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wood/metal glue
Cita - 4/3/05 at 11:15 PM

I need to make a strong bond between plywood and steel (for one of my crazy helicopter projects)
The load will be mainly in shear and the bonding area is rather large.
Any suggestions on commercial available glue's beside epoxy if this is not the best solution (epoxy glue)

Thanks guys

andkilde - 4/3/05 at 11:37 PM

Hmmn

I would think one of the urethane based adhesives like Sikaflex or perhaps one of the thicker 3M VHB tapes might be the way to go.

The adhesive people have good spec sheets available for all of the industrial adhesives -- the better companies usually have engineering folks you can chat with as well.

I would think that something brittle like an epoxy or cyanoacrylate would have a difficult time dealing with the difference in expansion between metal and wood.

Cheers, Ted

Peteff - 4/3/05 at 11:47 PM

I'd drill some holes in the wood, tap some in the metal and put a few countersunk bolts in. Especially if it was keeping me in the air .

Cita - 5/3/05 at 07:10 AM

quote:
Originally posted by Peteff
... especially if it was keeping me in the air .


Who said it has to keep ME in the air Pete?
I will find (another) lunatic to test fly this thing

Hellfire - 5/3/05 at 11:10 AM

Doesn't it need to be fuel resistant? Just my experience of Model Aircraft building...

Cita - 5/3/05 at 02:33 PM

If those rotorblades come in contact with fuel than there is defenitely something wrong with the concept i guess.
It's just a prototype Helfire or a proof of concept if you like.
For the moment it only needs to withstand the forces involved and i hope to deal with "the regulations" in a further stadia...if there's gonna be a "further stadia"
Right now my main concern is to build the blades as safe and strong as possible and avoid possible problems like contact with fuel or hazardous licquids wich could dissolve the glue.

Hellfire - 5/3/05 at 02:57 PM

But you never said it was for the rotor blades did you and as engines of this ilk are not too efficient the exhaust always emits small amounts of raw fuel in the exhaust gasses and this then corrodes the adhesive.

Cita - 5/3/05 at 07:23 PM

quote:
Originally posted by Hellfire
.... and as engines of this ilk are not too efficient the exhaust always emits small amounts of raw fuel in the exhaust gasses and this then corrodes the adhesive.


I'm gonna use two 125 cc engines so i hope they're not emit too much fuel through the exhaust.
Further i hope that the downwash will deal with the exhaust gasses.
Do you have any idea of a good glue for this HELFIRE (wood/steel) as this was the original question

Mix - 6/3/05 at 03:35 PM

3M Scotch-Weld 2216 is a two part epoxy resin used for that sort of application in the aircraft industry.
Check out 3M's web site for info on similar products.

Mick

Cita - 6/3/05 at 07:24 PM

Thanks Mick!!!!