I have been also investigating belly board mounting and this what I've been thinking and what I intend to do, maybe? :-)
Most Gliders have their airbrakes at the CofG, mounting a belly board behind the CofG will induce a pitching motion when deployed. While everyone says that a belly board should be behind at or behind the CofG, I question this as we get an enormous amount of drag from the propeller when the engine is at idle and it's way out in front :-) The forces on the belly board will be half way between the pivot point and the actuators mounting point, assuming the actuator is mounted to the end of the belly board, which most aren't. Therefore it will be at some point in-between which can be calculated by someone smarter than me (angles, moments and stuff will affect where the centre of force is, too complex to consider for me) Also belly boards are out there already working mounted from 4" behind the front spar to behind the rear spar. >From above I intend to mount my belly board with the hinge at the centre of >the CofG range, but first I have to work out how, and where, to mount the >actuator. Comments Please Thanks Barry Kruyssen Cairns, Australia RAA 19-3873 k...@bigpond.com http://www.users.bigpond.com/kr2/kr2.htm ----- Original Message ----- From: Ralph H Snyder To: kr...@mylist.net Sent: Monday, May 30, 2005 5:21 PM Subject: Re: KR> Belly board mounting Mark I like the looks of your installation, but that would completely close off my luggage compartment behind the rear spar. I was thinking of mounting it between the 2 spars on a 1" x 2" reinforcement across the floor board. Could any one tell me if this will give me the strength that I will need to support the belly board? Ralph Snyder Burbank CA ralphnd...@juno.com On Sat, 28 May 2005 16:54:49 -0500 "flykr2s" <flyk...@wi.rr.com> writes: > Ralph, > Check out my system, It works perfect. You should really have it > mounted to > the rear spar for strength. The front spar is too far forward. mine > is on > the front side of the rear spar. Here is a link to my details. > http://mywebpage.netscape.com/n886mj/bellyboard.html > > > ----- Original Message ----- > From: "Ralph H Snyder" <ralphnd...@juno.com> > > > I want to mount the belly board between the front and rear spar. > I can't > > mount it behind the rear spar because that is my luggage > compartment. I > > searched 235 messages in the archives and only 2 were mounted > ahead of > > the rear spar. One was 4" behind the front spar and the other was > > somewhere in between the spars. > > Has someone mounted it in between the spars? How well did it work, > and > > how was the stability? > > Thanks for any information > >
