How to make a Q500 wing??  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Q-500 Racing >> How to make a Q500 wing?? Page: [1]

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How to make a Q500 wing?? - 4/11/2007 12:33:20 AM   
Xardas26


 

Posts: 42
Joined: 2/10/2006
From: Brandon, FL, USA
Status: offline 		I've been flying in the 424 class for a year now using my GP Viper, but now I would like to try other designs and airfoils. The problem is that I don't know enough to build a wing that will withstand the high g forces. I do know that a q500 wing has a styrofoam core that is sheeted with 1/16 balsa wood, and that the center section and TE are reinforced with layers of fiberglass. I don't however, if the wing has a spar and how to build it. I found several plans on q500.org, but they don't show how the wing is built.
Can anybody please help me????
       Post #: 1

RE: How to make a Q500 wing?? - 4/11/2007 1:05:24 AM   
HighPlains


 

Posts: 2637
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		There are many ways to skin a cat, but for a 428 wing...

I use 3/32 skins for the top surface, and 1/16 with a .007 x 1/2" carbon fiber strip glued to the inside surface of the lower skin. Both skins are 7 to 8 lb. stock. The CF only needs to be 30-36" in length on the lower skin only, none on the top.

With the higher weight standard now in effect, you can use 3/32" skins top and bottom.

A spar is not needed, but glass the center section with tapered layers of 2 oz cloth, wider at the front of the wing.

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RE: How to make a Q500 wing?? - 4/11/2007 1:23:34 AM   
Druce



Posts: 79
Joined: 1/6/2002
From: Edmonton, AB, CANADA
Status: offline 		Do you put the carbon fiber down the middle of the wing on the bottom? How about a strip about 1" on top of the wing along the trailing edge for a hinge line also?

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RE: How to make a Q500 wing?? - 4/11/2007 1:32:48 AM   
HighPlains


 

Posts: 2637
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		I put the carbon strip at the thick point of the airfoil on the lower skin, just as a tension member. I don't use skin hinges, but there have been several articles on that. Use the search function.

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RE: How to make a Q500 wing?? - 4/11/2007 5:31:07 AM   
HighPlains


 

Posts: 2637
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		A couple of pictures of the center section glass with the edges outlined. Front holddown is 3/4" dowel drilled and countersunk for 1/4-20 bolts. The rear holddown is inlaided 1/8" plywood plate for the 10-24 flathead bolts.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


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RE: How to make a Q500 wing?? - 4/11/2007 12:02:11 PM   
Ed Smith


 

Posts: 2816
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline 		Centre section glass is not necessary and adds too much weight. I use 1 strip of 2oz glass at the centre section. It is just wider than the fuselage to provide a hard surface for the wing saddle and prevents the fuselage from "Bedding" into the wing skin.

Laying reinforcement strips flat on a wing is pointless. The strength /stiffness gained is out of proportion to the weight added. Such strips can be snapped very easily. I use a 24" spar the full depth of the core at the high point of the airfoil. The spar is 1/8 Liteply with carbon tow glued either side of it with epoxy resin. The spar weighs 20 grams and when glued into the slot is virtually unbreakable.

Ed S

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       Post #: 6

RE: How to make a Q500 wing?? - 4/11/2007 6:19:35 PM   
rmenke


 

Posts: 1726
Joined: 6/25/2004
From: Merced, Ca., CA, USA
Status: offline 		Ed: Looks like you are running two servos in the second wing, I guess for backup or flaps. If for flaps, how does it work out and at what %. Thanks

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RE: How to make a Q500 wing?? - 4/11/2007 7:43:58 PM   
daven



Posts: 6736
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		I believe that wing with two servos was Bobs, not Ed's.

Some of the guys use two servos to add reflex to the wing in a turn. Flap's are really not necessary in a Quickie.

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RE: How to make a Q500 wing?? - 4/11/2007 9:18:14 PM   
bigtrev@xtra.co.nz


 

Posts: 250
Joined: 9/25/2004
From: christchurch, NEW ZEALAND
Status: offline 		Ed, did you get my email re model, can you email me please bigtrev@xtra.co.nz ............I have the rum!

