small holes drilled in prop

[RodneyPierce]

bigger round one if I recall correctly? full 360* instead of 45*

 

[Jim Allen]

bigger round one if I recall correctly? full 360* instead of 45*

Excellent observation Rodney!

 

[hugh hargett]

B)

 

[steve wood]

bigger round one if I recall correctly? full 360* instead of 45*

that was the first one.it got pitched(hah) for one that is 60°.now they are 45°,with more steps.they are easier to use than the one andy uses,no spacers required.

 

[dwilfong]

When I read this it became very clear what is what.

Thanks Andy you have a very simple way of explaining things

David

 

[hugh hargett]

 

[Andy Brown]

bigger round one if I recall correctly? full 360* instead of 45*

that was the first one.it got pitched(hah) for one that is 60°.now they are 45°,with more steps.they are easier to use than the one andy uses,no spacers required.

Yes, The first one was full 360 and solid, but I could not operate it because the "Big Plate" was in the way. It needed to be cut out so I could control the arm from below. Also did not need 360. I sent it back to Steve and he made that part 90* with a cut out inside. So, actually the one I have is 90*. It still measures props everyday!

 

[Andy Brown]

When I read this it became very clear what is what.

Thanks Andy you have a very simple way of explaining things

David

Thanks for posting David! I better save that!...just in case I forget what I used to know! LOL

 

[dwilfong]

When I read this it became very clear what is what.

Thanks Andy you have a very simple way of explaining things

David

Thanks for posting David! I better save that!...just in case I forget what I used to know! LOL

I have it saved on my computer so I can refer back to it.

It's hell when you get older. beleave me I know.

 

[RodneyPierce]

Thanks David for posting that! And thanks Andy for sharing!

Nice calculation there! Do you not have to worry about slip then? I assume the props are always going to slip some?

 

[hugh hargett]

Its good within 3% . Still wondering how you take leading edge numbers with only 45 degrees of swing???? If you can not what good is a gauge with only 45 degrees of swing?

 

[RodneyPierce]

Hugh, why do you need 45* of swing???? When most measurement is done within a 5-10* increment anyways (on an Orlic gauge anyhow).

Curious why you think you need 45*? No pun intended. Just curious

 

[hugh hargett]

Rodney have you been able to read LE edge pitch numbers with your 45 swing gauge without charts or veneers? You were supposed to try some time ago dont remember you ever posting results. Do that first then tell us . Before this thread all you were measuring with your gauge is trailing edge numbers.

Even more beautiful is the fact that the guage offered here by MS (your type) is not indeed the one Andy brown uses.

 

[hugh hargett]

Hugh, I dont take leading edge measurements with mine. Im not sure if you can or not. But I assume it would work the same way? Ive never messed with leading edge to be honest.

You never messed with the most important aspect of a prop!!!

Teach me please.

Thought you were using your "heads up tools" ??? :lol:

 

[hugh hargett]

heres some help for you

Pitch= depth difference of probes X 360 degrees / the measured angle between the probe points

What did you find when measuring LE with your gauge Rodney?

if you knew the radius from the center to the probe point and knew the linear distance between your two probe points you could find the unknown angle using triple side trig formula.

The radius can be assumed to be 2/3rds of your props diameter or apprx 70% out or whatevers appropriate for blade numbers.

 

[RodneyPierce]

Hugh, I have not measured the LE of the prop yet. I have not got around to it. Ive been using TE pitch and doing it all wrong apparently right? Apparently Im wasting my time there?

 

[hugh hargett]

With whats been said here and abroad about props you can decide for yourself if only knowing the TE is important. For me in my "school of thought" a gauge that cannot effectively measure leading edge pitch is useless. You are of a different school, so I dont know if your wasting your time, but you are wasting mine, with questions you can answer for yourself as soon as you take some LE numbers with your gauge. Only takes a minute with the right gauge.

Or you could try the "heads up" approach .

Later

Hugh

 

[RodneyPierce]

yep

 

[dwilfong]

Rodney

Put the pin in the 25deg hole.Stick the pointer on the leading edge. them move the gage to the 0 stop. now 0 out the dial indicator and then move to the 25deg stop and check the reading.

Do this at the 70% out from the hub.

now you have the number that matters.

David

 

[dwilfong]

Here is a pic of the mapping of a stock ABC2818 prop done with the FO gage.

When you get to 45 deg gust loosen the nut holding the prop and move back to 0 keeping the dial indicator at 0. then tighten the nut and go to the end. add the measurements and deg as you progress.

David