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Hi Bill,
Glad you got it running. Plugs can really be a pain with fouling and what.
I sure hate to burst your bubble, but I don't think you are close to 257 HP. I have a 74x88 and I can produce close to 190- 200 HP on a good, cold day and I can spin the prop at 6000- 6200 static. So a 2 blade 76x88 at 4200 rpm max static just is not an indication of 257HP. Sorry.
If you are basing your HP calculations based on your fuel flow, You may have still it too rich. The rotary can eat a lot of fuel before stubbing but past a certain point, its just blowing through the chamber and burning in the exhaust - not producing power. Trying leaning it until you start to lose rpm while at 4200 and as soon as rpm starts to drop - note your fuel flow at that point.
Ed
----- Original Message ----- From: "Bill Bradburry" <bbradburry@allvantage.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, February 22, 2007 4:10 PM
Subject: [FlyRotary] Flooded plugs
I am gradually learning how to start my engine. When I began, I started with a couple of taps on the primer and with the mixture set full rich. I flooded the engine and that started a cycle of remove plugs, blow the fuel out of them, fiddle with the mixture, cold start, or primer, then try to start, remove plugs...etc..
I was getting pretty frustrated....So I called Tracy!
One of the things he suggested was trying new plugs...So I bought a set, but decided to clean the Renesis plugs in a sand blaster and try them one more time.
I also decided to set the mixture about 1:30 instead of full..no joy...I moved it to about 2:00...It tried to start!....I moved it to about 3:00...RRRIIIPPPPP! Yea!!
I had been using too much fuel on my starting attempts and, as I read in the archives, sometimes when the plugs foul, they will need a good cleaning or replacement. Tracy tells me that sometimes after you get the engine running with good plugs, it will also run if you put the bad (cleaned) ones back in.
Now...Who knows what factors affect the HP calculation that Tracy uses? I still do not have the engine mixture properly trained, but I decided to check my static RPM today. 2 Blade Performance prop..76X88. I only got about 4200 RPM, but the HP at one time was at 257!!! :>) Without the cowling on, the prop blast is directly into the throttle body and at one time I also saw 31.5 inches of manifold pressure!!
This could turn into a lot of fun! I need to get back to trying to build the plane..:<(
Any and all thoughts are welcome!
Bill B
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