Techniques > How to...
Glider wing mod and reinforcement
skyhawk newbie:
As a newbie.......... :oops:
Just wondering what you guys do to reinforce your glider wings ....
If you fit a carbon fiber spar how long it is and what diameter ...
do you use a flat or round spar...
where about in the wing do you fit it ...
Regards Sean
Aidan:
--- Quote from: "skyhawk newbie" ---As a newbie.......... :oops:
Just wondering what you guys do to reinforce your glider wings ....
If you fit a carbon fiber spar how long it is and what diameter ...
do you use a flat or round spar...
where about in the wing do you fit it ...
Regards Sean
--- End quote ---
I think the answer to that would have to be "It depends...."
It's very difficult to give a general answer.
Why are you reinforcing the wing? Is it a repair, to handle extra power due to your new power system or are you trying to make it crash proof?
Crash proofness is pretty much impossible to achieve with anything but very small planes or by making the plane from flexible material (typically EPP). Often the extra weight and stiffness added by reinforcements has the opposite of the planned effect and just makes the plane more likely to break. Weight can also make it harder to fly so a crash is more likely too!
For a wing with a single spar, that spar will normally be at or near the thickest part of the wing to maximise the stiffness it provides. This also puts it near the point on the wing chord (an imaginary line from the leading edge to trailing edge) where the result of the combined aerodynamic forces appears to act which means aerodynamic loads in flight are less likely to cause twisting of the wing around the spar.
The length will depend entirly on the purpose and the wing you're adding the spar to.
A tube provides torsional stiffness (resistance to twisting) as well as resisting bending loads. A strip positioned vertically will be good for preventing vertical bending (which is what you get from lift) but not very good for bending forward and back or torsion. If these aren't needed because it's already stiff enough then a strip is a good option.
Aidan
billscottni:
As Aidan says, need more info.
Size of wing, length and mean chord.
What the wing is made of. Type of construction, (open rib, Foam).
What type of flying was it designed for and what do you want it to do now that needs more strength?
skyhawk newbie:
The SkyHawk glider that I've got..
http://cgi.ebay.com/New-4Ch-RTF-RC-EP-Aerobatic-TW742-SkyHawk-Glider-Plane_W0QQitemZ290326804731QQcategoryZ19164QQcmdZViewItemQQ_trksidZp3286.m7QQ_trkparmsZalgo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D63%26clkid%3D5078401181636134857
The wing is 115.5cm or 45 1/2 " in length, chord is 21.5cm or 8 1/2"
and made of foam......
The wing has a very narrow channel where a wooden connector rod (about 4" long ) sits inside a plastic housing. I would like to place a carbon fiber rod there, but I am not sure whether to make it go all the way to the end of the wing or just 12" or so. The wing is basicly screwed together with a square-ish piece of plastic that holds the ailaron servo in place,
I'm thinking of removing the plastic connector and epoxy a aluminum plate instead, as I'm going to fit twin servos for the ailaron..
Then lay a piece of carbonfiber rod, about 1ft long along where the wooden rod was on the wing and epoxy the carbon fiber rod in and then run some tape over it.....
Would this work.....
Happy Days:
They say a picture paints a thousand words Sean :D
You might like to get your camera out and post a few pictures of what you want to do….?
(Just going back to what Aidan said, you can’t make them crash proof without making them much heavier and more difficult to fly! :!: )
K.
Navigation
[0] Message Index
[#] Next page
Go to full version