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Unless your skydiver requires the jets to sit above the waterline then I don't see the advantage in a waterjet over a normal ducted prop arrangement. After all waterjets are optimised for sucking up water and squirting it out the back into air. Something that doesn't happen very much on a sub!
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True, but as model builders, most of us will try anything at least once.IT TAKES GREAT INTELLIGENCE TO FAKE SUCH STUPIDITY!Comment
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As I understand it, A water jet works best when the jet is pushing against air, Not so efficent Under water. After testing the smaller stingray with a Graupner Mini jet and Seeing it go under water and then shoot up again I dont think the power loss was that bad (But im not an expert) Its about half the push, Then again Do I want to be doing Rate 6 under water, lol.
Right, The Graupner 40mm jet will not fit the Stingray and allow you to install a Big enough WTC. So I have gone with the Kehere 28mm jet. It will be powered By a brushless motor same as Skydiver. I'm Looking at this one as a kind of Test bed, when David has done his stuff I'll hopefully do another. I have thought of a way to make the ratemaster spin and I'm reasonably confident it will work. The jet has been installed in the conventional way as it was in a pretty poor state (Having been ripped out of another model, Skydiver) the other will be winging its way to the US in a couple of days. I will take pictures tommorow and post.Comment
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Oh and the other reason I didnt want to use the 40mm one was that the intake would interfear with the big Stingray logo unerneath. Sad I know but hey!Comment
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The point I was trying to get across is that for a boat with submerged propulsors you don't need the space hogging scoops used in waterjets. If you cut the front half off a waterjet you have a shrouded prop with some fixed pre-swirl stators. If you're running a boat on the surface with the impellors above the waterline, then clearly you have got to have scoops, else they will never get to see any water!Comment
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Ok as you can see Its a bit of a hodgpoge but it will serve its purpose, Its a bit further on than this and tomorrow I will see if I can make the ratemaster spin.Attached FilesComment
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Ah!... you sneaky so-and-so: your going to put some vanes on the inside of the RatMaster that will act as turbine blades to set the door-knob in motion when impinged on by the PJ flow. You're amazing, sir.
DavidWho is John Galt?Comment
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Sorry David....Not going to do it that way, although that method was put forward by My Good lady and a few people. All will be revealed (If it works)Last edited by RCnut; 07-13-2012, 06:43 PM.Comment
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GRRrrrrrrr!Who is John Galt?Comment
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Slick!
DavidWho is John Galt?Comment
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I am the slow one here......what does the spinning door knob do? Does it help stabilize the sub?If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.Comment
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