Metal prop performance

[btbell]

Hello all,

I wanted to get feedback on which metal props people were using on their '46 BC12Ds with an A-65. I may be in the market for one. Specifically I am looking for climb performance (FPM) and cruise speeds. I am also interested in how many static RPMS you are getting. I currently have a 74CK44 prop installed that is borrowed from a friend. It climbs great but sacrifices about 5 -10 MPH on criuse from the 74CK46 I used to run. I have a friend with a 74CK45 I may try later this month.

Thanks,
Brian

[Pearson]

Re: Metal prop performance

Brian,

I have the McCauly 7445 on my otherwise stock BC12D. It spins up to about 2050 rpm static, with a good strong engine. That picks up about 100 RPM as I streak down the runway. I don't know what my rate of climb is because I don't have an indicator and am too lazy to measure it with a watch. Besides, it varies so greatly with temperature and weight that you just have to take what you can get. I cruise at 93-94 statute when it is just me and about 12 gals of gas. Load it down "heavy" and that will go down to 87-88 mph.

[flyguy]

Re: Metal prop performance

Streak down the runway eh, pretty funny.
DC

[Guest]

Re: Metal prop performance

Hello all,

I wanted to get feedback on which metal props people were using on their '46 BC12Ds with an A-65. I may be in the market for one. Specifically I am looking for climb performance (FPM) and cruise speeds. I am also interested in how many static RPMS you are getting. I currently have a 74CK44 prop installed that is borrowed from a friend. It climbs great but sacrifices about 5 -10 MPH on criuse from the 74CK46 I used to run. I have a friend with a 74CK45 I may try later this month.

Thanks,
Brian

Hi Brian-

I am a little confused by your statement, I recall 72CK44 being a wood prop.

But for what its worth I use a McCauley 1B90 CM7049 and it climbs and cruises really well. Cruise is about 99 mph. Need a feild approval but that's pretty easy.

Dave

[Darren Lucke]

Re: Metal prop performance

Wow, what's manifold pressure running that 49?

[Pearson]

Re: Metal prop performance

A 49 pitch on my little A-65 would lug it down so much I would probably never climb out of ground effect.

[Ragwing nut]

Re: Metal prop performance

I prefer McCauley 71-48 metal for 65/75 installations. We have ran quite a few of them and would indicate about 105. I also rigged our airplanes for speed as well.

Mike

[Guest]

Re: Metal prop performance

Notice the diameter is 70", static rpm is within limits, climb is better than wood prop, engine is A65

[Larry Lyons]

Re: Metal prop performance

I prefer McCauley 71-48 metal for 65/75 installations. We have ran quite a few of them and would indicate about 105. I also rigged our airplanes for speed as well.

Mike

WOW, I like those numbers. All though I am not in the market now, how hard is it to find that prop? Will that combo pull a T-Craft out of a 2000' grass strip at 710' MSL safely?
Larry

[Ragwing nut]

Re: Metal prop performance

WOW, I like those numbers. All though I am not in the market now, how hard is it to find that prop? Will that combo pull a T-Craft out of a 2000' grass strip at 710' MSL safely?
Larry

71" props are fairly common, I fly off a 4000 ft strip but use about 1200 ft all the time. You have to understand to run 105 indicated you have to be able to get it up on step and hold it there or it will only indicate about 95.

Mike

[tawadc95]

Re: Metal prop performance

mine is a sensenich 72x42 wood on a 75 hp L2M and go out of a 800' grass strip with orchard trees at both ends regularly.

[tawadc95]

Re: Metal prop performance

oops...forgot to mention 100'msl, but 100 degree days and solo

[Dano"T"]

Re: Metal prop performance

My dad's BC-65 with 74-45 McCauley MetL will climb out of our 1000' strip without trouble with me 200lbs and him 265lbs without too much pucker....we're at 600msl. There is an approach cut through the trees at 1 end but we are always over the treeline by the time we get to it. Cruise id about 90MPH

[dedrekon]

Re: Metal prop performance

Dano,
Sounds you're only carrying about 3 gallons of fuel! Actually I agree with your numbers. I fly in and out of 1400 feet all the time at FULL gross with trees on each end....and it's no sweat at all, even on hot days.
I have a McCauly 7445 and get close to 100mph cruise if I get all trimmed out up around 6K (you DO have to get it on the step as Mike says....not sure what that means, but you'll feel it when it gets there).

v

[Ed O'Brien]

Re: Metal prop performance

Has anyone tried the "ground adjustable" type of metal prop? If so, what type of performance can one expect?
What is the weight penalty? Thanks for this discussion.
With regards; ED OBRIEN