Airboat power measuement

A general, non-powerplant specific, discussion on airboat technology, ie., hulls, rigging, polymer, etc..
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Airboat power measuement

Postby bayouboy56 » Fri Sep 23, 2016 3:03 pm

I'm trying to rig something up to measure the push I am getting from my prop. so I can achieve the best pitch for the most power out of my boat. Can you give me a good way to set this up? I don't know if it should be on the ground on the trailer or in the water and what device to use to get the results.
Thanks anything will be helpful.

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Re: Airboat power measuement

Postby scottyroll » Fri Sep 23, 2016 3:42 pm

What power combination are you running

A/C or CM?

14ft Laser/6.0 LQ4/2.37 Rotator/3 Blade "K"

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Re: Airboat power measuement

Postby kwanjangnihm » Fri Sep 23, 2016 4:21 pm

" I don't care who you are back in the world, you give away our position one more time, I'll bleed ya, real quiet. Leave ya here. Got that? "

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Re: Airboat power measuement

Postby ZoomZoom » Fri Sep 23, 2016 5:27 pm

I use a hyd. scale that goes to 1K lbs. You can do it on the water or on the trailer, one thing you must subtract the lbs. it takes to move the boat with out the eng. running from the total amount you show on your scale or gauge. This is the way that I do it, and I use a hyd. scale. Zoom.

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Re: Airboat power measuement

Postby glades cat » Fri Sep 23, 2016 6:59 pm

If you do your test with the boat in the water and the load cell/tension meter on tierra firma, you will have factored out hull/ground friction. Beware that static thrust is just that. Blade efficiency with no forward movement through air. Once you start moving and accelerating, the thrust curve changes and so does the prop's thrust characteristics.
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Re: Airboat power measuement

Postby SWAMPHUNTER45 » Sat Sep 24, 2016 9:04 am

Poor man method

Measure out a 40 yard stretch of dry ground.

Do timed runs varying pitch.

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Re: Airboat power measuement

Postby SQD » Sat Dec 03, 2016 6:58 am

If you want to find out what your boat is pushing we have the equipment at our shop. Thrust tests start at $100.00 for the first hour and shop time after that. Most tests are done in the first hour. We have forms we fill out for the test and give our customer a copy. If you purchase a prop from us, you get a free thrust test. Every engine is different, some make power at higher rpms. some at lower rpms. The only way to find your best power range or best economic range is with a thrust test.

For appointments call Dave at Simpson Quality Designs Inc.
Ph: 772-563-0435
Vero Beach, fl.

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