Norvel .061 and the tuned pipe
10-28-2006, 11:46 AM
#26
RE: Norvel .061 and the tuned pipe
JM, those engines exhaust at about 4:00 instead of 6:00, but a slip fit header with a silicone O ring would work on the exhaust stack. A complication is the rectangular stack. I don't think the gains to a Cyclon would offset the added weight, plus are you willing to raise the exhaust timing of a $200 engine just to see if it works?
10-28-2006, 04:55 PM
#27
RE: Norvel .061 and the tuned pipe
Pigg,
I believe the cyclon comes in a true rear exhaust varient (or did) which would appear to be for the attachment of a pipe.
Lets be real here: there is not going to be any real need for more power from a cyclon, But I`d still do it just to cut the sound down and keep the duct cleaner.
And besides, I like the sound[8D]
Stefan
I believe the cyclon comes in a true rear exhaust varient (or did) which would appear to be for the attachment of a pipe.
Lets be real here: there is not going to be any real need for more power from a cyclon, But I`d still do it just to cut the sound down and keep the duct cleaner.
And besides, I like the sound[8D]
Stefan
10-28-2006, 05:40 PM
#28
RE: Norvel .061 and the tuned pipe
JM, Ya..I could see the usefullness of a sheet aluminum duct to carry exhaust away, even if it was shaped like a megaphone to increase loudness, then that would be even better.
It is hard enough to match airframe/prop/pipe with a conventional prop plane. I would not want to go through the same process with a ducted fan, [if speed is the object here, not just rpm]. I would rather throw in a .074 with the same fan as the .061s' and go for predictable gains that way. As far as I know, no one has tried to convert a .074 to AME type porting.....I think that is a project worth looking into.
It is hard enough to match airframe/prop/pipe with a conventional prop plane. I would not want to go through the same process with a ducted fan, [if speed is the object here, not just rpm]. I would rather throw in a .074 with the same fan as the .061s' and go for predictable gains that way. As far as I know, no one has tried to convert a .074 to AME type porting.....I think that is a project worth looking into.
10-30-2006, 06:44 AM
#29
RE: Norvel .061 and the tuned pipe
I would probably vote aginst it. I did something like that, but there was a problem at high rpms at bdc the rod little end tended to move over to ones side of the piston, angling the rod and loading up one side of the piston skirt. This seems especially pronounced at bdc as the piston is almost halfway out of the cylinder skirt, and is so even more cock-over and creat a lot of friction and unhappyness.(it stays to one side at tdc too, looking at the wear scar) I took out the pin and installed little bushes to keep the rod central in the piston.
You are right about a cyclon in DF with prop load problems. One would need to be gear driven to work at max power, otherwise a piped norvel 061 would put out almost the same power direct drive with the optimum fan.
Stefan
You are right about a cyclon in DF with prop load problems. One would need to be gear driven to work at max power, otherwise a piped norvel 061 would put out almost the same power direct drive with the optimum fan.
Stefan
