of mine, however I cannot
> get it to string test for proper CG (I think the fins are in the way)
[quoted text clipped - 3 lines]
>
> It can be seen here http://aileron37.blogspot.com/2010/02/scratch-built-called-trident.html

Just lob it, it'll be fine.

Chris

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Chris Eilbeck
MARS Flight Crew http://www.mars.org.uk/
UKRA #1108 Level 2 UYB
Tripoli UK Member #9527 LSMR

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Roland - 24 Feb 2010 20:15 GMT

aileron37 schreef:

> Hello Guys, I have a scratch built design of mine, however I cannot
> get it to string test for proper CG (I think the fins are in the way)
[quoted text clipped - 6 lines]
> Thanks all
> rick

It will fly. Looks like you can use an a8-3 for the first flight. Check
the lift off weight first, of course to make sure it's ok.

If you want to know the location of the CG use a piece of ducttape to
tape the string directly to tube instead of having it go around the
bodytube.

Roland

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lektric.dan@gmail.com - 25 Feb 2010 07:52 GMT

> Hello Guys, I have a scratch built design of mine, however I cannot
> get it to string test for proper CG (I think the fins are in the way)
> any ideas? Is there a rocket out there that looks similar I can use as
> a guide? Its ready to go except for the finish. If all else fails I
> may do few test flights before painting to figure out the balance.

Use a piece of string on a bit of tape. You can always add a bit of
nose weight. The design looks fine though, everything is where it
should be; no large canards.

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Model Forum / General / Rockets / February 2010

Scratch built CG question