A warp drive is pretty much the worst prop for pushing on the hill. An 82 inch 3 blade wide or super wide prop will push better on the hill.

Found one locally for 2k obviously it would have to be gone through as it has over 90k miles on it but from everything know I'm assuming a purpose built motor would be any motor that makes most of its power in lower rpms I know I'm still green with the whole airboat thing I'm learning as I go I kno...

So after 15 years of riding on other people's boats it's time to build my own starting in march I will be compiling parts putting my boat together. So here's what I want. Set up 16x8 ¾ deck deep side (atleast 24") aluminum hull 4 split seats with removable single front seat top seat captain Power 6...

Need to build a wall around China. We can use the Great Wall as a starting point.

I run my motor between 5800 and 6200 at WOT with an upgraded valve train. With your WOT at this RPM, what does your cruise end up at? Also, what Computer are you running and what gas do you run on? Here we have 87, 89, and 91/92 octane available and we are tuned to run on 87/89. Also, you asked if ...

You could also put on some LS3 heads and an LS3 intake. With the proper cam, this would pick up some HSP. Just comes down to how much money you want to spend.

Here are my cam specs:



Remember that I have 55 more cubic inches. Also I run my motor between 5800 and 6200 at WOT with an upgraded valve train.

What RPM are you planning to run the motor when at WOT? Are you OK with a choppy idle? What gear ratio and prop are you using? I don't necessarily have a WOT target for the build, but rather a target for cruise RPM around 3200-3400 RPM. I am OK with a choppy idle. Right now I am running a 2.68 Stin...

This is the year 2019. There is nothing wrong and minimal impact on longevity when running a properly built LS from 5500 to 6500 at WOT. The factory LS2 in the Corvette redlines at 6600 to 6800. Make sure you have a good top end and a proper tune. Running an LS at 5100 WOT with a 2.3 is actually har...

What RPM are you planning to run the motor when at WOT? Are you OK with a choppy idle? What gear ratio and prop are you using?

Ya this LS stuff is a bit challenging with so many tunes and cam grinds available. Im just trying to figure out how many blades I can spin with x given torque/hp Based on my experience, roughly 550 HSP will spin a 4 blade 83.5" R. This doesn't mean build an engine that makes 550 HSP at 6200 RPMs an...

Power loss or thrust loss? Are you comparing a 3 blade to a 4 blade using a 2.68 or are you comparing different ratios to a 2.68? Trying to understand what you are asking.

How many RPMs do you plan to run at WOT? This answer will help determine the gear ratio. Also a 4 blade is a better pusher prop than a 3 blade if you have the HSP to turn it.

That 540 must be making some HSP to turn a prop that big.

Been busy lately with work. Getting back to this thread. So I don't plan to spin 8000 RPMs. The max will be 7000 RPMs. Hopefully I will get a little more longevity out of this motor. :shock: The interesting thing is the LS7 comes from the factory with a 7000 RPM rev limit. The LS2 from the factory h...

The cam is one part of getting the direct drive to respond and run like it does. Why would Water thunder give away his cam spec's? My engine idle at 650 rpm's. The cam lope goes away at 900 rpm... Propellers tip speed is your limit here, the longer the prop, the faster the tip speed at the same eng...

Does anybody know the specs on the cam? I think everybody knows the answer to that.

So why do you think it was a radical cam? What RPM did it idle at?

It is what it is...it aint a full racer, but it is a fun boat to ride, performs amazing well, snaps hard. Remember its about 20% displacement disadvantage to a 0 540 Those thrust numbers were on tester, not a boat.....No cage etc in the way. The 3 blade Alpha is the only prop we tested that work in...

Here is the latest on the LOW TORQUE LS Build. Got the main bearings installed: https://southernairboat.com/wp/wp-content/uploads/rtMedia/users/171/2019/06/0518192206-800x450.jpg Torqued the inner studs to 60 ft lbs and the outer studs to 50 ft lbs. The side bolts were torqued to 20 ft lbs. Next ste...

Figured I'd stir the pot, been a few days and I was enjoying this thread lol https://youtu.be/u-MH4sf5xkY That video does a great job of explaining the science. 8) All the BIG TORQUE guys need to watch that video. :shock: Now I will say that airboats are different from a car because an airboat can'...

I really didn't expect much useful input on engine mounts from a CM guy, don't ya'll call em motor mounts or something? Watch the whole thing for sure, always good for more laughs. But I think Ricky was talkin about gear box boats at 54 seconds on the timeline. :stirpot: :stirpot: https://youtu.be/...

You just need to bite the bullet and put a gearbox on that A/C motor. Just think of all the prop shaft torque that you could make with a gearbox. A 1.5 ratio would increase the prop shaft torque by 50%. That is a game changer.

CMB, All good for me, a couple thoughts. Between #5 and #6 I say sure. I think you are sand bagging on #6. With 2.88 of gear your set up is gonna make more prop torque early on. The "Theory" that I am proposing is that thrust is going to be reasonably linear with the engine torque curve during prop...

Here are the main caps, main bearings and ARP main studs for the LOW TORQUE LS: https://southernairboat.com/wp/wp-content/uploads/rtMedia/users/171/2019/06/0518191605-800x450.jpg The main caps are stock LS main caps. Nothing special. P/N for the ARP main studs is 234-5608. Main studs are made from 8...

So we agree on items #1 thru #4. How about this for items #5 thru #9: 5. Measure on the thrust tester the time it takes to go from idle to 1000 foot lbs of thrust. If your BIG TORQUE A/C motor can't make 1000 foot lbs of thrust, we will drop to 900 foot lbs of thrust for the test. 6. Quickest time t...