First, let me thank you for your replies and suggestions.I appreciate
them very much. I built it to "ordinary" pennyplane specs, not
"limited". I have yet to try winding to the max then unwinding to
desired launch torque. Here is a link to a video of my plane a few days
ago, which should much more clearly describe a typical flight.
My pennyplane flight
<
http://www.youtube.com/watch?v=Vkekny2Yd0Y&feature=channel&list=UL>
I am very concerned about getting in the ceiling beams - they are very
aggressive in holding onto indoor planes! Oh yes, and I was wrong about
the prop rpm - it is clearly a good deal faster than 1.5 rpm!
Richard
--------------------------
--- In Indoor_Construction_at_yahoogroups.com, "Rick121x" <rickie121x_at_...>
wrote:
>
> I am a fairly new indoor flier and have designed and built a
pennyplane from the "best" information I could assemble. Pictures posted
in folder " Richards Pennyplane". It weighs 3.2 grams (with prop), and
all other details are basic per AMA rules. I am using a balsa sheet, 15"
dia., 25" pitch propeller. (It weighs 1.2 grams.) - and 3/32 in. "A to
Z" (Peck Polymers) Supersport rubber from my hobby-shop. Rubber lube is
STP "Son of a Gun", and seems to work very nicely.
>
> The wing is simplex 4%, and the stab is circular 3%. Thrust is
zero-zero, stab is at zero, and the wing, 4.4 deg.
>
> I set up the plane using the "ten step adjustment process", and it
flys "right on the verge" of a stall. It reliably recovers from a rafter
beam "hit". The flight balance location is 88% wing chord.(With prop and
rubber.)
>
> It flies in approx. 14 foot circle and the climb is just beautiful to
see, flying very slowly at about 15 degrees attack angle. With the
climb loading the prop, it turns quite slowly, ...estimate 1.2 to 1.5
rev. per second.
>
> Right now I am using a 1/2 length motor with weighted spacer, and
winding to 0.5 ounce-inch torque, I am getting lovely flights in a 25
foot ceiling - 2 1/2 to 3 minutes. But I would believe the cruise
period is very short. The motor has roughly 1/2 length of "knots" at
landing. If I put in more turns the climb is too high, and with a longer
motor, the flight is longer, but of variable heights, with the causes
unknown to me.
>
> I would very much like to achieve a longer cruise time and and with
slower descent. Is there anyone with experience to suggest the next
logical step to me to take?
>
Received on Fri May 18 2012 - 15:21:17 CEST