Preferred method of mounting the RC engines?

Also consider using "ny-loc" nuts for mounting purposes. The choice dependends upon the type of mount (either lug or radial) and their accessability once in the plane.

SD

Hex head bolts, flat washers, lock nuts, and ball drivers is what I use for hardware.

I believe the OP is talking about a Sure Start type engine, in which case, yes, you would shim it out from the firewall with some hardwood sticks.

I believe the OP is talking about a Sure Start type engine wrote:

Yes tubebass (old Ampeg?), that is exactly right. Sure start type of backplate.

A while back, I got some "adapter backplates" from Bernie that have a channel for the choke tube, and mount flat to the firewall. Not sure if he still stocks them or whether they might work for you. wrote:

Kim, yes that is just what I thought I would find being sold for them, found nothing. I'll track down that Bernie fellow and inquire!

Thanks for all the comments and suggestions.

Bernie is
http://coxengines.ca/
the part you need
http://coxengines.ca/cox-.049-engine-firewall-helicopter-mount.html

Just for reference Matt is
http://www.exmodelengines.com/

Bernie and Matt provide a lot of support for this site, and are both great to do business with.

Phil

pkrankow wrote:Bernie is
http://coxengines.ca/
the part you need
http://coxengines.ca/cox-.049-engine-firewall-helicopter-mount.html

Just for reference Matt is
http://www.exmodelengines.com/

Bernie and Matt provide a lot of support for this site, and are both great to do business with.

Phil

Dex, Just a "heads-up"... Bernie is on Holiday for a few weeks. "Theresa" will be the person to contact at Cox International.

Walmart carries a mixed pack of hardwood square dowels in the craft section for a buck or so.  3/16" or 1/4" will get you shimmed out enough to clear the choke tube.  Like others, I prefer to use socket head screws and blind nuts rather than screws.  If the engine needs to come off the plane, you don't have to worry about stripping if you used wood screws.  I simply trial mount the engine, then dremel the screws to length so they are flush with the nut face, thus eliminating any chance to damage behind the firewall.

Since some of the shanks on the blind nuts may protrude thru the firewall (I generally use only 3/32 plywood), I'll mount the nuts, then file the shanks flush to the firewall on the front side before mounting the firewall in the plane.

Blind, tee, captive, whatever you wanna call them, fit and forget.
Good enough for a YS160 or a Hacker A60 22 good enough for a Cox 049.