Gunsmithing Kwestyun for the composite resin wizards

[LRI]

High temp resin tolerant of exhaust gasses/oils that's appropriate for carbon fabric.

This is for an exhaust system on one of my RC racing planes.

Help appreciated.

C.

 

[The Mechanic]

Re: Kwestyun for the composite resin wizards

Check this out. R/C stuff doesn't get to hot if I am not mistaken (compared to say a turbo downpipe)

high temp stuff
http://pitstopusa.com/c-133934-exhaust-system-heat-management-hi-temp-spray-coatings.html

http://pitstopusa.com/c-133226-exhaust-system-heat-management-heat-mat-adhesives.html

500 degree
http://pitstopusa.com/i-5074936-dei-design-engineering-heat-sealant-adhesive-3-oz-tube.html

 

[ejg]

Re: Kwestyun for the composite resin wizards

I'm sure my Resin supplier would have some but that's bloody useless as they are in Germany.
I used to race F3-D and also took part in the Worlds 89 USA/ 91 Aus.
In the end I adjusted mixture on our 6.5 rossi via reading exaust temp in the middle of the tune pipe. Think around 260 deg. C was about ideal for my compression rate and nelson plug.
One Aussie ran I think 18:1 compression and kept it very rich...also worked, I think the setup ran much cooler than our low comp rate running leaner.
Still got my last composite FAI racer hanging in my office....just to remind me. I miss them screaming engines.
edi

 

[jonwatts]

Re: Kwestyun for the composite resin wizards

Chad,

Polyester or vinyl-ester resins won't do the trick. It will need to be a high temp epoxy that requires a post-cure. Don't know what your exhaust temps are, but it will probably need to be a somewhat sophisticated epoxy for your app with a slow ramp-up, ramp-down post cure . For starters look at Resin Services Inc., PTM&W, or Freeman Mfg. There are literally hundreds of epoxy formulations available. I'm not sure if any of these suppliers will have one rated high enough for you but you can call and ask. They generally have pretty good tech support.

Jon

 

[SDeadeye]

Re: Kwestyun for the composite resin wizards

Might be worth a call or visit to the CAPE (Composites and Polymer Engineering) Lab in Rapid up on St. Pat behind the school. I've done seats and clutch covers up there for a project but nothing that sees very high temps. Not sure if they would be willing to help or give you some advice or not, but they've got more equipment up there than they know what to do with, so you might be able to work something out.

SDSMT CAPE Lab

 

[Straight Shooter]

Re: Kwestyun for the composite resin wizards

NIC has specific coatings to be used for exhaust applications. Thermo-Dyne
http://www.nicindustries.com/contact.php
I have been using their products on my race car headers and internal engine parts for going on 30 years. It was developed and is currently used in military jet engines. If it lives on top fuel exhaust valves and piston tops I believe it should stand up to your toy plane.

I'm emailing you a brochure or 3