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-   -   cap snapping (https://www.rcuniverse.com/forum/arf-rtf-75/689069-cap-snapping.html)

Chris300s 04-28-2004 08:32 PM

RE: cap snapping
 
I don't want to speak for anyone but.... I think that Dick and I are pretty similar in that we'll go to extreme measures to get the weight out. Including; lightening of the airframe (removing wood), rebuilding lighter constructed tail surfaces (sheeting over foam or hand selected balsa), lighter ailerons, smaller/lighter hardware, lighter gear, less servo's.
A couple of possibilities for you might be to move the elevator servo's up under the canopy with carbon pushrods, or better yet, pull-pull. On my 1/4 Cap's I used an MK bellcrank for elevator with 1 servo driving it, a 9304 on 6V. Get the lightest tailwheel possible. Remember 1oz in the tail equals 3-4oz in the nose to balance. I've even skeletonized the ribs in the tail to get it lighter. Definitely get the battery pack in the nose.
Look for one of Dick's construction photo's or the Troy Built Models Extra build to see lightening in action. I built the entire front half of a H9 Cap out of carbon and made a flat plate (Q400 style) motor mount just so that I could get a Moki 2.1 in there without a weight penalty or CG change. (It helps when terra firma removes the nose for you to begin with).

Chris

lhatton 04-28-2004 09:10 PM

RE: cap snapping
 
Turbulators, slots and slats are all somewhat different beasts, and are used in a variety of ways on modern aircraft.

Turbulators, Vortex Generators, Vortelons are all in a group that, by inducing vorticies on the surface, prevent airflow seperation. The increased energy on the surface is used to increase control responce (when used in front of a control surface) and in the case of vortex generators across the entire wing, increase lift at medium to high AOA flight.

Slots, both fixed and movable, allow high pressure air from the lower leading edge to pass through to the top side at higher velocity than the natural airflow over the wing, thus allowing flight at higher than non slat wings. This would happen with no increase of chord.
Slotted flaps also take benefit from this principle.

Slats work both in the slotted role and the "sealed" role. The sealed role is an increase in chord, but more importantly is a huge increase in camber, thus increasing lift for a given airspeed.

As for snappy caps, I'm in the make sure it's straight and balanced camp. I also like to do power off stalls to see which wing drops to look at the airframe and exclude any thrust questions before chasing power on snaps.

Les


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