WhirlWind Propellers to Answer Your Engineering Questions

[WhirlWindProps]

Hi, WhirlWind Propellers here!

We wanted to reach out the the SA community and give you all a chance to ask some propeller/engineering questions.

We also have quartly news letter call Props and Hulls that we send out via email. Anyone is welcome to subscribe to receive emails on exclusive propeller deals, tech tips, and other Whirlwind News. https://whirlwindpropellers.com/airboats/email-deals-signup/

Here is a link to our Bargains Page https://whirlwindpropellers.com/airboats/bargains/; make sure to check regularly for smoking deals in our constantly revolving inventory!
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Give us a shout at 619-562-3725 or wwpc@whirlwindpropellers.com

Everyone should already know about the latest and greatest:
Whirl Wind Propeller's CarbonMax™ airboat propeller series features a proprietary carbon-fiber weave construction and the QuickChange™ Hub blade pitch indicator system that is designed to be the easiest and most accurate pitch setting system on the market.

 

[Prototype]

Thanks Patti, if this is Patti posting? I did get your offer for free roll of tp with new prop sale! Funny butt,, true in some florida areas?
Now that the TP crunch is over in Florida, How is Calli dealing with all those paper towels being flushed?
I guess I did hijack this post for no other reason to know if your booting thru shit and your shelves are full?

 

[WhirlWindProps]

Thanks Patti, if this is Patti posting? I did get your offer for free roll of tp with new prop sale! Funny butt,, true in some florida areas?
Now that the TP crunch is over in Florida, How is Calli dealing with all those paper towels being flushed?
I guess I did hijack this post for no other reason to know if your booting thru shit and your shelves are full?

Actually this is Hunter (engineering) posting. We've been busy making sales and even busier trying to keep our shelves full so we can continue to put out orders the same day they come in.

 

[Rick McC.]

Thanks; I just signed up for your newsletter.

 

[Prototype]

Thanks Patti, if this is Patti posting? I did get your offer for free roll of tp with new prop sale! Funny butt,, true in some florida areas?
Now that the TP crunch is over in Florida, How is Calli dealing with all those paper towels being flushed?
I guess I did hijack this post for no other reason to know if your booting thru shit and your shelves are full?

Actually this is Hunter (engineering) posting. We've been busy making sales and even busier trying to keep our shelves full so we can continue to put out orders the same day they come in.

Hunter,
What do you have in the 88inch range? LHR.
I recently built a new blown boat that cavitated 3 88's on 27 and went to a 4 blade 88 on 22 that is about perfect! No roll, all push!
I was a S blade or Jx user, but never hurts to ask if you have something in the works to push vs roll!

 

[WhirlWindProps]

Hi, sorry for the delayed response:
Our largest propeller diameter is 84". The roll effect comes from the propeller having a higher pitch if it doesn't have enough blade area to produce thrust at its ideal pitch. This can be solved with wide blades (check out our SUPER WIDE Carbon Max blades: https://whirlwindpropellers.com/airboats/shop/carbon-max-sw/) or with more blades (we've made hubs for 12 bladed RazorX propellers). The 'Push' vs 'Roll' ends up translating directly into propeller efficiency, so to make sure you have an efficient propeller for your application you'll want to call and tell us your horse power and rpm and if you mostly operate at low speed or high speed.

 

[terrible ted]

Please explain what the roll Is?

 

[Slidin Gator]

According to my wife, this is a roll:

She calls these biscuits:

I just eat em.

Dad Jokes Rule :thumbleft:

 

[M0RYAK]

I just eat em.

It looks like so tasty. You are lucky. Bon appetite.

 

[M0RYAK]

Do you have any information about using the Whisper tip on the diesel engine?

 

[WhirlWindProps]

Please explain what the roll Is?

Slidin Gator pretty much nailed it, but I'll give some info on where the roll comes from when it's not fresh out'a the oven.
Torque Roll is the when torque of the engine is trying to rock your boat sideways. This happens in 2 ways: 1) when you punch the throttle and the blades are accelerating and 2) when you're cruising at high rpm and you have the torque of dragging the blades through the air.
To reduce the 1st type of torque roll, you want a lightweight propeller with all the weight at the hub and very little weight out toward the tip to minimize inertia.
To reduce the 2nd type of torque roll, you want thin, sharp trailing edges and efficient airfoil/blade planform with tapered tips to minimize the drag of each blade.
For both cases you have to have a propeller with the right blade area for your engine, otherwise you'll be swinging it with too much or too little pitch and won't get an efficient air flow.

 

[WhirlWindProps]

Do you have any information about using the Whisper tip on the diesel engine?

