Search found 147 matches

by WaterWalker
Thu Dec 22, 2011 8:52 pm
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Re: Measure your Airboat's HP using thrust and Blast Speed

OK Duane, Indeed you are a sport. :lol: I like the Kirby Vacume promotion. See the following picture of an airplane downwashing into a cloud deck that shows the amount of air that this plane is kicking downward to maintain flight. downwash of jet plane 12=22=11.gif Now that I have you perhaps conven...
by WaterWalker
Thu Dec 22, 2011 2:41 pm
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Re: Measure your Airboat's HP using thrust and Blast Speed

This response is for Duane, whose comments, I think, have helped others who have been interested in this thread: There are those who wish to believe and those that wish to know. “Yes Virginia, there is no Santa Claus” If you Google that quote from Miracle on 32nd. Street, you will see more articles ...
by WaterWalker
Wed Dec 21, 2011 2:08 pm
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Re: Measure your Airboat's HP using thrust and Blast Speed

Oops!, In my hurry, I got atmospheric pressure wrong, its 14.7 PSI and I sighned off twice. Sorry about that.
by WaterWalker
Wed Dec 21, 2011 1:48 pm
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Re: Measure your Airboat's HP using thrust and Blast Speed

let's keep it clean, folk; :shock: An airboat propeller pushes air rearward. No one would think of an outboard boat motor's propeller doing anything but pushing water rearward. So it is with airboat propellers. Where does that air come from? The air moves into the propeller disc area from a large he...
by WaterWalker
Tue Dec 20, 2011 12:04 am
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Re: Measure your Airboat's HP using thrust and Blast Speed

December 19, 2011 SA response, measure of thrust & velocity for HP, to several comments. Duane: Yes, I scratched my head with it for awhile in the beginning of trying to understand the formula that I suggest would be proven with testing. This next explanation is for Chuckett & Water Thunder ...
by WaterWalker
Sun Dec 18, 2011 6:15 pm
Forum: Airboat Tech
Topic: Measure your Airboat's HP using thrust and Blast Speed
Replies: 36
Views: 7709

Measure your Airboat's HP using thrust and Blast Speed

Measure your Airboat HP using Thrust and Blast Speed With a simple thrust test & a small “wind mill” (an anemometer) you can measure and calculate your airboat’s actual delivered horse power. You can see if what you have been told about your engine is true! Follow me through with something here ...
by WaterWalker
Sun Dec 18, 2011 1:29 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

glades cat: I read your question and don't grasp your meaning. The internal mechanisims of movable blade hubs typically are hydrolic and in a few cases are electric. In either case one has to transfer presurized oil, or electric current through to the "rotating par, the propeller systemt"....
by WaterWalker
Sun Dec 18, 2011 12:31 pm
Forum: Airboat Talk
Topic: Airboating In The Winter
Replies: 12
Views: 1677

Re: Airboating In The Winter

Skip: Looked at the article, great. Brings back the ol memories. As a kid, I spent a couple of years up there Land Surveying and road building a highway along the Copper river from Big Delta down to Chitna. Spent a winter in Valdez just before the "big Quake". About a decade ago I was in F...
by WaterWalker
Sat Dec 17, 2011 11:44 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

flying fish: The way the propeller system works is a two way electric actuator ram (see eariler pictures) drives a single action hydrolic ram that forces oil through metal tubing to a fitting at the rear of the main propeller axle shaft. The pressurized oil (say power stearing fluid) passes through ...
by WaterWalker
Thu Dec 15, 2011 5:57 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

David, How much can the prop adjust? I guess the question I am getting at is would the performance of a boat benefit from full feathering capabilities or only within the props mark range? Andrew: The "Operating range" is generally what one could reach for in a ground adjustable prop that ...
by WaterWalker
Mon Dec 12, 2011 9:55 am
Forum: Airboat Tech
Topic: Water Walker Motor Mounts Are any of you running them ?
Replies: 3
Views: 504

Re: Water Walker Motor Mounts Are any of you running them ?

Go to website;

http://waterwalkerllc.com/Motor%20Mounts.htm

For a full description, pictures, etc. about the motor mounts

David Wine
by WaterWalker
Thu Dec 08, 2011 9:50 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

flying fish: The last picture further back in this post shows an 12 volt electric actuator that drives a hydraulic piston in a single barrel cylinder. The actuator is bi-directional and moves at a rate that will give meaningful pitch changes in the order of a second or so in the fairly small operati...
by WaterWalker
Thu Dec 08, 2011 2:49 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

Jeff: That is the target range of cost which will be determined if all the testing is successful. Tony: The Concept boat is a "One Off" build by us for testing new ideas at Water Walker. But here is the news. "It is likely that after the tests for the operator adjustiable variable pit...
by WaterWalker
Tue Dec 06, 2011 3:02 pm
Forum: Airboat Talk
Topic: old school airboat rebuild completed with pics :)
Replies: 33
Views: 5432

Re: old school airboat rebuild completed with pics :)

Aeon:
I repeat all of the Kudos above and add that your prop on the rebuild sure looks better than the old one. I trust it will serve you well for a very long time.
regards,
David Wine
by WaterWalker
Tue Dec 06, 2011 2:36 pm
Forum: Airboat Talk
Topic: Alligator Hunters needed by Florida
Replies: 0
Views: 539

