cowl bumps

[mgold]

got a set from 1991. they are plastic. any ideas on what rivets to use.
some say soft ones. and warm up the bumps. thank you for your time.

[whake]

Re: cowl bumps

Are they plastic or fiberglass ? I would be tempted to use large head alum pop rivets with a plastic washer. I used alum. bumps from Wag Aero. I should of spent a little more money and purchased Aerocoupe bumps from Aircraft Spruce. Just for appearance.

[mgold]

Re: cowl bumps

the statement from the taylorcraft fac. and they are plastic. thank you for your time.

[TimHicks]

Re: cowl bumps

Mine are plastic also. I'm pretty sure that they have no fiberglas in them because one is starting to break. And at the break, there is no evidence of fiberglas.

Mine are also held on by screws. Lots of philips head screws.

[Forrest Barber]

Re: cowl bumps

The factory F-19 bumps and interior snap in headliner was "royalite" . They had the molds in house. I have seen many methods. I swiped a part of aluminum ones off my D model to put on the B .

[hangarb7]

Re: cowl bumps

My two Royalite plastic bumps were cracked at every steel (hardware store) pop rivet, so I removed them, roughed up the underside, and coated with JB-Weld epoxy.

Then I added a little epoxy under each rivet hole to give it a seat to sit on. You see, the plastic bumps are very thin and have a rolled edge that when the screws are tightened, or rivets set, the plastic is pulled very strongly to the cowl. This stresses the stuff until it cracks.

Repainted and attached with aluminum gutter style pop rivets which do not pull very hard at all. If I had to do it from scratch, I would use the small screws but I already had big holes.

Jack D
N44057

[Forrest Barber]

Re: cowl bumps

yep it ain't rocket science. I am thinking........ what happened to the Royalite molds for all that stuff from the Feris era? I imagine it is at the Factory?

[VictorBravo]

Re: cowl bumps

F I B E R G L A S S to the rescue... Glass is probably the best choice if you are going to make up a home-brew replacement set.

My guess is that the aluminum Ercoupe bumps are a good choice also.