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Dec 11, 2012, 04:24 PM
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kerwin50's Avatar
You may want to run a static port for your carb. More than likely there is going to be a large pressure build up in the cowl.
Dec 31, 2012, 06:04 AM
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Excuse my ignorance Kerwin, but I'm not familiar with static ports. Could you explain a little more about that? I have the plane completed now but have yet to update the thread. I'm just wondering if this is something for me to be concerned about?
Dec 31, 2012, 09:01 AM
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kerwin50's Avatar
There's a hole in your carb cover that keeps the diaphram atomspheric pressure. When you have a cowl that builds up pressure, it changes the mixture, and in lots of cases creates a dead stick.
What people do is solder a tube in the carb cover. The run fuel tubing from the cover to a flat spot on the outside of the fuse. Behind the landing gear is the best,
Other people have ran the tubing to a film canister with a small hole in it, placing it in the fuse as well.
I've done both and the static port works the best.
But now days with my 3D flying I just open the bottom of the cowl for the necessary cooling.
The rule for normal cooling is 3 times the incoming air opening.
These motor can really get hot in a hover.
Jan 02, 2013, 12:22 AM
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Nicky2times's Avatar
On my sbach i used a pitts style muffler and what i ended up doing was cutting a hole like 2 1/2" wide and 3"long for the muffler to stick out and also so i could get the cowl on and off easier. This also created a big enough outlet to get air out. Another cleaner way to make the exit holes with your set up would be to use a dremel with the small drum sander and cut some vents in the bottom like for instance 1/2 x 1 1/2" slots, 3 in a row just like an air vent in a house. This allows for proper air exit and looks clean.
Jan 31, 2013, 06:31 PM
My hovercraft is full of eels.
How's this build coming along?

I think these are the most beautiful Sbach models available. Nice to see the new scheme on something a little bigger than the UMX. Can't wait to see more.
Feb 12, 2013, 04:56 AM
Registered User
I have some vents cut in the cowl that you can sort of see in one of the last pics. I probably need more though. I didn't realize that's what you were talking about.
Mar 05, 2013, 04:40 PM
Registered User
What prop are you using?
Mar 05, 2013, 06:58 PM
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kerwin50's Avatar
Your build looks so good. I can't wait to hear about your maiden
Jul 12, 2013, 05:05 AM
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Quote:
Originally Posted by MrRcAddict View Post
Horizontal stab install
These pics have helped me out heaps with my build thanks mate
Jul 12, 2013, 09:15 AM
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kerwin50's Avatar
I would change that quick link on that throttle. gassers don't fair while with the quick links.
Mar 03, 2014, 07:51 PM
Registered User
How is this bird holding up?
Mar 03, 2014, 10:10 PM
Registered User
My Redwing Sbach is going into it's 3rd season and 150+ flights with no sign of fatigue anywhere. Really a nice plane
Mar 04, 2014, 10:46 PM
Registered User
Great to hear!!


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