Search found 147 matches

by WaterWalker
Mon Nov 14, 2011 7:49 pm
Forum: Airboat Tech
Topic: prop pitch
Replies: 6
Views: 825

Re: prop pitch

Fakeleg: Are you pulling my good leg? The short answer with "tongue in check" is 90 degrees maximum pitch. Beyond that you would be blowing air forward. It would be good on a hot day but you would be "backing up" Seriously; There is alot of missing information in your querry; Wha...
by WaterWalker
Mon Nov 14, 2011 11:53 am
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8722

Re: Reduction Ratios & Propeller pitch Choices

Reply: Southern Airboat 11-14-11 Good Morning Folk: Reading the comments this morning, I find a request for a graph to explain all this. Great!! I just went to the website of the Crate Engine Depot Company. (I also see the money spent chart posted & its true.) See http://www.crateenginedepot.com...
by WaterWalker
Sun Nov 13, 2011 12:43 pm
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8722

Re: Reduction Ratios & Propeller pitch Choices

Wild Bill: "So a boat with the rudders midpoint of length centered with the height of of the propeller center-line will have less torque roll! interesting thread! Thanks!" Sorry, but Not True. Excessive boat torque roll that might me caused by a "high pitch propeller setting" cau...
by WaterWalker
Sun Nov 13, 2011 10:42 am
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8722

Re: Reduction Ratios & Propeller pitch Choices

November 13, 2011 Dantheairboatman: Dan: I have read and re-read your last post to glean your meanings. I am intrigued with the testing equipment that you mention and would like to know more about it. I consider the final best description of the efficiency of any airboat setup is to be able to state...
by WaterWalker
Sat Nov 12, 2011 11:50 am
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8722

Re: Reduction Ratios & Propeller pitch Choices

Reply; Thanks for the comments and to those that viewed the thread so far. The action word in the Thread Title is “Choices”. It is not my intent to “pitch” (a play on words) for any particular setup, but rather to have us see, if interested, and understand what is going on with all that air that is ...
by WaterWalker
Fri Nov 11, 2011 1:54 pm
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8722

Reduction Ratios & Propeller pitch Choices

This Text is copied from a communication that I recently had with Chuck Rackley of Airboat Pros. We were discussing the most fuel efficient and quietest combinations of reduction ratios and propeller pitch settings (degrees of pitch at the tips of say a Maximus propeller set). To help describe the i...
by WaterWalker
Fri Nov 11, 2011 9:04 am
Forum: Aircraft Power Only
Topic: how to set pitch on a powershift prop
Replies: 7
Views: 2827

Re: how to set pitch on a powershift prop

Melonator: AirRanger comments; (cliff notes version) A good starting point is to get yourself a torpedo level and an angle finder. Use the level on prop hub to confirm prop is level horizontal. Use angle finder at one blade tip, adjust blade to (for example only) 10 degrees. Snug blade. By hand turn...
by WaterWalker
Wed Nov 09, 2011 9:53 am
Forum: Automotive Power Only
Topic: GM 4 cylinder Ecotec Engine
Replies: 142
Views: 24710

Re: GM 4 cylinder Ecotec Engine

gyrocopter582 & Chuckett: I have been following this thread and am impressed (as are many others) with the following, ideas & and activity about the Ecotec Engine. This "Fuel efficiency Thing" is taking hold. The price of gasoline can only go up, way up with future inflation. I am ...
by WaterWalker
Wed Nov 02, 2011 10:56 am
Forum: Automotive Power Only
Topic: Water Walker's Variable Pitch Propeller Project
Replies: 36
Views: 6201

Re: Water Walker's Variable Pitch Propeller Project

Ruagatr: flying fish: David GSO 480: Answers; I hope to achieve what "Ruagatr" was talking about with his small engine years ago for modern car motor boats first and aviation motors as the project might continue. A top preforming airboat in its first few mph of lower speed range needs to v...
by WaterWalker
Tue Nov 01, 2011 4:12 pm
Forum: Automotive Power Only
Topic: Water Walker's Variable Pitch Propeller Project
Replies: 36
Views: 6201

Re: Water Walker's Variable Pitch Propeller Project

I thought It would help to add pictures again to help bring this thread back to the Varible Pitch Propeller Question. I would like to see comments bad and good, if any, about the variable pitch new propeller set up to help me decide if we want to produce this preformance improving product for airboa...
by WaterWalker
Fri Oct 28, 2011 11:10 pm
Forum: Automotive Power Only
Topic: Water Walker's Variable Pitch Propeller Project
Replies: 36
Views: 6201

Re: Water Walker's Variable Pitch Propeller Project

10-28-11 Flyingfish: A great amount of thought was given to your question of the need for a lower additional bearing to augment the rear main bearing of the small block GM motor that this unit was designed for. To be able to design a unit to hold the HP and still be lightweight, long lasting and eco...
by WaterWalker
Fri Oct 28, 2011 11:06 am
Forum: Automotive Power Only
Topic: Water Walker's Variable Pitch Propeller Project
Replies: 36
Views: 6201

