In your converstaion with Dean did he provide any rational why simply extending the tip by 10" on a Moose with an aluminum skin wouldn't work just as well? Alternatively, one could take the tips provided originally and add the additional glass to extend them by 10" THe mold could be the existing wing. I am sure if one gave it some thought a fence could be built in as well. THis would provide for the reduced wing loading he described. I haven't given it lots of thought, but it seems it might be less expensive than $800. Am I nuts ?
RIck Muller
SR70
-----Original Message-----
From: Drew Dalgleish <drewjan@cabletv.on.ca>
Sent: Apr 13, 2004 6:11 PM
To: murphy-rebel@dcsol.com
Subject: Re: Wing tips
At 04:29 PM 4/13/2004 -0400, you wrote:
Hey a little Nitrous for the engine and a little for the pilot to reduceDrew
I don't know which is better, a drooped, hoerner, or turned up winglet,
but all will generate more lift at the outboard wing section and reduce
drag. That effectively gives you an aerodynamic wingspan increase. Since
the outboard section is generating more lift they do put more bending
stress on the wing for a given load. MAM did suggest not extending the
physical length of the wingtip for Rebels on floats (such as could be
done with Dave Fife's first batch of tips). Apparently they've decided
that isn't an issue at least for the Moose. Tip design is more
significant for our "hershey bar" wings than for tapered wings which
already have somewhat reduced tip drag.
A little nitrous might be the cheapest easiest way to get over the trees ;)
That said I'm wondering what the effect would be of a relatively simple
metal wing fence maybe 4 or 6" high above (or below) the wing but
mounted immediately inboard of the wing tip or even on the existing
fiberglass tip. Might do as much as the drooped tip...
Good luck with the fiberglass work.
Ken
the pucker factor as those trees draw closer :) Right now I just Make my
wife walk to the next lake and I pick her up there. It's got a lot more
room for taking off and it helps her understand how much we NEED a new
motor. My existing tips don't fit very well and are cracking at the
trailing edge so I had to do something anyways. I've considered wing fences
as well but on all the stol kits I look at it seems the fence is placed at
the junction of the ailerons and flaps. I might even do some experimenting
with vortex generators.
I talked to Dean at murphy today and it seems the main reasons for the
new moose tips is the plane was stalling at 58knots on floats plus
insurance companies and transport Canada don't like the high wing loading.
So the wing area increase makes everyone happy. He also said that a small
incease (up to 10") on the rebel wouldn't be a problem. That would make the
tip about 22" and I think that's a bit much. I'm planning on something in
the 16-18" range.
Drew
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