View Full Version : RFFS glider plans?
all_fly_all_day
09-10-2002, 06:09 PM
hi all. i am looking to make a glider with the rffs system. two 50 nicads. and two actuators, rudder elevator. i would get it up by using s hook on the plane and fly it up like a kite wiht string of course! But heres my problem. i dont know where to start. i dont want to scale down other glider plans. and i want a 2D body. i am just asking for some specs for how i should build it. wingspan. chord, wing type rib type all that stuff. thanks a bunch
Brandon
Dave Robelen
09-11-2002, 12:30 AM
Hi Brandon,
The Mini Kestrel that was published in RC Microflight would work really well with your RFFS-100. 36" span, T-tail, scale like. The wings are tapered and slender, so that span does not mean a huge wing area.
Regards, Dave
Mike Taylor
09-11-2002, 10:59 AM
I have an old set of plans for a (Sterling? Guillows?) Schweitezer 232. It about 36" WS. I thought about building one for the RFFS when I went the the plans box the other day. It looks like a good candidate. If the kit is no longer available (I didn't see it listed anywhere), perhaps I could scan them for you... As I remember, it flew pretty well...
all_fly_all_day
09-11-2002, 06:14 PM
Thanks. Im not a subscriber to RCmicroflight so i couldnt get the mini kestrel plans. thanks anyway tho. Do you have apic of the Schweitezer 232 Mike? I would realy appreciate it if you would be able to send me the plans. I am really excited about this. I have never really had a launching spot for a full size glider or have the money for it;) . since i had the rffs system already. I figured it would be the best for this. since its so light and all. Does anyone have any opinions on my "kite" launching idea?
Thanks again!
Brandon
Richard Miller
09-11-2002, 09:03 PM
Mr. All FLy, Sir,
Everything is determined by the point where two curves cross. One, in the present case, is absolute size, the other aspect ratio. My experience with smallish models, and the 36" 2-32 is the one I have on my mind, is that when they get to about that size the performance goes over the falls.
I don't recall the AR of the 2-32, although I've flown one, but if it was around 12-15 or so the average chord would come out to little more tha a couple of inches. I'm sure Dave will back me up in my estimate that this would be very VERY difficult to fly well.
-Richard
Dave Robelen
09-11-2002, 09:47 PM
Hello Richard,
Actually, the average chord on the Mini Kestrel is 2.25", and both the L/D and sink rate are quite respectable. I experienced a large jump in performance when I installed a rather unique turbulator on the wing LE. After building several of these many years apart with similar results, I can accept that this performace is repeatable.
Regards, Dave
Richard Miller
09-12-2002, 01:41 PM
Well, if you're going to play that :confused: way I guess I'll just back off and reconsider. It's not at all a bad thing to have to do that every once in a while.
I watch, meanwhile, and am always pleased to see such fine models being built and displayed.
-Richard
all_fly_all_day
09-12-2002, 10:28 PM
Thanks everyone for the replies! If anyone is able to send me some plans, my email is drummerboy4490@yahoo.com and THANKS!
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