metal prop bolt torque

[ClipWing_T]

What is the bolt torque specs for a metal prop on a 0-200 ?
I have a 69-50 that turns 2800 rpm in a shallow climb!
Surely, this prop has been re-pithced and not marked properly.
I have a fresh overhauled 69-48 and want to try it tomorrow if
I can. The 69-50 is on a J-5 Cub.Hope to have my clipwing T-craft
finished this year but i've been saying that for long time . lol

thanks, Mike in Texas

[Forrest Barber]

Prop torque is an airframe manufacturer recommendation. If you have a clip & do snap rolls, I would use 35 ft-lbs. A wee bit over Cessna 150 manual. the bolt has to be pre loaded so it does not act like a spring..... that 69-50 sounds bit fine. What is the rpm & airspeed, wide open level flight..... let us know about the other prop....

[ClipWing_T]

Thanks, Forrest, for the information. I put the 69-48 on the Cub
and the static rpm was 2700 on the ground. In the air, I can run the rpm's to 3000, that's why I think the tach is reading wrong. I have an electronic tach for model engines, but it may not read the lower rpm's very well. I think I'll try a diffrent tach and see what happens. The airplane really gets off the ground nicely and
climbs strong. There's not much difference in the airspeed, but a Cub ain't no T-craft either. We used to call our T-crafts,
"T-Jets". They would run off and leave most other planes on the same horsepower, but, you know this already. A friend of mine, Bill Walker, from Bohnam,Texas bought a new 100 hp Taylorcraft in 1973 . What a plane! One day he came over the airport at pattern altitude and did eight loops in a row from level flight, and hooked me forever as a T-craft lover. Bill used to ferry new Taylorcrafts back in the forties and was a dealer at one time. He told me a story about the time he and a buddy ferried two new planes back to Texas. Some place over the Midwest, his friend needed to go really bad, but he didn"t know this (no radio). Any way, he looked over during the flight and his friend was dumping something out of his shoe! A misty spray went all over him and the plane. When Bill figured out what was going on, he said that he laughed all the way home. Oh yes, they thouroghly cleaned the customers new plane when they got home.
Thanks,Mike

[Forrest Barber]

For sure you need a accurate tach.... At night face the ship away from about any light source & the blades will stop at 1800 PRM, 60 cycle lights you know..... & other multiples too. Yes that prop is a bit fine....but not that fine..... I too have used my shoe but got it out far enough before dumping.... another friend used the First Aid kit box for #2 ; wheewww what a mess....

[Robert Lees]

60 cycles...Hertz, you mean (but at least we get more oz per gallon than you cheapskates)

Oh yes, unless you are in Europe, where we operate at 50 cycles.

We use flourescent tubes over here to calibrate all sorts of equipment because (under International Standards) they have to be accurate within a miniscule amount of percentage points...

...well certainly enough to get the correct rpm for a 2300 prop...

Rob "50 cycles rules" Lees

[Forrest Barber]

blimey two great countries separated by a common language, strange electric and VHS that won't play over here in the Colonies......keep up the good work...... cheers