I had my carb'd O-360 quit shortly after takeoff and traced it to a mud-dauber
nest in the fuel line on the right tank. It was fine in cruise when the fuel flow was
lower, but on full-rich takeoff the pump couldn't pull it through the partial blockage
fast enough. I'm not sure how the 206 is plummed, but partial blockages could cause
the takeoff problem.
Vapor locking does sound like a potential culprit. You don't burn much fuel
for the entire descent so any fuel in the engine compartment hangs out for awhile and
cooks.... especially with cowl flaps closed to keep from shocking the cylinders. I
wouldn't be surprised if you've got two problems, though.
-Cory
Dale wrote:
: For you guys flying injected engines.
: I'm flying a Cessna P206C with the Continental IO-520. It quite often
: will quit on rollout after landing. I'm being told that it is probably
: vapor lock causing an interruption in fuel flow. I'm not convinced.
: The ambient temps are in the 60s to 70s. The airplane is being used to
: haul skydivers so it's a climb from 250 MSL to 13000MSL, then a power
: descent back down for the landing with the engine well leaned. Cowl
: flaps are opened on base or final once the speed is down to 100IAS or so
: (this is being done to help prevent the vapor lock). Today the airplane
: cutout right after liftoff, it was as if the throttle had been pulled
: back, I noticed the fuel flow was fluctating at about 1/2 or less the
: normal flow rate for takeoff. Only lasted a moment and power returned
: before I could get the boost pump on. It then ran normally up to 13K.
: An inspection has not found anything in the fuel system (filters,
: screens, injectors, etc). Again, I was told it was probably vapor lock.
: I'm not convinced. G
: Has anyone experienced anything similar? Does your injected engine quit
: on rollout? Have you experienced vapor lock during high power
: operation? or at anytime other than start?
: I also fly a turbo-charged P206 that doesn't suffer from the "vapor
: lock" problem.
: --
: Dale L. Falk
: There is nothing - absolutely nothing - half so much worth doing
: as simply messing around with airplanes.
:
http://home.gci.net/~sncdfalk/flying.html
--
************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering Ph.D. Graduate Student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************