During my flight to Tzaneen again yesterday I did a low level fly pass. I did
not do a shoot-up. The speed went up to 280 mph so I pulled back on the
throttle to keep the rev's below 3200. I pulled up and took power again but
with full throttle the rpm stayed at 2200 and did not want to increase. I
planed a low power landing but on short finals the speed was still high so I
pulled the throttle closed. As I moved the throttle through 50% mark the revs
came up again and everything was normal. It is like a flat spot. It happened
during take off again when I took power and moved the throttle open it only
went to 2200 and no more. I closed the throttle and re-opened it, then the rpm
went up normal. What could cause this? The Limbach is fitted with a Marvel
Shebler carburetor and I used carb heat on the decent.
