Geoduck belt drive

jetnoise
Posts: 19
Joined: March 22nd, 2015, 2:44 pm

Geoduck belt drive

Post by jetnoise » March 7th, 2016, 8:09 pm

I am building a engine cowling for my Geoduck dose anyone have pictures of the timing belt propeller drive for a single engine geoduck

AJW
Posts: 213
Joined: August 23rd, 2014, 4:43 am
Location: Scotland

Re: Geoduck belt drive

Post by AJW » March 9th, 2016, 2:10 am

Do you have the plans for the craft?

jetnoise
Posts: 19
Joined: March 22nd, 2015, 2:44 pm

Re: Geoduck belt drive

Post by jetnoise » March 9th, 2016, 10:36 am

2 sets and set of surveyor plans.
Last edited by jetnoise on March 9th, 2016, 11:12 am, edited 1 time in total.

jetnoise
Posts: 19
Joined: March 22nd, 2015, 2:44 pm

Re: Geoduck belt drive

Post by jetnoise » March 9th, 2016, 10:56 am

yes 2 sets I bought plans in 2000 then received a set when a bought a unstarted geoduck off ebay. they both only show only the v-belt. one of the benefits of a cam belt is the pulley can be smaller and thus less weight for the same hp.

AJW
Posts: 213
Joined: August 23rd, 2014, 4:43 am
Location: Scotland

Re: Geoduck belt drive

Post by AJW » March 9th, 2016, 3:04 pm

I'm using the Geoduck carbon belt drive set up idea on my 16' X 7.5' Surveyor coupled to the 76" carbon prop Bryan makes now. I haven't started it yet as I'm waiting for my bits to cross the Atlantic. I will be able to supply pictures in a few weeks once I have built the thrust drive but not sure if it will be exactly the same as I'm using a Kohler 40 for my power unit.

Bryan at Amphibious Marine is supplying all my bits so he would be the best person to talk to.

jetnoise
Posts: 19
Joined: March 22nd, 2015, 2:44 pm

Re: Geoduck belt drive

Post by jetnoise » March 9th, 2016, 10:12 pm

Thanks AWJ. Are the pulleys smaller than the v-belt pulleys? I didn't think you could run a flat belt through a 90 degree bend how does it get the power from a vertical shaft to the prop pulley? I will be looking forward to see the pictures . 40 hp I don't think I've seen a super surveyor. please post some videos when you take it out.

AJW
Posts: 213
Joined: August 23rd, 2014, 4:43 am
Location: Scotland

Re: Geoduck belt drive

Post by AJW » March 10th, 2016, 1:19 am

Pulleys are a lot lighter as top pulley is anodised aluminium, not sure on size or weight difference, as I'm still waiting for them. The toothed belt doesn't go through a 90* turn on this set up, although Bryan has managed to do that with the carbon 90 drive used on the AM 14.

Once I've built my thrust & lift frame I will post pictures, but I wont be giving drive ratios away as that wont be fair on Bryan, who has done all the work in making this system a viable alternative to the V belt drive.

jetnoise
Posts: 19
Joined: March 22nd, 2015, 2:44 pm

Re: Geoduck belt drive

Post by jetnoise » March 11th, 2016, 8:49 pm

Thanks I found a picture of the drive that will help me design my engine cowling. But I'm always ready to see another hovercraft.

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jchovernut
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Location: Longwood, FL
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Re: Geoduck belt drive

Post by jchovernut » March 14th, 2016, 8:32 pm

There's a fella in PA that has a 1.3 Geo on his Super^2 Surveyor (highly modified Surveyor), but it is a twin-engine & has the Gates PolyChain drive on the thrust in lieu of the multi-band v-belt driving Bryan's carbon prop.
Here's a link to a web gallery of that SEV. Note that it's highly modified!!
Surveyor^2
John Carter
SEVs: Vanguard, FanTastic, Prospector, Explorer
Others: StarCruiser, UH-18P, RX2000
http://www.hovernut.com

AJW
Posts: 213
Joined: August 23rd, 2014, 4:43 am
Location: Scotland

Re: Geoduck belt drive

Post by AJW » March 15th, 2016, 2:33 am

Any idea of what hp the lift motor is? I toyed with putting a 22hp kohler on mine for lift & the kohler 40 for thrust, but when I looked at the weight that would be sat on the rear deck, I quickly changed my mind. ;)

Do you know what that Surveyor flew like?

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