bonal Posted May 24, 2014 Report Posted May 24, 2014 Saw this pic in AOPA e-news and was wondering what kind of prop is that. I've seen similar on air boats and LSA but never on something like that. Personally I think it looks kind of cartoony especially when compared to the 4 blade that it replaced. Thoughts any one? How bout something like that on a Mooney. Quote
Ned Gravel Posted May 24, 2014 Report Posted May 24, 2014 I think this is the scale replica of a P51 (called a "T51"?) that I saw in Oshkosh once. I am not sure it ever had a four-blade prop on that engine, but I could be wrong. I agree it looks a little strange, but an aeronautics engineer could probably explain way better than I why six blades fit for what this engine delivers. Quote
bonal Posted May 24, 2014 Author Report Posted May 24, 2014 Thought it might be a T51 prop design has always fascinated me. To me the prop is the most visually important element of an airplanes looks. Quote
Cody Stallings Posted May 24, 2014 Report Posted May 24, 2014 Looks like a ground adjustable whirlwind or Sensenich Quote
Bob_Belville Posted May 24, 2014 Report Posted May 24, 2014 Looks like a ground adjustable whirlwind or Sensenich Cody, curious, when you "ground adjust" such a prop does the pitch of each blade remain the same? IOW, could 3 blades be set to optimize take off and the other for cruise? Quote
Cody Stallings Posted May 24, 2014 Report Posted May 24, 2014 No Sir... All blade angle must stay within 2 tenths of a degree from one another. The difference between climb angle to cruise angle could be as much a 7 pitch inches. In the center of the hub there will be an adjustment that you can turn that will allow you to flatten the pitch(climb) of all blades in the assembly, or increase pitch(cruise). It takes longer to remove the spinner than it does to make the angle change. 1 Quote
N201MKTurbo Posted May 24, 2014 Report Posted May 24, 2014 It appears that there are four exhaust stacks indicating a V8 auto engine. Perhaps this propellor is a high reving prop so you can direct drive it from an auto engine. Quote
Cody Stallings Posted May 24, 2014 Report Posted May 24, 2014 Watched this one crash in a field south of DKB last yr. it had a 4 cylinder Toyota engine Quote
Cody Stallings Posted May 24, 2014 Report Posted May 24, 2014 Trapped inside..... Rough day....... Spit all the connecting rods out on takeoff of first flight Quote
Marauder Posted May 24, 2014 Report Posted May 24, 2014 Trapped inside..... Rough day....... Spit all the connecting rods out on takeoff of first flight ?? Explanation please! Sent from my iPad using Tapatalk Quote
Cody Stallings Posted May 24, 2014 Report Posted May 24, 2014 Not really sure. I was told afterwards by my customer up there, that the oil pressure dropped after he took off.... Pilot was getting medical attention when I looked at the plane back at the hanger. So I don't have the facts. But it sure punched 4 holes in the block, cowling was full of connecting rods, an crankshaft chunks..... Quote
bonal Posted May 25, 2014 Author Report Posted May 25, 2014 Cody, it sounds like you know a thing or two about props. Do you or any one know the range in pitch from full in to full cruise at say 2400 to 2500rpm. And how is it measured I remember during my speed boating days a prop was measured by how many inches forwards the prop would move with every 360 degrees rotation not counting the percentage of slip. Quote
Cody Stallings Posted May 25, 2014 Report Posted May 25, 2014 It's though to say what the pitch would be. Because it is always changing. A fresh powerful engine would pull more + blade angle than a worn out engine at a givin power setting..... In theory a propeller once unloaded will cork screw through the air. I'm sure there has to be a percentage of drag that slows it's forward motion, but I'm not that smart. I'm more up to speed on the mechanical components of the propellers. Quote
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