Search found 929 matches

by jim
Fri Feb 13, 2009 8:19 pm
Forum: Hunting & Fishing
Topic: Hog hunting African style
Replies: 1
Views: 840

Hog hunting African style

I thought you might enjoy this one.

Image

jim
by jim
Tue May 20, 2008 9:27 am
Forum: Aircraft Power Only
Topic: Aircraft fuel injection for fun!
Replies: 20
Views: 2426

Re: Aircraft fuel injection for fun!

Dave, I thought you might be interested in reading this: http://www.enginehistory.org/Convention/2005/Presentations/LawPete/ADI.pdf I actually built a hot rod VW engine using water injection with a kit made by Spearco. It used a windshield washer pump with voltage regulated by a sensor in the intake...
by jim
Thu Feb 14, 2008 6:40 pm
Forum: Aircraft Power Only
Topic: 480 supercharged?... would you buy one????
Replies: 46
Views: 3931

Scotty, The DC-6B2T had P&W R-2800's that were water/alcohol injected and they pulled 59.5 inches of manifold pressure on take off. That is very close to 15 pounds of boost. The heads got hot fast on take off. That power occurred at less than full throttle at sea level, but that was rated power....
by jim
Thu Feb 14, 2008 4:40 pm
Forum: Aircraft Power Only
Topic: 480 supercharged?... would you buy one????
Replies: 46
Views: 3931

Scotty, Your comments are true about some of the early turbos. Specially the add on models where the engines were not originally certified with turbos. Any thing goes on a boat of course and heat is a problem. Most of the big piston engines are blown and they pull very high manifold pressure on take...
by jim
Wed Feb 13, 2008 11:56 pm
Forum: Aircraft Power Only
Topic: 480 supercharged?... would you buy one????
Replies: 46
Views: 3931

A supercharged 480 makes about 45 hp more than the most powerful non-supercharged 480 at sea level.

http://www.prime-mover.org/Engines/Lycoming/Lyc_Cert_list.html

jim
by jim
Mon Feb 11, 2008 10:22 am
Forum: Aircraft Power Only
Topic: Anybody going to buy that 9 cyl. radial in the classied?
Replies: 18
Views: 1448

The dry weight is 560, so with an oil tank and cooler and oil plus exhaust it would probably be at least 650.

jim
by jim
Mon Feb 11, 2008 7:28 am
Forum: Aircraft Power Only
Topic: Anybody going to buy that 9 cyl. radial in the classied?
Replies: 18
Views: 1448

The Ag-Cat had a Pratt & Whitney R-985 which is 450 hp. If I were going to build a radial engined airboat, I would use this engine. It has everything going for it including being geared and the same rotation as a geared auto engine, making big props available. It will also take the throttle jock...
by jim
Sun Feb 10, 2008 11:03 pm
Forum: Aircraft Power Only
Topic: Anybody going to buy that 9 cyl. radial in the classied?
Replies: 18
Views: 1448

If it really a 9 cylinder Continental it is probably the 975 cubic engine built under license from Wright. That one is 420 hp on 80 octane and would take a very large boat. http://web.inter.nl.net/users/spoelstra/g104/1cacr/m7_06.html The 7 cylinder R-670, 220 hp is much more common. jim
by jim
Sun Feb 10, 2008 6:36 am
Forum: Airboat Talk
Topic: Prop shroud
Replies: 38
Views: 3124

Wanna-B The catch is that the prop needs to be pretty close to the shroud. Since an airboat is subjected to a fairly rough ride when running dry this is a design challenge. The hover craft guys have done it with good success. The FWC report on airboat noise pretty much said the only answer to the no...
by jim
Sat Feb 09, 2008 10:26 pm
Forum: Airboat Talk
Topic: Prop shroud
Replies: 38
Views: 3124

Not quite. His comment was in the year 2006.

jim
by jim
Sat Feb 09, 2008 9:24 pm
Forum: Airboat Talk
Topic: Prop shroud
Replies: 38
Views: 3124

Shrouded prop info, follow the links to go as deep as you like:


http://4wings.com.phtemp.com/tip/tpdduct.html


jim

PS, this is not a political thread.
by jim
Sat Feb 09, 2008 1:48 pm
Forum: Aircraft Power Only
Topic: how to do a leak check
Replies: 16
Views: 1666

by jim
Fri Feb 08, 2008 8:44 pm
Forum: Aircraft Power Only
Topic: Really Big Aircraft Engines
Replies: 30
Views: 3102

The later Budweiser boats used the RR Griffon which was a very potent engine:

http://en.wikipedia.org/wiki/Rolls-Royce_Griffon

jim
by jim
Fri Feb 08, 2008 2:54 pm
Forum: Aircraft Power Only
Topic: Really Big Aircraft Engines
Replies: 30
Views: 3102

The R-2800 P&W was the best one in my opinion. We had very little trouble with them The 4360 was troublesome(I have heard) as was the Wright 3350 turbo compound. The 3350 and the 4360 had a lot of power, but it was a moot point after the jets came out. The DC-6 with the 2800 soldiered on as a sh...
by jim
Thu Feb 07, 2008 9:19 pm
Forum: Aircraft Power Only
Topic: Really Big Aircraft Engines
Replies: 30
Views: 3102

by jim
Tue Jan 15, 2008 9:52 am
Forum: Airboat Talk
Topic: Blue Lightning Belt Drives?
Replies: 100
Views: 9276

chuckitt@earthlink.net quoted EPI, Inc Whirl Mode is a divergent conical oscillation of the engine and mount about an axis more or less parallel with the powerplant static thrustline. It occurs when the application of a gyroscopic moment to the powerplant provides an excitation of a bending resonan...
by jim
Tue Jan 08, 2008 7:45 am
Forum: Airboat Talk
Topic: pic of my grandpa old boat
Replies: 10
Views: 1471

Those old flat head fords had a unique sound. Short stacks? How about no stacks?

jim
by jim
Sat Jan 05, 2008 8:47 am
Forum: Aircraft Power Only
Topic: Motor harmonics with carbon props
Replies: 62
Views: 5318

If the bolts shear at the threads it is likely harmonics. If the bolts break off at the heads it is more likely gyroscopic loads which can be caused by boat spins at high power.

jim
by jim
Fri Jan 04, 2008 1:07 pm
Forum: Aircraft Power Only
Topic: Motor harmonics with carbon props
Replies: 62
Views: 5318

An out of balance situation is different from harmonic vibration. The reason big props can cause a problem is that the added inertia of the big prop can bring the combined resonance frequency of the prop/crankshaft combination down into the normal operating range. This causes the crank to wind up an...
by jim
Mon Dec 24, 2007 9:36 pm
Forum: Airboat Talk
Topic: NORAD SANTA TRACKER
Replies: 0
Views: 514

NORAD SANTA TRACKER

by jim
Mon Dec 24, 2007 1:46 pm
Forum: Airboat Talk
Topic: Christmas Eve
Replies: 57
Views: 3546

Image
by jim
Fri Dec 07, 2007 9:09 pm
Forum: Airboat Talk
Topic: A SERIERS AIRCRAFT ENGINE WHAT IS IT!????????
Replies: 13
Views: 1339

It was called an American Cirrus made by American Cirrus Engine, Inc in Marysville, MI.

jim
by jim
Fri Dec 07, 2007 8:52 pm
Forum: Airboat Talk
Topic: A SERIERS AIRCRAFT ENGINE WHAT IS IT!????????
Replies: 13
Views: 1339

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