Whats needed to run dry

Airboats with smaller powerplants.
hovercraft57
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Whats needed to run dry

Postby hovercraft57 » Thu Oct 11, 2018 3:10 pm

Hello
I going to build a Lone Star rascal airboat. The river I'll use it on will mean I will have to run over wet slimmy rocks about the size of an apple.
If the boat is carrying me (250 pounds ) and hull bottom has UHMW poly any idea what horsepower I'd need to have to take off from a stop if I was these rocks.
Thats a tough question but there is lots of experience in this forum. Thanks ED

One Eyed Gator
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Re: Whats needed to run dry

Postby One Eyed Gator » Thu Oct 11, 2018 3:44 pm

You may get better infomation if you list the size and weight of the hull.

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OneBFC
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Re: Whats needed to run dry

Postby OneBFC » Thu Oct 11, 2018 4:47 pm

Wet slimy rocks that a human can hardly stand on is about the same as ice, so, you will need less power than usual.

10lbs/hp will likely suffice, but it won't be too exciting.
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,85+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy

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Slidin Gator
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Re: Whats needed to run dry

Postby Slidin Gator » Thu Oct 11, 2018 7:43 pm

8 lbs/ Hp or less for a good all around performer. But Russ is right, 10 will get you off those rocks.

Sharp rocks scare me though!
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

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Rick McC.
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Re: Whats needed to run dry

Postby Rick McC. » Thu Oct 11, 2018 9:05 pm

I agree.

I had an airboat years ago that would have never have run dry ground (I never even tried), but it had no trouble bumping up and over rock and oyster bars.
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Lwells
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Re: Whats needed to run dry

Postby Lwells » Thu Oct 11, 2018 9:15 pm

I have a 16ft hamant with a 470 angle valve 6 cyl. continental with a synsenich 2 blade (adjustable prop) it has two 4 passenger seats on tubing that the whole seat assy can be removed by taking out 4 bolts on each assy and removing them. I'm saying this due to if someone responds they will have an idea of whether I could lighten it up if wanted. There is no poly or slicky on the bottom. Boat is aluminum. No walk around, no grass rake. It takes about 20 minutes to make it a one seater. Anyway, I have no idea how much it weighs and have always been afraid to run it up on a grass area due to thinking it won't run dry. It has very good power and I have run up on dry areas and had to go on across them and it went very well but there is a difference in already running and hit a dry spot and starting on dry so I have always wondered and I had me and 3 others on board when I had to run it dry for about 100 ft. So tell me what you think.

hovercraft57
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Re: Whats needed to run dry

Postby hovercraft57 » Thu Oct 11, 2018 10:38 pm

The One Eyed Gator suggested I mention the size and weight of the hull . I don't know how I forgot that. Its 5 feet wide and 10 feet long.
I am going to use a snowmobile engine that puts out 120 hp and a reduction to turn a 6 foot prop.

Sniper
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Re: Whats needed to run dry

Postby Sniper » Fri Oct 12, 2018 6:39 am

sounds like that should do it with no trouble, if they are round smooth rocks it should take very little effort especially if they are wet
Sniper You can run but why die tired, If you heard my shot you were not the target
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hovercraft57
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Re: Whats needed to run dry

Postby hovercraft57 » Fri Oct 12, 2018 9:12 am

to Lewells
Yes I agree about the difference between starting off from a dry spot and running over a dry spot. Your airboat sounds like a beast. Thanks ED

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OneBFC
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Re: Whats needed to run dry

Postby OneBFC » Fri Oct 12, 2018 10:01 am

hovercraft57 wrote:The One Eyed Gator suggested I mention the size and weight of the hull . I don't know how I forgot that. Its 5 feet wide and 10 feet long.
I am going to use a snowmobile engine that puts out 120 hp and a reduction to turn a 6 foot prop.


5 foot wide with a 6 foot prop.... Well, you will experience considerable torque roll and your cage will extend beyond the hull boundary which will make it vulnerable to impact.

suggest you reconsider a few things. You do have enough power.

Again, just my opinion.
-Russ
-----------------------------------
The only thing stopping you is FEAR
400+hp Ecotec, 12x7.6 DBDO, 80" 3B Maximus, 2.3 OX,85+mph, water = purely optional
Life begins at 2 BAR, Just a good ole boy


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