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>> Home > Boat Building Blogs > Jet Sprint Boat
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mdlbt.com/27320
Jet Sprint Boat Print Booklet
Author: Rod   Posts: 12   Photos: 43   Subscribers: 1   Views: 1139   Responses: 84   |   Most recent posts shown first   (Show oldest first)

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mdlbt.com/27456
Progress on Jet Sprint hull - Posted: 15th Apr 2017
Completed all the clay work. Now set in
casting plaster and waiting to see how it turns out in a few days time
Have used 50 kgs of clay and 50 kgs of casting plaster so far.
Next target is designing the top of the boat and back to clay and plaster again whilst the hull is being gell coated and fibreglassed
Will report on the casting result shortly

Attached Photos - Click To View Large

Response by John on the 15th Apr 2017
looks good, well done!
Response by sandkb on the 19th Apr 2017
Coming along fine Rod. 👍
Response by rolfman2000 on the 1st May 2017
Wow. That is some serious work on a serious size mould. I'm looking forward to seeing the first hull come out of it. The interior mould is going to be a pain, ad unless you have some good shots of the actual craft, it's going to be hard working out what goes where. And allowing for all the mechanics to fit inside. It's coming along well Rod. Best wishes, Dave W.

mdlbt.com/27321
Jet Sprint Boat - Posted: 8th Apr 2017
Have been trying to source a 1/4 scale hull for a jet sprint boat but not successful so decided to make my own
Borrowed a small model identical to the one I wanted and set to scaling it up by 2.5 times
I have shown the start of the journey and will continue to post development until it is in action
Have sourced 1/4 scale driver and navigator together with jet unit and electric water cooled motor which will need to produce 3 to 4 hp to drive the jet unit shaft
Hope you all like it because it's been really interesting so far
I should be in a position to pour the mould shortly and then have a fibreglass hull taken off😆

Attached Photos - Click To View Large

Response by philpjuk on the 11th Jun 2017
Hi Dave,sorry the problem with sponson lift is with a prop driven strimmer powered boat,it is always the same sponson that lifts and this is due to prop torque.As it is a "pickle fork" type boat I am going to make it asymetric putting the hull nearer the lifting sponson and move the fuel tank and radio battery from behind the motor to the front.I asked the question to see if anyone thought I may have trouble with my jet boat,(this is a mono hull).This is all my fault,I insist on fitting engines with far too much power into every thing!cars,motorbikes and boats,(I have bought a coventy climax fire pump to fit in my 11 foot sailing dinghy!).
Response by Dave M on the 11th Jun 2017
Hi Phil
No problem I enjoy tasking opportunities to expand my knowledge. Weight distribution can be critical in marine craft and your solution should help control the lifting problem.
With the mono you should not experience the problem, but with lots of power and a very aggressive jet of water I would expect the initial 1 to 2 secs to be interesting and you will need to be on your toes to keep it straight!
Response by philpjuk on the 11th Jun 2017
Thanks Dave,will build up to speed in increments,as my mate says "the throttle works both ways"!

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