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       Post #: 9

RE: How to make a Q500 wing?? - 4/11/2007 9:56:22 PM   
MadScientist



Posts: 208
Joined: 6/16/2003
From: Kissimmee, FL, USA
Status: offline 		Dave,

What's the idea behind introducing reflex into the wing when turning? I've never seen that done on a Q500 and am curious as to the reasoning behind it. Thanks

Tony

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RE: How to make a Q500 wing?? - 4/11/2007 9:57:03 PM   
HighPlains


 

Posts: 2637
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		Two aileron servos for control redundancy. While modifying the coefficient of lift of the wing over it’s span has certain advantages for racing, you can’t achieve that with just short ailerons set midspan.

As far as having a spar, vs. stress skin design, both methods work. On the stressed skin method, the upper surface skin takes the load in compression, and a thicker balsa skin does that quite well. Since the lower surface is in tension, the addition of the .007 carbon strip does that as well too. I have the center glassed since I find it easier to build two short panels and join them after construction. As far as weight goes, I usually had to add between 1 to 2 oz. of lead to the finished models anyway when the minimumweight was 56 oz.

This wing was destroyed after it’s second mid-air. Both times were while lapping traffic.


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RE: How to make a Q500 wing?? - 4/12/2007 12:52:22 AM   
Xardas26


 

Posts: 42
Joined: 2/10/2006
From: Brandon, FL, USA
Status: offline 		Thanks for the input guys. I sort of have an idea now how the wing is built. However, I still don't know how u guys make the trailing edge because assuming that i'm using 3/32 skins for top and bottom, it would mean that I would end up with a 3/16 thick trailing edge. I think somebody wrote something about putting a 2 inch wide fiberglass cloth along the trailing edge between foam core and the lower skin. However, I don't know how to sand it to come up with a sharp straight TE. Any suggestions??

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RE: How to make a Q500 wing?? - 4/12/2007 3:40:00 AM   
bigtrev@xtra.co.nz


 

Posts: 250
Joined: 9/25/2004
From: christchurch, NEW ZEALAND
Status: offline 		the idea is to sand a taper in the trailing edge portion of each skin, but on the inside face, say about 50mm wide, with careful drawing of the airfoil cross section you will be able to establish exactly how wide that taper should be............the other way, but not favoured by me is to glue the sheets together as you describe and end up with a thick trailing edge, THEN sand the surplus balsa off from bothsides, using the glue line between the sheets at the TE as the sanding line. Neither is difficult, but take it slow and be careful- an extrta 15 minutes of your time will give you a real good job- wish you well, trevor h nz

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RE: How to make a Q500 wing?? - 4/13/2007 4:37:40 PM   
StanDouglas


 

Posts: 112
Joined: 8/28/2003
From: Austin, TX, USA
Status: offline 		This may be over kill, but I use Carbon Fiber Laminate, .014"x3/8" on my trailing edges. I trim away about 1/4" of the foam at the trailing edge and butt the laminate up against the foam after I have set it in the skin. To keep it from moving I tack it to the foam with CA. Then I do the skins either by bagging or with weights on the foam shells. I clamp the trailing edge of the wing skins with aluminum angle stock (1/16" thick 1/2"x3/4"x48" at Home Depot). One on the top of the trailing edge and one on the bottom with clothespins every 3 inches or so. After the wing sets up the trailing edge is absolutely straight. (I use scrap laminate to fill out the remaining 2" on each wing tip)

Now I can sand the trailing edge down to the laminate. The balsa sands way easier than the laminate and the edge is supper strong and if you carefully sand the laminate a little you can get it very sharp.

Laminate is from AeroSpace Composites CL2-41A around $6 for 2@48" length. Carbon fiber and kevlar is getting out of sight!

Stan

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       Post #: 14

RE: How to make a Q500 wing?? - 4/13/2007 4:51:23 PM   
Ed Smith


 

Posts: 2816
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline 		I do basically the samed as Stan. Whe