prop Rotation
#2
Chris
Gold Member
It runs considerably better with the standard (right spinning) props. I have tried spinning the props in both directions on a Heat.
I don't know the physics behind why this is.... it just is.
Chris
I don't know the physics behind why this is.... it just is.
Chris
#3
Registered
The helm is on the right to counter balance right hand prop torque in 90% of the recreational boats made. If you ran left hand rotation (particularly running by yourself) the boat would lean seriously to the right (starboard) under power, negatively affecting handling.
Exceptions to the starboard helm rule are center cockpit race boats (F1s and drag boats/circle and drag hydros), center console offshore fishing boats, and offshore cats. With the exception of F1 race tunnels and hydros, the others generally have multi engine and drive setups that cancel propeller torque through counter rotation, making them less sensitive to helm placement.
The Heat will still torque roll to the left even with the helm on the right. I try to eliminate it by running approximately 1/4 tank more gas in the starboard tank. You can tab it out, but that usually slows the boat somewhat.
Regards,
Steve
Exceptions to the starboard helm rule are center cockpit race boats (F1s and drag boats/circle and drag hydros), center console offshore fishing boats, and offshore cats. With the exception of F1 race tunnels and hydros, the others generally have multi engine and drive setups that cancel propeller torque through counter rotation, making them less sensitive to helm placement.
The Heat will still torque roll to the left even with the helm on the right. I try to eliminate it by running approximately 1/4 tank more gas in the starboard tank. You can tab it out, but that usually slows the boat somewhat.
Regards,
Steve
Last edited by Steve Zuckerman; 02-24-2010 at 04:55 PM.
#4
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Join Date: May 2009
Location: Texoma
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DAMN IT!! I just bought a LH 27 P5-X for my boat. I asked 3 people if it would matter and they all said it wouldn't. That's great!! LOL He told me I could trade it if I didn't like it. I really wanted a B1 28.
Derek
Derek
#5
Registered
You can try it before you let it go, but I think you'll find it to be a pain in the azz. The 5 blades are great props, but because they lock up better than four blades, they generate even more rotational torque. I think you'll be running way low to starboard. You will have to run a lot of weight to port (or starboard/right down tab) to offset the propeller torque.
I have a friend who was running a 30" B1 on a Baja 272 with a built motor. We had planned to let him try my TU blueprinted 30" B1, when I noticed he had been running a left hand 30". I asked him if it was running low to starboard and he said "yeah, but I've learned to drive through it"............
I said "I think you'll like this one a lot better". He picked up 5 MPH and his boat handles a lot better.
Regards,
Steve
Last edited by Steve Zuckerman; 02-28-2010 at 08:48 PM.
#7
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Let us know how it goes.
Regards,
Steve
#8
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Derek
#9
Chris
Gold Member
I have never tried a P5....
I have tried a P4, and it was pretty fast... I just could not get it to hook up on the bottom end.
Labbed bravo's worked better overall.
The P5 should be an interesting test... though the left hand thing most probably wont work so well.
I have tried three different left had props.. a bravo, a P5x, and a Hering.
When trying left handed props, I borrowed matching sets of counter-rotating props intended for twin engined boats.
They all made the boat handle much more poorly than their right handed counterparts.
Chris
I have tried a P4, and it was pretty fast... I just could not get it to hook up on the bottom end.
Labbed bravo's worked better overall.
The P5 should be an interesting test... though the left hand thing most probably wont work so well.
I have tried three different left had props.. a bravo, a P5x, and a Hering.
When trying left handed props, I borrowed matching sets of counter-rotating props intended for twin engined boats.
They all made the boat handle much more poorly than their right handed counterparts.
Chris
Last edited by CB-BLR; 03-01-2010 at 10:31 PM.
#10
Registered
Derek,
I believe the P5 is a stern lifter designed primarily for light race boats. A lot of the Vee Light boats (27' to 30' canopied vees, like Phantoms with 525s) run them.
These boats, having no cabin amenities, are light enough in the nose to get away with this prop. We need bow lift.
Oh well, you have it. May as well try it. I don't think it's going to make you or your boat happy though.
Regards,
Steve
I believe the P5 is a stern lifter designed primarily for light race boats. A lot of the Vee Light boats (27' to 30' canopied vees, like Phantoms with 525s) run them.
These boats, having no cabin amenities, are light enough in the nose to get away with this prop. We need bow lift.
Oh well, you have it. May as well try it. I don't think it's going to make you or your boat happy though.
Regards,
Steve