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Foam winged Delta - I require some advise

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Old 01-09-2003, 03:25 AM
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murrat
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Default Foam winged Delta - I require some advise

I would like a little advice on foam wings for a delta. Similar to a Diamond Dust shape and size, but with blue foam instead. I would like to cover with glass or kevlar. I didn't want to sheet the foam.

Is this OK?
Can these wings take 200Mph?
Do I need to cut a slot in for a wood spar with the stiffer blue foam?
Can I simply use some carbon fiber strips to stop the wing from buckling?

If someone knows of a good web site for this type of construction method, please post it so I can take a peak at how others do it.

Thanks in advance.
Todd
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Old 01-10-2003, 02:09 AM
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Blue Skyy
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Default Foam winged Delta - I require some advise

You didn't state a wing span, but if you are copying a DD, you will probably be ok with using inlay Carbon fiber so long as you glass the foam. The glass composite is really where the strength is and it can take well over 200 mph so long as you don't try pulling too many G's

I have done this and it works really well, but I use a carbonfiber spar in every project. Virtually no weight releative to the additional strength. I use the white foam to save weight in mine. The blue foam doesn't add that much strength in relation to the extra weight. Sheeting the foam just adds way too much weight to a project like this. It isn't necessary. I have done this too and you just end up with a lead sled.

I also run a lateral lite ply spar nose to tail. I am photographing a foam Delta wing project I'm working on now. Maybe I can get some pics up of the construction process in the next week.

Bob Holmes
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Old 01-10-2003, 02:24 AM
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Default Foam winged Delta - I require some advise

Some pictures would be great Bob.
Another question. Do you recommend kevlar for elevon hinging like the wiplash is done? It is reported that they are very stiff but strong.


Thanks in advance
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Old 01-10-2003, 06:23 AM
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Default Foam winged Delta - I require some advise

I have never use kevlar for hinges so I have no experience with them. I've never had a control surface separate to date using conventional methods. The Kevlar question might be a good one to post for people in the know who have used them vs the conventional methods.

Bob Holmes
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