The baffles stay on the COWL, not the engine. The craft foam will melt where it touches the engine.

Don't over think it. The idea is to direct the incoming air over the "cooling fins" on the motor. That heated air then has to leave (ie. bigger outlet than inlet). If the hot air gets trapped in the cowling, it is a bigger problem than you started with.

coroplast sign board works awesome easy to cut and shape without FG or CF dust and comes in many colors. i use clear silicon to install on cowl. 1-2 hour complete

Originally Posted by scooby61

Hope someone can help
Im trying to baffle my skywing 91 ars300. With gp76.
I have some 3d printed ones that dont quite fit and was trying to make craft foam but the issue i have is i cant get the cowl on with the baffles mounted because they hit the front of the exhaust cans. I was considering using the method of building a baffle box the stays on the motor when the cowl is removed but not sure if craft foam will withstand that.

Post #63, My foam baffles with the ARS300 91" GP76. . . Not sure what issue you're running into? The right cylinder inboard wall is close tolerance against the stock muff when putting the cowl on, you may have to allow it to bend a bit - but it works.

Originally Posted by AKNick

I’ll contribute here. I have quite a few single cylinder foam baffles. Note I use little side gussets to support and also bend around the contour of the tapered fins. Baffles extend to just past the center of the cylinder. 73” AJ Laser, 74” EF Edge, 75” 3DHS Edge, and then my 91” SW ARS. No, It' not perfect and lowers the bar in comparison to some of you guys, but hey it works and may give some other guys an idea.
Also a few pics of some air dams

In case you want to use my Air Dam designs:
Large Air Dam STL used in the Edge and ARS: https://www.thingiverse.com/thing:4504315
Thin/Smaller Air Dam STL on the Edge Fuselage: https://www.thingiverse.com/thing:4462528
Air Dam Lip STL on the ARS: https://www.thingiverse.com/thing:4461237

Originally Posted by AKNick

Post #63, My foam baffles with the ARS300 91" GP76. . . Not sure what issue you're running into? The right cylinder inboard wall is close tolerance against the stock muff when putting the cowl on, you may have to allow it to bend a bit - but it works.

Yeah i looked through the whole thread Nick and yours look plenty good enough for me.
Rc 3d print is redoing the ones i got from him hopefully next week will have ones that fit

Originally Posted by scooby61

Yeah i looked through the whole thread Nick and yours look plenty good enough for me.
Rc 3d print is redoing the ones i got from him hopefully next week will have ones that fit

nice, I cannot imagine designing a set of baffles without having both the engine and the airframe to observe myself. Not sure how RC3DPrint does it accurately.

So whats the generally successful way to attach foam baffles the peices to each other and the assembly to the cowl?
Ive seen it said to use epoxy, ca, rtv, hot glue?
Hot glue seems like not a good idea as it will melt if it gets good and hot under there.

Originally Posted by scooby61

So whats the generally successful way to attach foam baffles the peices to each other and the assembly to the cowl?
Ive seen it said to use epoxy, ca, rtv, hot glue?
Hot glue seems like not a good idea as it will melt if it gets good and hot under there.

For the craft foam/darice CA works great. Attaches to the cowl easily and if you need to speed it up spray some accelerator on it. I like using the craft foam cause it’s flexible and it glues to itself (stiffeners) really well, can’t say enough good things about it.

Originally Posted by scooby61

So whats the generally successful way to attach foam baffles the peices to each other and the assembly to the cowl?
Ive seen it said to use epoxy, ca, rtv, hot glue?
Hot glue seems like not a good idea as it will melt if it gets good and hot under there.

I used hot glue almost exclusively for baffles. No issues with the glue at all. Engine range DA120,DLE120,DA150/170 DLE222.

I prefer Goop, but I have used thick CA too.

Originally Posted by scooby61

So whats the generally successful way to attach foam baffles the peices to each other and the assembly to the cowl?
Ive seen it said to use epoxy, ca, rtv, hot glue?
Hot glue seems like not a good idea as it will melt if it gets good and hot under there.

I've been using Medium CA and accelerator when needed.

Hi guys

Can you help me please by writing here what’s the mvvs 58 walbro carb?
Trying to find out but I can’t match it to anything I know of.

Thanks

Originally Posted by TazmanianDevil

Hi guys

Can you help me please by writing here what’s the mvvs 58 walbro carb?
Trying to find out but I can’t match it to anything I know of.

Thanks

3227 looks like?

https://www.topmodelcz.cz/index.php?..._eshop_id=1991

https://eshop.mvvs.cz/gb/carburettor...0-190-cm3.html

A few pictures of the baffle I installed on my Hangar-9 P51-150. I got tired of flying without the cowl!!

im redoing one now what engine are you running in yours Thanks