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Old Feb 07, 2013, 08:07 PM
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United States, CO, Colorado Springs
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Question
NSP Bird of Prey design?

Hey, all. I'm looking for info on the old Bird of Prey from northeast sailplane.

My dad had one a few years ago and would like to either find one, or find enough information to be able to duplicate the design from scratch. It had a very unusual planform, and he liked it a lot.

I think it used the Selig 7080? Anyone know any more about it?
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Old Feb 07, 2013, 08:59 PM
Ochroma Lagopus Tekton
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Blackstock, South Carolina
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Only "Bird of Prey" I know of was a small electric foward swept pusher jet. I did come across a slope version with a very similar design though, is this the one you mean?
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Old Feb 07, 2013, 09:04 PM
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That Sparrow is not even close to the NSP one or did you know that already. I have a set of plan's for a 2m model of the XFG-1 fuel glider and it look's a bit like your Sparrow. Your Sparrow also look's like a Tucan FSW sloper.
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Old Feb 07, 2013, 09:53 PM
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Nope, it's a full sized TD ship. 3m, maybe 3.2? Standard tail, slightly swept, crescent wing.

Found some pictures of one here:
http://www.rcgroups.com/forums/showp...8&postcount=10
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Old Feb 07, 2013, 11:53 PM
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It's in a couple of the NSP catalog's I have. I personally don't know anything about it and have never flown one. I do wish you luck in your search. I've done it a few time's too.
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Old Feb 08, 2013, 08:45 AM
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Thanks, I'll need it, I think. (-:

Does your catalog say anything about airfoil or span?
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Old Feb 08, 2013, 09:25 AM
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And my catalog say's 7037. 120" W.S.
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Old Feb 08, 2013, 11:41 AM
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You might contact Phil Barnes. Odds are he made wings for this NSP ship as he did many others for them.

JT
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Old Feb 08, 2013, 07:13 PM
Jim C Patrick
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Shenandoah County
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The Bird of Prey was listed on NSP's site from 1996 with an obechi-sheeted wing until ~2000, then the Bird of Prey C (composite wing) was introduced and and stayed listed until the website closed, so there's probably one still in the warehouse. The airfoil is a modified SD7037.
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Old Feb 08, 2013, 08:07 PM
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I wonder how many other NSP model's are in Sal's warehouse. A former employee has mentioned as much. The only one I really loved is the 2m Alcyone. Ever since I saw it on a SW Classic T-shirt year's ago. I do have a nib Kestral 2m, some day.
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Old Feb 09, 2013, 02:06 PM
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I have a 3m Alcyone that is still flying...after many, many years...
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Old Feb 09, 2013, 09:33 PM
Ochroma Lagopus Tekton
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Quote:
Originally Posted by prodjx View Post
That Sparrow is not even close to the NSP one or did you know that already. I have a set of plan's for a 2m model of the XFG-1 fuel glider and it look's a bit like your Sparrow. Your Sparrow also look's like a Tucan FSW sloper.
I didn't think that was the one you were talking about.
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Old Feb 09, 2013, 09:48 PM
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Hmm.. I wonder what the "modified" means in "modified 7037". 970 squares, 120", couple of pictures and some time with liftroll just might be the trick..
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Old Feb 09, 2013, 10:06 PM
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The Bird of Prey wing was the first thing I ever made for Sal at NSP. I sold the first wings to him in August of 1996. The last ones I made were around the year 2000. As has been mentioned, other versons were made prior to the foam core, carbon skinned version that I made. I wasn't even the first person to make the composite version. I certainly had nothing to do with the design of the modeI, not even the structural design. In fact I learned the structural details from Sal, over the phone. I still have the foam cutting patterns that show the planform, so I'll try to describe them:

The wing was made from three panels.

The root panel had a span of 28", a root chord of 10" and a tip chord of 9 1/8". The first panel's trailing edge did not sweep back, the trailing edge made a 90 degree angle to the fuselage center line. The tip of the root panel had a 92 degree angle between the trailing edge and the outboard end of the panel, so the aft sweep begins at that point along the span of the wing.

The second panel of the wing had a span of 19 5/8", a root chord of 9 1/8" and a tip chord of 7 1/8". It had 92 degree angles at both the inboard and outboard ends of the panel.

The tip panel had a span of 12", a root chord of 7 1/8" and a tip chord of 4 1/8". The root end of this panel also made a 92 degree angle to its trailing edge.

The construction was solid core bagged. It used spyder foam (or any 60 psi foam would also work as well) in the root panel. Any 25psi foam would be fine for the outer panels. It had a 1/2" inside diameter, 30" long carbon tube in each wing half. It had a layer of 4.8oz uni-carbon/s-glass and a finish layer of 3/4oz glass for the skins top and bottom.
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Old Feb 09, 2013, 10:10 PM
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Quote:
Originally Posted by rdeis View Post
Hmm.. I wonder what the "modified" means in "modified 7037". 970 squares, 120", couple of pictures and some time with liftroll just might be the trick..
I know of two possible reasons for the use of the word "modified" in the airfoil description:

1) No one can copy the airfoil used on the wing if they don't know what the airfoil is.

2) No one can complain that the airfoil of the wing they just got was not produced accurately enough if they don't know what the airfoil was supposed to be.

Neither reason is sufficient that anyone should think that the airfoil was ever intended to be anything other than a 7037.
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