Search found 7 matches

by Alex A.
Tue Jan 31, 2017 8:46 am
Forum: Airboat Tech
Topic: Belt reduction - 8M or 14M?
Replies: 6
Views: 1331

Re: Belt reduction - 8M or 14M?

If you need to have the answer to your question, maybe it can be found here: ? http://www.sitspa.com/1499.pdf It was a huge help, actually! Not only the calculation guide makes sense, as I was able to determine the pitch and profile i need (8M and HTD), but i also downloaded their catalogue and had...
by Alex A.
Fri Jan 27, 2017 2:43 am
Forum: Airboat Tech
Topic: Belt reduction - 8M or 14M?
Replies: 6
Views: 1331

Belt reduction - 8M or 14M?

Good day (or rather night :twisted: ). I am designing an airboat , and I got to a point where I need to select a belt reduction... or rather buy a belt and make pulleys myself (got an acces to cnc machine). But when I tried to make dealers tell me which type of belt I need it turned out most of them...
by Alex A.
Mon Jan 16, 2017 1:48 am
Forum: Airboat Talk
Topic: Building an airboat around an engine
Replies: 23
Views: 4629

Re: Building an airboat around an engine

I think you should build an exact duplicate and use your 200 HSP motor. That would be impossible. Now I get it, it has everything to do with diesel. Also, I think using hp as primary input for designing is wrong. Speaking of that massive russian airboat, it's engine has approximately 2 times more t...
by Alex A.
Wed Jan 11, 2017 9:08 am
Forum: Airboat Talk
Topic: Building an airboat around an engine
Replies: 23
Views: 4629

Re: Building an airboat around an engine

Some good numbers have been used in the past. 4 lbs of thrust per Hp for a correctly propped power plant is about what is to be expected. Weight to Hp ratio numbers in the neighborhood of 5:1 have been in the ballpark. 1000lbs needs about 200 Hp. Ok, but how about this: a crazy russian aero-sled on...
by Alex A.
Wed Dec 28, 2016 10:00 am
Forum: Airboat Talk
Topic: Building an airboat around an engine
Replies: 23
Views: 4629

Re: Building an airboat around an engine

Wait, wait, wait... so thrust should be = weight? Now that i think of it, there is something wrong with this: Keep boat weight to thrust ratio at least 0.5:1. That is, 2 lbs of boat weight to 1lb of static thrust. Boat will perform reasonably with that ratio. >>> delete that on line airplane calcula...
by Alex A.
Tue Dec 27, 2016 2:54 am
Forum: Airboat Talk
Topic: Building an airboat around an engine
Replies: 23
Views: 4629

Re: Building an airboat around an engine

I agree I owe you some clarifications I should've posted earlier: 1. I intend it to run on lakes, shallow rivers, snow and ice. 2. Yes, there will be a lot of custom components. 3. I think I will use a custom belting instead of a gearbox. Fortunately, I have means to construct it. Now I did some res...
by Alex A.
Fri Dec 23, 2016 9:32 am
Forum: Airboat Talk
Topic: Building an airboat around an engine
Replies: 23
Views: 4629

Building an airboat around an engine

Greetings, gentlemen. As the topic says, i've got my hands on an engine ez30 (220hp/6000rpm as i was told) and a task to make an airboat out of it. Therefore i have to figure out how much of a mass i can move with it so i can make a hull order in our local workshop. They haven't made any yet, so i w...

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