Alligator Hunters needed by Florida

TALLAHASSEE, Fla. - State wildlife officials are looking to hire alligator trappers in Martin and Palm Beach counties to help remove alligators in developed areas. The Florida Fish and Wildlife Conservation Commission's Statewide Nuisance Alligator Program is accepting applications for contracted tr...
by WaterWalker
Sat Dec 03, 2011 12:16 pm
Forum: Automotive Power Only
Topic: Best prop for big boat?
Replies: 26
Views: 3946

Re: Best prop for big boat?

author: With "tongue in cheek" if you want to compare your four blade Falcon set to a group of "big boats", a set of four these boats (see picture below) were built by a premier airboat builder in Louisiana last year. He orderded sixteen sets of four blade Falcons and these are t...
by WaterWalker
Tue Nov 29, 2011 5:56 pm
Forum: Airboat Tech
Topic: Sensenich R blade wins the thrust challenge again.
Replies: 56
Views: 4856

Re: Sensenich R blade wins the thrust challenge again.

Glades Cat: I read your quote that plum just refered to. You are on target. When I first designed a prop for airboats so many years ago, I designed for an optimized forward speed of about twenty miles per hour so the specific propeller would be coming into it's best speed efficiency range as an airb...
by WaterWalker
Sat Nov 26, 2011 5:14 pm
Forum: Airboat Tech
Topic: the majical powers of AVGAS
Replies: 20
Views: 1441

Re: the majical powers of AVGAS

Centry: The R-4360 was a 28-cylinder four-row air-cooled radial engine. Each row of pistons was slightly offset from the previous, forming a semi-helical arrangement to facilitate efficient airflow cooling of the successive rows of cylinders, with the spiraled cylinder setup inspiring the engine's &...
by WaterWalker
Sat Nov 19, 2011 9:24 pm
Forum: Airboat Talk
Topic: Oldest trees in Collier County
Replies: 9
Views: 879

Re: Oldest trees in Collier County

November 19, 2011 Collier County, Oldest Trees; Ah, the Fakahatchee Strand of the Everglades. The pictures of 500 year old cypress trees and swamps in Collier County bring back the memories. As a young man and freshly licensed Florida Land Surveyor, I took on a contract to survey out a complete Town...
by WaterWalker
Sat Nov 19, 2011 12:11 pm
Forum: Airboat Tech
Topic: Definitions of Pitch of Airboat Propellers & a Short Story
Replies: 10
Views: 3148

Re: Definitions of Pitch of Airboat Propellers & a Short Sto

Shane: Thanks for the comment, I certainly and humbly stand corrected. I said in my post that "I'm generally aware" of the Arneson Drive but was obviously not aware enough to be correct. I don't feel so bad though when the Customs & Border Protection were suprised with the performance....
by WaterWalker
Sat Nov 19, 2011 10:34 am
Forum: Airboat Tech
Topic: Definitions of Pitch of Airboat Propellers & a Short Story
Replies: 10
Views: 3148

Re: Definitions of Pitch of Airboat Propellers & a Short Sto

Antiquefarmequipment: Thanks for your comments & ideas. First, your handle suggests that you would have "an interesting back yard". I am generally aware of the "Arneson Surface Drives" for very high speed boats. Their process of cutting into the surface of the water behind th...
by WaterWalker
Thu Nov 17, 2011 9:11 pm
Forum: Airboat Tech
Topic: Definitions of Pitch of Airboat Propellers & a Short Story
Replies: 10
Views: 3148

Definitions of Pitch of Airboat Propellers & a Short Story

November 17, 2011 Water Walker Definitions of Pitch for Airboat Propellers plus a Short Story. First, the short story; A year or so after I introduced the hollow composite carbon based propellers for airboats, the Sensenich Company, with my encouragement started to make and sell their versions of th...
by WaterWalker
Tue Nov 15, 2011 11:58 am
Forum: Airboat Tech
Topic: prop pitch
Replies: 6
Views: 825

Re: prop pitch

Fakeleg: I still don't know the reduction ratio of your stinger gear box. You are still wanting to know effectively "can you break the props". I don't think so but to date no one that I know of has tried to run 700 HP on a three blade Maximus. At 15 degrees tip pitch (which is where I assu...
by WaterWalker
Tue Nov 15, 2011 11:27 am
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8707

Re: Reduction Ratios & Propeller pitch Choices

reply: November 15, 2011 SA response Good morning folk: Interesting comments over last evening; First is a question by plum to thunder. “Is there a point where more HP is not needed?” For Ride boats of up to four passengers, I think that about 400 HP if properly rigged with proper reduction and a go...
by WaterWalker
Mon Nov 14, 2011 9:47 pm
Forum: Airboat Tech
Topic: Reduction Ratios & Propeller pitch Choices
Replies: 41
Views: 8707

Re: Reduction Ratios & Propeller pitch Choices

Bad Co. James: The pendullum swings and now popular opinion has swung way out there to the larger ratios. When I first designed the super wide blade Maximus blades, it was intended to be run on medium to larger car motor boats with reduction ratios of about 2.3/1 to turn the props up to 2100 RPM to ...

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