New Products Flash Sale
Thread Tools
Old Aug 28, 2012, 12:54 PM
IFLYOS is offline
Find More Posts by IFLYOS
14s 180mah should be enough...
IFLYOS's Avatar
United States, NC, Pfafftown
Joined Feb 2001
4,042 Posts
Need a "Rule of thumb"

On prop position vs CG, as well as cg in ballasting the kite for "free flight" test glides still valid?

I would guess that the prop position would change as a percentage of the chord depending on the type of kite...but I am not sure.

A buddy and I got out first vector unit together this weekend, and had a flight, though it wasn't 100% successful. We told the onlookers that "we are still in the development stage" to save face

So...any advice? We are not locked into a specific kite type, so if one is better than the other (delta. delta box, etc) we can change as needed...

IFLYOS is offline Find More Posts by IFLYOS
RCG Plus Member
Latest blog entry: Intro..a few years to late!
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 29, 2012, 10:52 AM
slebetman is offline
Find More Posts by slebetman
Registered User
slebetman's Avatar
Malaysia, Selangor, Kajang
Joined Jun 2009
1,619 Posts
I've always determined CG with glide tests for all my kites. So yes, it's valid.

However, I've found that kites with long wingspans and short body like bird kites to be harder to trim than kites with short wingspans and long bodies like deltas and box kites.

Kites with a lot of cloth in front of the CG usually need a tail to improve lateral and spiral stability. Sort of like the rule with planes and the size of vertical stabilizers.

So far I've never been able to trim kites with pusher configuration though it should be possible given that people have built RC ultralights. Having the prop in front of the CG is easier to trim in my experience.
slebetman is offline Find More Posts by slebetman
Last edited by slebetman; Aug 29, 2012 at 10:59 AM.
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion rule of thumb for kv of motor needed for wing? Nethole Flying Wings 6 Oct 27, 2006 01:21 PM
Discussion need rules of thumb birdofplay Electric Motor Design and Construction 16 Mar 02, 2006 04:53 PM
confused..need watts vs weight rule of thumb please Wayner Power Systems 12 Dec 12, 2005 08:20 PM
Rule of Thumb? Fast Fly Sport Planes 3 Oct 09, 2001 11:01 AM
Rule of Thumbs..... LuckyArmpit Foamies (Kits) 1 Sep 30, 2001 09:00 PM