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All Forums >> RC Airplanes >> ARF or RTF >> NitroModels Support >> cessna skylane .15 & EP
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cessna skylane .15 & EP - 2/19/2008 9:35:33 PM   
mtntopgeo


 

Posts: 176
Joined: 2/21/2004
From: Superior, MT, USA
Status: online 		I've just ordered & received the Cessna .15 & EP. Since I'm gonna power it with a "slimer" (Enya .11) All the unused openings in the firewall, including the large 15/16" one are gonna have to be sealed off. This means there will be no air flow past the engine. I intend to cut the cowl full width on the bottom, so that there will be about a 3/8" gap for an air exit. Also, the cylinder (& head) will be well shrouded, if the engine is mounted inverted, per instructions. I'm thinking that the engine should be mounted horizontally. this would put the head fins just outside the cowl, & the cylinder just behind one of the cowl's front cooling air openings. The other cooling air opening would be closed off. Nothing in the instructions pertain to this "problem." I'm bothered by the statement in the instruction manual that the plane is "ESPECIALLY DESIGNED TO BE POWERED BY a GEARED SPEED 400 MOTOR." (1), Is this just a perceived problem, in my paranoid mind? (2), If this is a real problem, are there better fixes for it, other than what I've come up with? I've searched around, but haven't found any comments on this plane. ...................... George K.
       Post #: 1

RE: cessna skylane .15 & EP - 2/19/2008 9:49:15 PM   
Mr67Stang



Posts: 2094
Joined: 4/26/2006
From: , NC, USA
Status: offline 		First of all some pictures would be great so we could see exactly what you are talking about. The statements in the manual sound like marketing for the electric guys... I prefer nitro slime myself. The main thing will be to take your time fuel proofing everything you can reach. Based on their picture of the plane it comes with the electric firewall and a nitro beam mount firewall/engine mount with a hole at the back for the fuel tank stopper to fit through... I would ude it but I imagine you are trying to keep fuel residue from getting in there. This could cause problems if the stock tank requires the stopper to fit through that hole to fit in the fusalage. I would test fit everything before perminately modifying anything. I like small nitro planes like this and would apreciate updates as you go.

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RE: cessna skylane .15 & EP - 2/19/2008 11:00:58 PM   
opjose



Posts: 5367
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		Yeah, I'd say you are worrying too much.

Just make sure to fuel proof the area under the cowl.

This is not a biggie.

IMHO it's more important to have you muffler, lines and engine nice and tight than it is to have to worry about sealing everything.

If everything is properly set up, fuel should not be dripping into the cowl area.

I have many planes which don't even get seepage from the front bearing area so the entire cowled area stays completely clean of glow fuel.

Some people seem to have problems with inverted mount engines... I have my engines inverted and cowled on practically all of my planes.

It just takes a bit more tuning to get everything right. You have a little less tolerance, that's all. Even siphoning has never been an issue for me, and I tend to use the stock tank locations with inverted engines.

Single cylinder engines don't have as big of a problem with cooling as multi-cylinder engines do.

Just make sure that you have an ample exhaust area for air travelling through the cowl. The 1 to 3 ratio of intake to exhaust is a good guideline.



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RE: cessna skylane .15 & EP - 2/19/2008 11:32:00 PM   
mtntopgeo


 

Posts: 176
Joined: 2/21/2004
From: Superior, MT, USA
Status: online 		Stang, pretty hard to get a good pic. This is the best I could; taken from the rear of open cowl, with the engine as close to the mounted position as I can guestimate. The two dark areas just below the engine mounting lugs are the fresh air inlets on the front of the cowl. As for the hole in the firewall, & the engine-mount bulkhead. It's quite a bit larger that the fuel stopper in the provided tank. I'd much rather drill a slightly undersized hole for the fuel line than try to seal fuel stopper-to-firewall excess.

opjose, Thanks for your input. Puts me a little more at ease. Still I'm a little woried about the cooling thing. Please look at the pic & give me your thoughts. I've only had 1 previous plane with a cowled engine, (Mini Super Sportster) & by the time I got through with that, it looked more like a piece of swiss cheese than an engine cowl. (Didn't have to worry about cooling!!!) Trying to be a bit cleaner with this installation.

......................... George K.

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< Message edited by mtntopgeo -- 2/19/2008 11:44:17 PM >

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RE: cessna skylane .15 & EP - 2/20/2008 1:50:00 AM   
opjose



Posts: 5367
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		I'll bet you need to get the engine just a bit forward of where you have it in the picture.

Cut around the cylinder head leaving about 1/8" around the head.

At the rear instead of following the cicular contours of the head, just open things out a bit as if you were going to form a loose curved triangle.

That will force air to flow around the cylinder head and out behind it. The area behind the head will have a lower air pressure, so it will tend to suck the air out.

As for the fuel stopper.

If things are close enough I'll use something like canopy glue to seal this area.

If there is too much clearance then I'll use one of the industrial spray foams that expand when applied. Only a little will do, but do so only after you have installed all the tubing and finalized everything. You may even want to run the engine first to make sure that you have the fuel system dialed in.

The foam expands to fill the hole and prevent fuel from getting in.

While it CAN be cut away if you need to change anything out, it's better not to have to do this, so at the very least start the engine and do your nose up/down tests...

If you are careful you can avoid the "swiss cheese" cowls.


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Build em'', fly em'', crash em'' and build more.

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       Post #: 5

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