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Old 09-14-2017, 12:59 AM   #1
Dana
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Default Propeller for SA100 / 0-290

I'd like to replace the prop on my plane. Nothing wrong with it, the plane performs just fine, but it's an O-290G and there's a note in the aircraft papers saying "aerobatics not recommended" due to the thin flange (it does have the reinforcing plates). I’d like to replace it with a wood or composite prop to put less load on the thin flange of the -G engine. A lighter prop will also help with the aircraft’s nose heavy condition.

I'm actually not sure what I have right now.
I can find no markings on the propeller, though I haven’t removed the prop so I don’t know if it’s marked on the front or back face. The initial entry in the aircraft logbook says M-76AM (incomplete part number?), s/n 50-184. Elsewhere in the aircraft papers there is a 1984 receipt from Pacific Propeller for repairs to a 74DM6-0-58 s/n A43409, though there's no mention in the logs of the prop being replaced. There is a log entry stating the prop was reinstalled after being reconditioned in 2007, but no mention of model or serial or who reconditioned it.

I measured the prop at 72” diameter and 61” pitch, blade angle measured on the back face with a Warp Drive protractor 27” (75%) from the centerline. That angle at that distance could also mean it's a cut down 76x58 prop.

Cost wise (I'm always broke) it could be a wash if I sell the metal prop.


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Old 09-14-2017, 01:45 AM   #2
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I thought it had 72x61 on the hub. It can be twisted, but that will not help with the weight. Watching Barnstormers, props seem to come in waves. I have seen it flush with good prices and seen few for a mint. Just have to be ready to pounce. Most props are certified which means there seems to be not a lot of different pitches compared to possibilities. .


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Old 09-14-2017, 03:04 AM   #3
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I'd call Catto. I bet he could build you exactly what you are looking for. Or Prince or Performance Propellors. Maybe there's a few more? But if it was me...Catto. I was very disappointed in Sensinich ground adjustable I installed on a RV-8 buddy's plane. Maybe Whirlwind ground adjustable like Saber has on his Starduster Too would be one to look at?
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Old 09-14-2017, 03:38 AM   #4
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Catto if you want to spend a lot on quality or Performance Propellers if you want affordable quality. Opinion.
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Old 09-14-2017, 03:45 AM   #5
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Theres always the VAF classifieds but mostly props for larger engines, always find sizes available for the RV4s.

This is NOT my add.

http://www.vansairforce.com/communit...d.php?t=153236
Aymar Demuth Wood Prop for Sale
I've had an Aymar Demuth Wood Prop for Sale 68 length, 74 pitch, SN 93219, Made in 1999. Has about 350 hours on it. I put on a composite prop. It has spinner and extension for a Lycoming IO320.
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Old 09-14-2017, 10:18 AM   #6
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What I'm really looking for is what size and pitch, what do others use with this plane/engine combination. I could get a Sensenich wood prop, though I've always heard good things about Performance Prop... Frank there was considered "the man" for half VW props, too.
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Old 09-14-2017, 10:52 AM   #7
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Dana,
I just installed a Sterba wood prop...72-56 on my O-290-D. Static rpm is 2100. I obviously haven't flown with it since my wings aren't finished! Got it for $275 from a fellow I met at OSH 2016 at the Starduster meeting at freerangequark/Glenn's Charger.
The Sterba weighs 12.6 lbs, compared to the Sensenich 74-DM6-0-56 at 32.6 lbs. This is part of the weight reduction I'm working on...150 lbs so far.
Hope this helps.
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Old 09-14-2017, 12:56 PM   #8
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Those 76AM series props are 74" long new. I don't know why the "76"? I run one on my Tu-holer, 76AM6-50. I does pretty well with a static of 2300 rpm. It turns about 2450 in a 80 IAS climb resulting in a 105 IAS cruise @ 2400 rpm. Apples/oranges comparing to a biplane but static would be the same.

You have to be very careful comparing different props, manufacturer and wood vs. metal. I have a 74 X 50 wood Culver, same length and pitch as the Sen. 76AM6-50.
It resulted in a static of only 1900 rpm, terrible climb @ 2100 rpm and would only turn 2250 WOT. I should have aborted the take off.

I tried it on the Acroduster 2 and it preformed almost exactly the same as the metal 74DM6 -58? Really strange IMO ???

Jack


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