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Not completely finished but far enough to test the theory. Hope to test next week if work schedule permits.
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Keep us informed on testing Lee.. Looks very stealthy.. Are you working with the military
Mike - One of the Montana Boys
If it aint fast make it look good
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interesting...i thougth it only on rc...Comment
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Is it wood? Composite? Machined from billet?
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I have a question? Since it's an "outrigger" or 4 point as Apel once built, does this mean that it's a Hydroplane? If so, than the sponson tips are not APBA legal, are they?Originally posted by Smitty View Post
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Looks unique and stealthy. Looks like some wood in the transom area, wood used anywhere? Why didn't you put some bevel non trip chine on the vertical side of the right front sponson? Looks like a possible grabber unless you plan to float it thru the turns? Is there any adjustment for the front sponsons or will you make other styles to quickly bolt on?Last edited by ZUL8TR; 06-15-2014, 06:32 AM."Keep Move'n" life is catching up!
No man's life, liberty or property are safe while the legislature is in session.Comment
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1) You actually had 3 questions.Originally posted by John Schubert View Post
2) The title says it is a Hydro.
3) It looks to me there is a radius on the tips of the sponsons, if it isn't .984" radius it could easily be fixed.
Let the guy experiment! What's the problem?Comment
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look at how they did in rc...outrigger are extremist fast...Comment
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Sharp looking. Good luck with the testing.sigpicWayne DiGiacomoComment
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Lee,
Suggestion. The outriggers as presently configured is very draggy. This is very typical of biplane aircraft with wire cross bracing. Make a symetrical airfoil to surround the round tubes leading and trailing edge. Less draggy by a lot and they can be adjustable by extending two tabs on the end plates of the "wing" backward and screw it to an aluminum plate on the side of the fuselage and sponson. This may be counter productive for the goal you are trying to achieve.
Also, you might find out what the bending moment of the tubes are. It is entirely possible you do not have enough strength to handle the vilolent forces imposed on the craft while underway. Thus you might bend your right sponson outrigger.
Solution. Bending moments are maximum at the cockpit center line and decrease towards the sponsons in a linear manner. Put a steel pipe through the cocpit and outboard. Insert a smaller diameter aluminum tube longer and finally a third smaller tube through the two pipes to the sponsons. Requires some structural analysis but you get the idea. stress points occur at each step down. The only way to eliminate that is a tapered tube or similar concept.
Bob Smiley -
Bob
That is exactly what Reginald Mitchel did with his WW2 British Spitfire design for the wing root structural beam, a telescoping series of tubes. He understood the structure loads and bending moments. One of the reasons there are not to many air worthy Spits, to difficult to restore the root tube due to corrosion for FAA certificate. But there are some of these beautiful machines flying.
But a good idea for this outrigger hydro.
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No adjustable control surfaces under way? ..[besides steering]. Too bad, this type of innovation leaves options to explore. Imagine movable sponsons, front to back, side to side, attitude, altitude.
It's a cool looking boat.Team TowerComment
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Why are you so argumentative Bill, I just asked A question, & that was, if it meets the hydroplane criteria & he intends to put it on a race course, it must meet the pickle fork radius rule. I meant nothing against experimentation as after all lots of boat designs came from experimentation, late 60's tunnel boats from Europe, mid 60's to late 60's Tim Butts introduced us to the merits of pickle forks although not the first but with revolutionary designs that worked. There are safety rules about pickle forks & in case you aren't aware, became a big issue in SO in ASH a few years ago with final resolution only coming at the next years' Annual Meeting.Originally posted by ProHydroRacer View Post
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All I have to say is OMG.. Give the guy a chance.. No wonder folks delete there postsMike - One of the Montana Boys
If it aint fast make it look good
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I mean no disrespect & do want him to try it, but we do have rules & they should be considered. If you want to race with total disregard to the rules, than there must be an organization where that can be done. I want to see his project work but if you as the site owner & administrator do not want to hear criticism of posts, please post it in YOUR rules or band me from posting.Originally posted by blueskyracer View Post
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Yes the sponson tips are legal. As far a construction, it does have a wood bottom and transom. The rest is Carbon Fiber and glass honeycomb panels. I didn't make the sponsons adjustable to save weight. The bracketry required is heavy. But I have provisions built in to the sponsons to change angles. If this design it close and shows some promise, I'll build rev 2 with some adjustability built in and lighter. Before I added hardware and windshield it weighed 105lbs. I've been told by several boat builders that it wouldn't work so I welcome any response. Positive or negative. I drew it up full size several years ago and after a failed attempt to buy a boat from Europe I decided it was time to try this.Lee Tietze
Machined Components
Aluminum, Try Racing Without It!
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Lee, yes I'm aware of the failed attempt to purchase a Trombata (spelling probably incorrect) & applaud you efforts. Also pleased that the sponson tips are APBA legal. The pictures does not provide an appropriate view, thus my concern.Originally posted by machinedcomp View Post
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