We have a few customers who use the Whisper tip (and now the Carbon Max) on diesel engines, but the high compression in diesel engines means eventually you will probably develop structural cracks in the blades. You can do it, but get in a habit of regularly inspecting the hub and blades so if it ever does start to crack, you notice it before it gets too bad.

 

[M0RYAK]

Do you have any information about using the Whisper tip on the diesel engine?

We have a few customers who use the Whisper tip (and now the Carbon Max) on diesel engines, but the high compression in diesel engines means eventually you will probably develop structural cracks in the blades. You can do it, but get in a habit of regularly inspecting the hub and blades so if it ever does start to crack, you notice it before it gets too bad.

It's very important information. Thank you!

 

[terrible ted]

I know what torque roll is. I guess I dense on slang of just saying roll.

Please explain what the roll Is?

Slidin Gator pretty much nailed it, but I'll give some info on where the roll comes from when it's not fresh out'a the oven.
Torque Roll is the when torque of the engine is trying to rock your boat sideways. This happens in 2 ways: 1) when you punch the throttle and the blades are accelerating and 2) when you're cruising at high rpm and you have the torque of dragging the blades through the air.
To reduce the 1st type of torque roll, you want a lightweight propeller with all the weight at the hub and very little weight out toward the tip to minimize inertia.
To reduce the 2nd type of torque roll, you want thin, sharp trailing edges and efficient airfoil/blade planform with tapered tips to minimize the drag of each blade.
For both cases you have to have a propeller with the right blade area for your engine, otherwise you'll be swinging it with too much or too little pitch and won't get an efficient air flow.
[/quot

 

[terrible ted]

I know what torque roll is. I guess I dense on slang of just saying roll.

Gator pretty much nailed it, but I'll give some info on where the roll comes from when it's not fresh out'a the oven.
Torque Roll is the when torque of the engine is trying to rock your boat sideways. This happens in 2 ways: 1) when you punch the throttle and the blades are accelerating and 2) when you're cruising at high rpm and you have the torque of dragging the blades through the air.
To reduce the 1st type of torque roll, you want a lightweight propeller with all the weight at the hub and very little weight out toward the tip to minimize inertia.
To reduce the 2nd type of torque roll, you want thin, sharp trailing edges and efficient airfoil/blade planform with tapered tips to minimize the drag of each blade.
For both cases you have to have a propeller with the right blade area for your engine, otherwise you'll be swinging it with too much or too little pitch and won't get an efficient air flow.

 

[terrible ted]

Can you help me I need the Propellers bolt pattern dimensions for a standard airboat hub. My Vo 540 has a custom starter assembly and needs a new flex plate. The Original is made out of a Chevy flex plate. So I have to add the pattern , well get a Machine shop a drawing to add the pattern to the flex plate.
Thank You

 

[Prototype]

I hate to jump a post with baked goods, but see some have a perfect rig to do nothing better! Thanks, will hit up the cook asap!

My question was experience with fatty's as un-effiecient as they were? Roll is not push but blade grab so the boat rolls vs pushes.
Some may think counter rotator or something out of the oven? I guess those have never experienced what I would say as reasonable power these days? I'm asking what pushes and cuts the air vs what drags it into the boat to roll.
Lmao some will post new or old versions of rolls that are kitchen whipped that don't relate and the real question involved!
Most can't fathom rolling a boat under from power due to kitchen duties!

 

[F0zzy2]

Well all puns, buns and rolls aside I can attest to the affects of toque roll. I went from 4 sensenich 82" super wides to 5 Whirlwind 84" EX blades and it was an awesome upgrade. The 4 sensenich superwides did push and take me everywhere I could ever want to go but my boat felt like it was gonna roll over in deep water if I really got into it. I also had a higher cruise RPM with the super wides. The 5 Whirlwind EX blades just flat out took the torque roll away, It now just jumps on step and cruises about 500 to 800 RMP's lower. Really hard for me to measure push but I run dry ground, climb beaver and haul moose just as easy as I did with the super wides.

 

[F0zzy2]

and my cruise

 

[glades cat]

Well all puns, buns and rolls aside I can attest to the affects of toque roll. I went from 4 sensenich 82" super wides to 5 Whirlwind 84" EX blades and it was an awesome upgrade. The 4 sensenich superwides did push and take me everywhere I could ever want to go but my boat felt like it was gonna roll over in deep water if I really got into it. I also had a higher cruise RPM with the super wides. The 5 Whirlwind EX blades just flat out took the torque roll away, It now just jumps on step and cruises about 500 to 800 RMP's lower. Really hard for me to measure push but I run dry ground, climb beaver and haul moose just as easy as I did with the super wides.

Dang man. That is a Moose haulin machine. Awesome.