Search found 25 matches

by Pilot55
Mon Feb 11, 2019 1:56 am
Forum: DA40 Forum
Topic: Exhaust valve problem options
Replies: 6
Views: 238

Re: Exhaust valve problem options

Usually the valve seat problem starts with valve guide wear. The valve now does not stay concentric with the seat and when the valve is seated does not make enough contact with the seat to pull the heat out of the valve. It also puts higher point loading on a smaller area of the seat and causes the ...
by Pilot55
Sat Dec 29, 2018 1:56 pm
Forum: DA40 Forum
Topic: SureFly Electronic Ignition
Replies: 6
Views: 808

SureFly Electronic Ignition

SureFly is a company that is making an affordable solid state replacement for a magneto. I've been following them, they have an engine STC, but still need an airframe STC. I received a email from them this evening requesting EGT/CHT performance for their airframe STC. It looks like they are going to...
by Pilot55
Sun Dec 16, 2018 5:41 pm
Forum: DA40 Forum
Topic: ForcedAeroMotive: SuperCharged DA40
Replies: 287
Views: 70098

Re: ForcedAeroMotive: SuperCharged DA40

What about fuel flow at altitudes in teens? do you need to run the boost pump 100% of the time at these altitudes?
by Pilot55
Sun Oct 28, 2018 1:52 am
Forum: DA40 Forum
Topic: Low fuel pressure... again
Replies: 84
Views: 16687

Re: Low fuel pressure... again

On a flight from North Carolina to Florida at 9000 ft my fuel pressure would drop to 10 psi then up to 23 psi. Fuel flow would increase at the same time. Turned on electric pump to stabilize. This continued 6 or more times in a 2.5 hr flight. The next day at 3000 ft in slow cruise the engine stumble...
by Pilot55
Fri Oct 12, 2018 10:39 am
Forum: DA40 Forum
Topic: How smooth can an IO360-M1A be?
Replies: 25
Views: 1559

Re: How smooth can an IO360-M1A be?

The power stroke frequency is 73.3hz but the harmonics at the crank when measured will produce a frequency 95% of the time of 25% of the power stroke which would be 18 hz. I have been designing and manufacturing high performance engines for Ford Motorsports Racing for 40 years. The other forces acti...
by Pilot55
Fri Oct 12, 2018 1:10 am
Forum: DA40 Forum
Topic: How smooth can an IO360-M1A be?
Replies: 25
Views: 1559

Re: How smooth can an IO360-M1A be?

"Power stroke each 180 degrees means 2 power strokes per revolution, so the number of power strokes is double the rps (not half), or more like 73 Hz." Sorry your math is wrong. A 4 stroke engine takes 720 degrees to complete a cycle. 180 degrees for intake,180 degrees for compression, 180 degrees fo...
by Pilot55
Thu Oct 11, 2018 4:28 pm
Forum: DA40 Forum
Topic: How smooth can an IO360-M1A be?
Replies: 25
Views: 1559

Re: How smooth can an IO360-M1A be?

If your engine is running @ 2200 rpm you are turning 36.7 rps. on a 4 cylinder 4 stroke engine it has a power stroke every 180 degrees so the engines power frequency is 18 hz @ 2200 rpm. If a aircraft engine had a heavy fly wheel the pulses of the engine would be dampened and have much less vibratio...
by Pilot55
Sat Sep 29, 2018 11:30 pm
Forum: DA40 Forum
Topic: Corked Nose Wheel
Replies: 15
Views: 799

Re: Corked Nose Wheel

highest decent speed @ 6000 ft I have demonstrated with the fin attached is 165 kts in smooth air. I have had no wheel shimmy on touch down either. The fin is attached by two screws that hold the wheel fairing together. If extreme side loading was imparted on the fin it would brake the composite mou...
by Pilot55
Sat Sep 29, 2018 7:10 pm
Forum: DA40 Forum
Topic: Corked Nose Wheel
Replies: 15
Views: 799

Re: Corked Nose Wheel

At 9000 my plane TAS 148 @ 2450, 5000 TAS 155-156 @ 2550
by Pilot55
Sat Sep 29, 2018 1:34 pm
Forum: DA40 Forum
Topic: Corked Nose Wheel
Replies: 15
Views: 799

Re: Corked Nose Wheel

I measured the velocity of the air flow from the center line of the prop at different locations from the underside of the plane. I then offset the front wheel strut and fairing in relation to the center line. I constructed the fine from honeycomb core. it has very little mass. the simple test is to ...