Prop vent tubes help!
#12
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Well, bought a cheap ass radiator hose with a 90 bend at the end and stabbed it on with some zip ties and hose clamps...it let the motor spool and it planed with a prop that it wouldn't plane with before. The tube was about 1.75" ID. In short it works. My next step is to buy couple smaller diameter hoses and experiment as it needed more bite. After that I will fab a stainless one.
I'll have to try that before I have some made, that's a pretty good idea! Did you make it up kind of like the 3rd pic you posted?
I think I'm getting real close to the right prop, I'm just waiting on a call back from Bblades to maybe try a 30p, but just not sure if I can get up with it. If the simple setup you did with the hose helped that much I should be golden! Did you only run one 1.75" hose, and was it just set off to one side in front of the prop?
#13
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I'll get pics, I run a left hand prop because my boat runs flat at lower speeds with it. The top of the tube I zip tied to the right (stbd) side of the drive shower hose by the top cap and steering ram mounts. I ran a hose clamp around the back of the trim cylinder and another through it and around the bottom of the hose. The 90 hooks around the cav plate and ends 1" away from the prop.
My new plan after looking at it last night is to run the tube directly thru the stainless imco cav extension plate, with a bung on top for a hose.
My new plan after looking at it last night is to run the tube directly thru the stainless imco cav extension plate, with a bung on top for a hose.
Last edited by JRider; 08-12-2014 at 09:04 AM. Reason: Added info
#16
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I'll have to try that before I have some made, that's a pretty good idea! Did you make it up kind of like the 3rd pic you posted?
I think I'm getting real close to the right prop, I'm just waiting on a call back from Bblades to maybe try a 30p, but just not sure if I can get up with it. If the simple setup you did with the hose helped that much I should be golden! Did you only run one 1.75" hose, and was it just set off to one side in front of the prop?
I think I'm getting real close to the right prop, I'm just waiting on a call back from Bblades to maybe try a 30p, but just not sure if I can get up with it. If the simple setup you did with the hose helped that much I should be golden! Did you only run one 1.75" hose, and was it just set off to one side in front of the prop?
#18
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The tubes allow air to break the high pressure water off the blade faces creating a initial high rpm to get the boat moving. The high rpm will create a slight launch as the blades re-load. Once the boat is up the vent tube are non-effective because there is no longer a direct line of air to water to prop. There is now a air gap between bottom of cav plate and the water itself.
Brett
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
#19
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Well I got to try a 1.75" radiator hose, WOW what a difference! It still loads up for about 10 sec or so but after that it's like a rocket!
It seems to maybe slip a little much with 1.75" hose, but I'm going to try it with a 30p first before I down size. Just having to wait on a 30p to become available from Bblades (cough cough Brett) before I can do more testing.
It seems to maybe slip a little much with 1.75" hose, but I'm going to try it with a 30p first before I down size. Just having to wait on a 30p to become available from Bblades (cough cough Brett) before I can do more testing.