Water Walker's Variable Pitch Propeller Project

This post is a result of and continuation of Andrew's "Variable/Constant Speed" eariler post in Tech Talk. Because the subject of our existing project of a "new for airboats, Operator Adjustable Variable Pitch Propeller project", that was tabled a few years back because of the ec...
by WaterWalker
Thu Oct 27, 2011 1:17 pm
Forum: Airboat Tech
Topic: variable/constant speed props
Replies: 21
Views: 2609

Re: variable/constant speed props

Thanks for the clarification David. So with this design, the "drive shaft" or "axle" must be hollow to deliver the pressurized oil, correct? Will your design be interchangeable with current Belt and gear reductions or only with the Blue Lightning? Andrew: So far our variable pit...
by WaterWalker
Thu Oct 27, 2011 1:06 am
Forum: Airboat Tech
Topic: variable/constant speed props
Replies: 21
Views: 2609

Re: variable/constant speed props

David, Thanks again for the post. I really enjoyed reading it and appreciate your detailed reply. I have only owned one Water Walker prop but can honestly say I love it. It made my GPU far out perform what it did with a number of different wood props. I hope you get this system into production soon...
by WaterWalker
Wed Oct 26, 2011 2:07 pm
Forum: Airboat Tech
Topic: variable/constant speed props
Replies: 21
Views: 2609

Re: variable/constant speed props

OK, I think I have figured out how to add pictures. Please view these with my earlier post,
Thanks,
David Wine
Shane varible 10-2-11 001.JPG
Shane varible 10-2-11 001.JPG (142.43 KiB) Viewed 2334 times
Shane varible 10-2-11 002.JPG
Shane varible 10-2-11 002.JPG (142.14 KiB) Viewed 2334 times
Shane varible 10-2-11 003.JPG
Shane varible 10-2-11 003.JPG (130.5 KiB) Viewed 2334 times
Shane varible 10-2-11 003.JPG
Shane varible 10-2-11 003.JPG (130.5 KiB) Viewed 2334 times
by WaterWalker
Wed Oct 26, 2011 1:21 pm
Forum: Airboat Tech
Topic: variable/constant speed props
Replies: 21
Views: 2609

Re: variable/constant speed props

10-26-11 from David Wine Water Walker, LLC Andrew: I was drawn to your post this morning and respond with this up-date report on our “Operator adjustable airboat propeller” project at Water Walker, LLC. I am writing a detailed summary so as to let everyone know our current status. History and backgr...
by WaterWalker
Mon Oct 24, 2011 6:28 pm
Forum: Airboat Talk
Topic: Airboats on TV tonight 10:00 PM ET
Replies: 6
Views: 1321

Airboats on TV tonight 10:00 PM ET

I just learned that a program on the History Channel (H-2) will air tonight at 10:00 Pm Eastern Time. The subject is the assembly and supprising history of airboats. Mark's Airboats from Lousiania will be featured I plan to watch it..
Water Walker,
David Wine
by WaterWalker
Sun Oct 09, 2011 9:49 am
Forum: Automotive Power Only
Topic: bite the bullet
Replies: 55
Views: 8339

Re: bite the bullet

ZoomZoom: Thanks for the kind remarks. In the past years we have done many thrust tests and always faired very well against competion. Controlled test as to fuel burn etc, however the answer is no. On airfoils; Our propellers use airfoils that I developed myself supprisingly using a PC computer prog...
by WaterWalker
Sat Oct 08, 2011 8:58 am
Forum: Automotive Power Only
Topic: bite the bullet
Replies: 55
Views: 8339

Re: bite the bullet

Oct. 8, 2011 ZoomZoom: Thank you for your continued interest, your insightful comments and good questions. Indeed this thread has morphed from engines and boxes to propeller dynamics for airboats. It’s probably not fair to Jeff to lead it away from his first questions. Having said so, none the less,...
by WaterWalker
Tue Oct 04, 2011 4:10 pm
Forum: Automotive Power Only
Topic: bite the bullet
Replies: 55
Views: 8339

Re: bite the bullet

Chris: Several answers to your several questions. The 10.61 square feet of disc area "statistical constant" is not a formula, but rather is a statistical average of thousands of well preforming air thrust propeller applications. Wings on airplanes and propeller blades produce "work&qu...
by WaterWalker
Fri Sep 30, 2011 6:59 pm
Forum: Automotive Power Only
Topic: bite the bullet
Replies: 55
Views: 8339

Re: bite the bullet, blade count questions

September 30, 2011 Answer to Jeff Kreger’s questions; 1 - What impact does the number of blades have on the propeller disc area? If any? Medium HP driven air propellers for airboats & airplanes are constrained in their designed disc area by; • The relationship of the disc area’s circumference to...
by WaterWalker
Thu Sep 29, 2011 7:54 pm
Forum: Automotive Power Only
Topic: bite the bullet
Replies: 55
Views: 8339

Re: bite the bullet

Response from Water Walker; David Wine. Thanks “Chuckett” for telling me about this thread on the Forum. “Zoom Zoom” you are perceptive to ask “Where did you get the 10.61 HP per sq. ft. disc loading as a constant? Chuck got it from me at Water Walker. The history of this “rule-of-thumb” constant wa...

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