GyrOZprey
Aussie in Kansas.
- Joined
- Aug 8, 2011
- Messages
- 3,388
- Location
- Whitewater KS
- Aircraft
- Butterfly Aurora N5560Z / Titanium Explorer N456TE & N488TE/ - trained in MTOsport 446QT/488FB
- Total Flight Time
- 1023
On a couple of occasions in the last month ... my 912 has had a very fleeting momentary power-drop on TO @ WOT! ( So brief in fact I was asking myself ... was it real ... or imaginary???? )
The first couple of times it happened ... it was so quick & fleeting ... then everything ran absolutely normally ... I thought it was just me - being neurotically hypersensitive ... & thinking ... did it REALLY happen .... well yesterday ... there was no ? ... it was definitely a very quick & real momentary drop in power at WOT on take-off ..... and seemed to reoccur as I flew the length of the runway playing with the top end of the throttle setting ... trying to get it to repeat .... just a little burp / hesitation in the power!
Max E rpm ... showing on my MGL instrument is only 5400 .... due to my prop pitch ( then @ 11.5 - @ tip) ... which I have now taken back to 10.3 (@ the tip) - about 13.5 at the 75% point .... & will see if I get my former climb performance & E rpm of 5600 back!
IDEAS ????? .....Fuel contamination ... particles / water from the high humidity!
First I'm going to install the gascolator project I've been planning for a while ( since switching to airport Mogas (from the ethanol stuff from the gas station - treated with Seafoam)
I currently have two of the round see-through mesh-screen rotax fuel filters in the fuel line ... ahead of both fuel pumps! I have never seen any particles / crud on the screens ... but they are a coarser mesh than in the gascolator.
I remember Birdy once had some crazy intermittent power drops in his machine ... turned out to be a bit of junk blocking a jet on & off! ( I'm NOT wild to tear into the carbs & have to do a carb balance again) .... until eliminating everything else!
Until I get the gascolator installed I've been draining my tanks & putting my fuel through Mr Funnel before refilling ... when the gyro has sat for a couple of weeks due to the extreme humidity we had this year!
Any suggestions?????
The first couple of times it happened ... it was so quick & fleeting ... then everything ran absolutely normally ... I thought it was just me - being neurotically hypersensitive ... & thinking ... did it REALLY happen .... well yesterday ... there was no ? ... it was definitely a very quick & real momentary drop in power at WOT on take-off ..... and seemed to reoccur as I flew the length of the runway playing with the top end of the throttle setting ... trying to get it to repeat .... just a little burp / hesitation in the power!
Max E rpm ... showing on my MGL instrument is only 5400 .... due to my prop pitch ( then @ 11.5 - @ tip) ... which I have now taken back to 10.3 (@ the tip) - about 13.5 at the 75% point .... & will see if I get my former climb performance & E rpm of 5600 back!
IDEAS ????? .....Fuel contamination ... particles / water from the high humidity!
First I'm going to install the gascolator project I've been planning for a while ( since switching to airport Mogas (from the ethanol stuff from the gas station - treated with Seafoam)
I currently have two of the round see-through mesh-screen rotax fuel filters in the fuel line ... ahead of both fuel pumps! I have never seen any particles / crud on the screens ... but they are a coarser mesh than in the gascolator.
I remember Birdy once had some crazy intermittent power drops in his machine ... turned out to be a bit of junk blocking a jet on & off! ( I'm NOT wild to tear into the carbs & have to do a carb balance again) .... until eliminating everything else!
Until I get the gascolator installed I've been draining my tanks & putting my fuel through Mr Funnel before refilling ... when the gyro has sat for a couple of weeks due to the extreme humidity we had this year!
Any suggestions?????