I had the same thing happen many years ago while doing a first flight on a friends KR-2.
Ran good on the ground and on climb out but, when I picked up speed, it would just die down. Landed Ok. It was a Posa carb and was adjusted lean on the ground but when we picked up speed, the ram air made it even leaner. Was good after adjustment. Sparky Sent from Windows Mail From: Mark Langford via KRnet Sent: Monday, April 20, 2020 6:18 PM To: Flesner via KRnet Cc: Mark Langford Larry Flesner wrote: > I'm wondering if this is something I want to be flying behind at my Just a reminder....make dang sure it will run wide open for at half a minute before you commit to a takeoff! If it'll do that, you'll probably get enough altitude to turn back, especially if you climb out at a 30-40 degree angle, to make it easier to circle back if you have to. This is something I give a lot of thought to! And even that's not a guarantee. Jim Hill once redid his cowling engine air inlet to get ram air into the Posa carb. Ran fine on the ground at WOT, but once he got up to speed on climbout, the engine starting missing and then quit entirely! He was barely at pattern altitude, doing something like a downwind, and the runway was "one-way" then (for a KR) due to tall trees on one end. That was his only option though, so he came over the tall trees and crabbed a much as possible (no flaps)....said he barely touched the far end of the runway as he skittered out into the cotton field, hitting a ditch, flipping it over, and breaking the tail off the plane. The engine ran great back in the hangar. What we figured out was that the high inlet pressure into carb throat had introduced a higher pressure into the float bowl vent, effectively reducing the fuel flow into the intake by overpowering the low pressure area that's normally sucking the fuel into the inlet tract. For more on this, and how Jim rebuilt his stock KR2 into a KR2S in the process, see http://www.n56ml.com/jhill.html . We also took the opportunity to lengthen his horizontal stabilizer, and used my airfoil templates to rebuild the vertical stab and rudder. So he was the first guy to fly it, and loved the difference (part of which was also the extra "S" length). I think you'll agree from the photos that he did a pretty good job hidding the stretch, and all he did was splice the length into the longerons and nicely bridge the gap when covering with plywood. Mark Langford m...@n56ml.com http://www.n56ml.com _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
