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Old Apr 02, 2007, 02:45 PM
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Wing to Fus combo

Question.

Will an Onyx 3.4m wing fit on the fuselage of a Graphite?
The attachment bolt holes seem to be in the same 'pattern'.
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Old Apr 04, 2007, 09:08 PM
Zor
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Quote:
Originally Posted by Wing-span
Question.

Will an Onyx 3.4m wing fit on the fuselage of a Graphite?
The attachment bolt holes seem to be in the same 'pattern'.
Perhaps someone knows the answer to your question.
You say "in the same pattern" but I suppose a different measurements. If the holes had the same dimensions I imagine that you would have screwed the wing on by now.
However I would think that any sailplane wing of approximately proper size can be attached (fitted) on any of the typical sailplane fuselage by making an adaptor between the two.
The main think is to provide for the proper incidence angle.
You could have some fun and enjoy doing it.

Zor
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Last edited by Zor; Apr 04, 2007 at 09:14 PM.
Old Apr 05, 2007, 06:44 AM
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Zor,

Thanks for the responce.

Yes I actually meant the dimensional spacing of the screw holes, as they are, without modification. I know both planes share the same wing section and are the same or similar chord at the root/center of the wing. Incidence should not be a problem I hope.

I already own an V-tail Onyx 3.4m. I feel the fuselage is too short for the span and I'm not impressed with the strength also, though the wing is superb. In the near future I have the opportunity to purchase a Graphite (version 1, d-box tips) which is in perfectly good flying condition. However, I was wondering if my larger Onyx wing would fit? The idea being that I would have a fully moulded stretch wing for the Graphite for those lighter air days.

Is anybody able to measure the dimensions of the wing attachment hole spacings of a Graphite version 1 and post them here please?
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Old Apr 05, 2007, 07:43 AM
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Post the dimensions of your Onyx wing bolts and I shall check them against the Graphite 1 fuselage.

Brian
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Old Apr 05, 2007, 01:51 PM
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Ok Brian,

Will try to do it tonight.

Got to bath the baby.
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Old Apr 05, 2007, 06:35 PM
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On the Onyx:

The two front bolts are spaced 38mm apart. The distance to the rear bolt is 130mm measured with a ruler from one of the front bolts directly to the rear one. Measurements are taken from the centres of the bolt holes.
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Old Apr 06, 2007, 04:43 AM
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Wingspan
Graphte 1 fuselage:
The two front wing mounting holes are located 54 mm back from the wing leading edge.
The front holes are spaced 45 mm apart

Measured on the centre line of the wing panel, the distance from the centre line of the two front bolt holes to the centre line of the rear hole is 117 mm.

Wing retaining bolts are M4.
Wing centre panel is flat.

Hope this helps.

Brian
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Old Apr 06, 2007, 12:10 PM
Zor
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Quote:
Originally Posted by Wing-span

Is anybody able to measure the dimensions of the wing attachment hole spacings of a Graphite version 1 and post them here please?
Hi Wingspan

Some thinking (I do that once in a while Hi Hi)
I think you said "Incidence should not be a problem I hope".

Not likely, it is purely a matter of having the center line of the fuselage or its equivalent point of drag to move parallel to the flight path.
If you have the cord of the wing (plus or minus wash out or wash in) in a parallel plane to the cord of the tail horizontal surface then the lift is due to a non-symetrical airfoil

There will be a speed at which the lift will equal the weight.
There would also be an incidence angle at which this would happen at a lower speed in as much as that speed coincide with some speed above stalling speed and corresponding angle of attack.

Now suppose that this condition result in the fuselage line (referred above) is not parallel to the fligh path then both tail and wing could be changed and make the fuselage be in line with the flight path. The same relative angles would still be the same (decalage).

Is thinking out of place in this thread ???

Good flying and enjoyment in this hobby.

Zor
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Old Apr 06, 2007, 01:15 PM
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Cheers Brian,

The wing won't fit without mods, Nevermind as there is nothing wrong with the Graphite wing I now Have.
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Old Apr 06, 2007, 01:15 PM
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I'll end this thread here.

Thanks all.
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