2 aerate or not?????

[C35]

If the boat is set up with big props and high X to go fast you have to aerate the props. Once it is up only half of the prop is biting while its coming on plane the entire prop is biting and bogging the engine down.

Does your car like to come off a light in 3rd gear?

asking cuz i dont know. with same pitch why does it matter? is it more slip when up?

[Scarab KV]

Would this be anything to consider with the KV and TRSs?

[MOBILEMERCMAN]

asking cuz i dont know. with same pitch why does it matter? is it more slip when up?

The slip is a measure of efficiency on plane. When talking about coming on to plane slip isn't really applicable. Aerating does however allow the props to slip or more accurately stated ventilate. When the prop ventilates it allows the engine to rev up. Years ago many boats would ventilate on their own while coming on and at times had a negative effect but, now days with modern propellers and ultra high speed set ups a controlled ventilating is a must. Many thru the hub exhaust propellers have holes[ some with adjustable sizes ] to allow you to adjust the ventilation to improve a hole shot. Speed master drives are obviously different and aerating tubes are the way to get air in behind the leading edge of the prop to get it to ventilate.

For example a 525 and #6 boat like Amsoil can swing { not sure exactly } like 34 inch propellers and can go 130 some miles an hour. Say 3000 rpm's is 75 mph and 5300 is 130 { just guessing }. The bottom half of the propeller is doing all the work. The boat is running on plane and has little drag. Now to get it there with the available power, gear ratio, prop selection, entire bottom and drive dragging, entire prop biting, in a rpm range well under the power curve you need to slip the props to allow the engine to gain rpm's and get into its significant power range.

[Wrinkleface]

Teague said the rubber tubes helps cut down on vibration/harmonics compared 2 a solid tube! hey, if it's good enough 4 Bob!!

[Wrinkleface]

Interesting search...


Formula with Ilmors and aerators......





Attachment 72869


Attachment 72870


Attachment 72871

That bad boy sits on a hoist in Bay Harbor!! heard another 38 Fastech w/ Ilmors may B show'n up on Lake Char!!

[Bobcat]

Teague said the rubber tubes helps cut down on vibration/harmonics compared 2 a solid tube! hey, if it's good enough 4 Bob!!

I just got off of my pretend phone with Bob.....He doesn't even know who you are......name droppin fool!

[Wrinkleface]

I just got off of my pretend phone with Bob.....He doesn't even know who you are......name droppin fool!

Punk!

[Wrinkleface]

Go'n down 2 Ilmor tomorrow 2 C my engines!!!

[Bobcat]

They are outback.....covered in snow and the cries of a million patients !!

[Perlmudder]

There were pics on the other site of a small cat, maybe a 26 nordic, or dcb that had a single number 6 running big power, and it had a sick carbon cover on the back of the drive that covered the aerator tube.

[Ratickle]

There were pics on the other site of a small cat, maybe a 26 nordic, or dcb that had a single number 6 running big power, and it had a sick carbon cover on the back of the drive that covered the aerator tube.

If you take a look in post 16, that is the sister to Wrink's new boat. It will be hard to see the aerator tubes at all. From what Bob Teague was saying, surface drives have so much vibration that things loosen fall apart and crack pretty badly anyway. The tube sets up harmonics on top of that which make it worse. That's why nothing but rubber hose has worked so far in the long term.

[Wrinkleface]

engines were go'n on the dyno today! have not heard how things have turned out yet!!!

[sy goldberg]

HEY WRINK ! How do you aerate oars ?

[rschap1]

I am wondering why the harmonics and vibrations...
Props surely must be balanced.
Drive shafts need better concentricity and balance?
Should CV style joints be incorporated rather than universals?
Or is it just 1/2 the prop bing in the water and 1/2 above?
entering and exitting the water creating a "shock" at each event?
Just wondering if much investigation into this has taken place already?

In advance THANKS

[Wrinkleface]

HEY WRINK ! How do you aerate oars ?

by shove'n up your wrinkly old butt!!!!!!

[Ratickle]

by shove'n up your wrinkly old butt!!!!!!

[Bobcat]

Sounds like a date to me....

[Ratickle]

This is one time I DO NOT want pictures though.....

[old377guy]

who's aerating who?

[Wrinkleface]

was gunna post up my starboard engine installed but cuz I'm puter stupid, I can't!!!! Rat said he would help but he never answers his phone!!!