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Wood/composite prop wanted

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O320 160hp aerobatic monoplane, current 72/66 wood prop too coarse, climb at 100 mph at 1150'msl 2150rpm, static 2050, 160mph wot at 3000'msl 2700rpm. Want better climb. I think I need something finer. Dont want metal prop.
Any/all advice, recommendations, offers encouraged.

Mike Warbington
 

Acrobum

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Give Don over at Sensenich in plant city, FL a call, tell him Nick sent you! I have one of their prop on my Pitts, very very happy with it!
 
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I have a chance to buy a wood Sensenich 74/58, but am concerned it may be too fine.
My airplane performs at speeds similar to a Pitts, has less wing area but a thicker wing section. The 72/66 nets me 140 kts at 2700 rpm at full throttle at 3000'msl consistently; I checked it again a few days ago. Climb is sluggish at 22-2300 rpm at 110 kts.
What do you think of the Sensenich 74/58 for my airplane?
 

EAABipe40FF

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I have a metal Sen. 74X58 on my IO320-160 and get a static of between 2350-2400. 100 mph climb @ 2550 rpm. IMO much closer to where you want to be.

The nominal prop for a 150-160 horse Pitts is usually a 74X56. That's what I had on my S1C(metal). 100 mph climb would yield 2700 RPM and 2500 fpm. Exactly what you look for in climb...rated power RPM at best ROC speed.

2050 static is pathetic You may have a propeller intended for a Tailwind, T18 or another fast mover although they may even be shorter/coarser?

If you want climb 74X58 may even be too coarse?

Or I could be wrong.

I know one thing, 2000 static is scary when pointed down a short grass field. I purchased a Culver 74X50 to try on my Spezio. Static was only 2000 but I tried it anyway. I should have aborted the TO but I had gone too far. I made it around and over the trees, climb was about 200 fpm. I got to 400' agl by base. I run a 74X50 metal 76AM series Sen. on the Spezio but this Culver is thicker probably meant for a O320 and the O290 didn't have enough power to turn it.

I've been tempted to bolt it on the IO320 and see what static is but I couldn't fly it for W&B reasons so why bother.

Good luck. It would be good to be able to try before you buy. OTOH the suggestion to call the guy at Sensenich is a good idea.

Jack
 
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Thanks for the input.
What speed do you get straight and level with your O320 160hp and 74/58 prop? Biplane?
 

EAABipe40FF

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Thanks for the input.
What speed do you get straight and level with your O320 160hp and 74/58 prop? Biplane?

Yes Biplane. Acroduster 2. WOT 2900 RPM and 150 mph.

2500 RPM cruise yields 125 mph.

Much more drag/heavier than S1 Pitts or your monoplane.

Jack
 
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I am very grateful for the information.
I would really be fun to fly my little airplane at full power in a climb.
Maybe I should try this 74/58 Sensenich wood prop.
I have a Smith Miniplane, also. Havent flown it in ten years, but do remember its top speed wide open straight down was 150mph. Tight fit, but flew like a dream. lots of fun.
My little airplane is much lighter and less draggy than a biplane. Mine does have less wing area.
My brother-in -law, RIP, told me a long time ago flying an airplane is the most fun a guy can have with his pants on. He is right.
 
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I put a 74/61 aluminum Sensenich prop and got 182mph IAS at 5000DA at 2850 rpm wot at 12.5 gph. Climb rpm increased acouplehundred rpm. Static was about 2050. More testing soon. Wow.
 

Lotahp1

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I'm guessing you need to check the airspeed accuracy??? Or that's the Fastest Smith mini plane EVER. 182mph!!
 

Lotahp1

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Ohhhhhhh. Ok. I thought I might be missing something 😅
 

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