Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

engine porting

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Old 11-17-2007, 10:46 AM
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vasek
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Default engine porting

i am looking for info on porting; Schneurle, laminar flow (ST)

info & pics would be great

thanx
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Old 11-17-2007, 11:47 AM
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Default RE: engine porting

http://www.google.com/search?hl=en&s...+flow+&spell=1

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Old 11-17-2007, 01:27 PM
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Default RE: engine porting

Interesting, Duke Fox being the individual with this patent.
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Old 11-17-2007, 01:55 PM
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Default RE: engine porting

....what patent ?
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Old 11-19-2007, 04:23 PM
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Default RE: engine porting

gas or nitro?

revver bro ... i forgot my #
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Old 11-19-2007, 04:55 PM
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Default RE: engine porting

nitro
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Old 11-19-2007, 05:14 PM
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Default RE: engine porting

Look here http://www.freepatentsonline.com/4638770.html
This is Duke Fox's application.
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Old 11-19-2007, 10:33 PM
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Default RE: engine porting


Liner and shaft timing are somewhat important, but look at what you can do at BDC to unshroud the boost ports. If you take notice, the piston skirt on most engines interferes with the easy transfer of gas at BDC. The trailing section of the cranks' counter weight can also be dished to assist flow into the forward boost port, this also helps smooth out the engine after you've notched the piston skirt and oval sectioned the rod. Another tip that has nothing to do with porting but will increase pumping action [volumetric efficiency] is to go with a Cyclon style backplate to decrease crankcase volume.
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Old 11-20-2007, 03:02 AM
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Default RE: engine porting

Combat, OK, i found some info on "cleaning" the ports

-am still confused on the notches in the piston sleeve. I've seen it on the left side of the port & on the right hand side also. (?)

-if the counter weight is reduced, wouldn't it unbalance the engine?

-what is Cyclone backplate?
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Old 11-20-2007, 08:56 AM
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Default RE: engine porting

not to worry about balance ... take an unbalanced prop put engine at TDC let heavy blade of prop fall to bottom and tighten
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Old 11-20-2007, 10:57 AM
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Default RE: engine porting

Here's something for ya:
http://www.rcuniverse.com/forum/m_5226191/tm.htm

There's some good/useful information...and a bunch of B.S. but if you're interested in doing some reading, it'll give ya something to do...
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Old 11-20-2007, 01:29 PM
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Default RE: engine porting

That's a keeper! thanx top
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Old 11-20-2007, 09:56 PM
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Default RE: engine porting

Vasek, at either the Cyclon website or at the MACA [control line combat] website there is a photo essay about how the Cyclon .15 is built. These engines are amazing to see in action.
To visualize what I said about improving intake transfer into the boost ports, take off the back plate of your favorite engine and take notice of how the path for gas flow into the ports could be improved. I made a mistake earlier about which edge of the counterweight to dish out, it is the edge that immediately follows the crankpin after the piston goes past TDC on the down stroke, this is when you want the shape of the counterweight to help direct gas flow up into the boost port. If you have lightened the piston and rod, then removing material from the counterweight is a good thing. It isn't rocket science, just cut and try will do. The notches in the piston skirt will lighten the piston significantly. The piston will need to go into a holding fixture and vertically mill the excess skirt material away so you can keep the angle of the cut away from the exhaust port [instant ruined engine] and so the angle of the cut lines up with the direction of the boost ports.
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Old 11-21-2007, 05:17 AM
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Default RE: engine porting

Yeah.Combat NICE little engine! i like the minipipe!!!

i would love to see the Jett inners to see the porting on it

any pics of that? (i've got 2 lx'ses but don't want to take'em appart)
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