Boots
Active Member
0320 160hp.
Do you know the owner, Is it smooth with that prop?0320 160hp.
Yes....very smooth with the airboat prop.Do you know the owner, Is it smooth with that prop?
wolfy
Thanks mate, I would also imagine his prop is balanced but I was wondering about the two per rev pulses.Yes I do know the owner .
He is a well known builder and I would assume his Prop is balanced .
Cheers mate, sounds like you have flown it?Yes....very smooth with the airboat prop.
The reason why most gyros go to a 3 blade prop is due to limited space for longer props. The less blades.....the more efficient the prop. Multiple blades means each blade is traveling through the prop wash (disrupted air) of the previous blade.Thanks mate, I would also imagine his prop is balanced but I was wondering about the two per rev pulses.
Seems to be the culprit for a two blade being less smooth than 3+ blade props.
wolfy
Not that I'm aware of....due to the blade being more efficient.....but I'll leave that to the experts we have here on the forum.@ultracruiser41 if one has less blades (on a prop) does the blade cord need to be bigger ie cord on a 2 blade 50% bigger than a 3 blade ?
phil
Yep agreed.The reason why most gyros go to a 3 blade prop is due to limited space for longer props. The less blades.....the more efficient the prop. Multiple blades means each blade is traveling through the prop wash (disrupted air) of the previous blade.
Some gliders use a single blade prop with a counter balance.....very efficient prop.
Go on, give the mono blade a go. It looks rather unusual.Yep agreed.
Less blades more efficient, more blades usually considered smoother.
My reason for asking was only about smoothness as I am going to try a two blade to be more efficient.
wolfy
Best lookin gyro thereBy the way, that second picture 'flock-of-gyros' looks photoshopped... but being the one in the top right with the orange shirt, I can vouch for the fact that it is very real... and fun as heck!
The folks who didn't make it to this one missed a heck of a fly-in!!
M
On the flip side, more blades = less burden per blade. In order to go with only two blades with this much HP you'd think you kinda need something wide and beefy, like a Whirlwind flat bottom airboat prop or the enormous wooden spoons on the Twinstar gyros seen at Mentone every year.The reason why most gyros go to a 3 blade prop is due to limited space for longer props. The less blades.....the more efficient the prop. Multiple blades means each blade is traveling through the prop wash (disrupted air) of the previous blade.
Some gliders use a single blade prop with a counter balance.....very efficient prop.
But I don't think I've ever seen a Lyco running a thin profile, 3-blade Warp, NR, etc. Thangs that make ya go, "Hmmm."
I dunno.......most every aircraft I’ve own or flown has a Lycoming with 2 blade props.....pretty standard and must work well.......been doing it for many, many years.The 4 cyl direct drive aircraft engines have huge cylinders, and produce large power pulses. In one revolution of the prop, there are only 2 power pulses, compared to many smaller pulses for a geared engine. Props take a lot more abuse for the low RPM direct drive LyConts.
Rusty