Whiplash P Sport Hydro Build

[kevinpratt823]

I've tried a good handful of props in my whip(1515/1Y/4s2p)
H7 was good overall at 63 mph, the faster props lost a bit in other areas like coming out of the hole and walking, but H6 and H10 were both good, Oct 1650 got me 71 mph on both days I ran it so far. Haven't been back out again since. I liked all these better than M/X series personally.

[longballlumber]

Oh boy,

Now we are in trouble.... Looks very nice Tom. Jimmy where's your pictures?

Later,
Mike

[jfrancisco892]

Oh boy,

Now we are in trouble.... Looks very nice Tom. Jimmy where's your pictures?

Later,
Mike

Lol. I'll see what I can muster up before the last race of the year. Need to get my butt in gear and finish this thing. Too much other stuff going on but it's pretty close to being done.

[tjcast]

Not finished but ready for water on Wednesday!

[bozo586]

tom really looks good! maybe another winner. good luck-will be there wed.

[jfrancisco892]

Time to pull this thread from the dead as she's finally done. Not sure how many people will even see these posts with the e-mail notification issues on the forum but here goes.

Let's talk about the turn fin first. I'm not gonna take any credit on this as my dad did all of the work on it. All the machining on this was done on a cnc mill and my dad definitely knows what he is doing. The leading edge was done on a mill and each side of the fin was machined as opposed to most turn fins where it is only machined or filed on one side and makes the point by meeting the back side of the turn fin. The adjustment slot was also done on a machine and the radius matches the bracket perfectly to be adjustable. The turn fin mount was also drilled and tapped and a nyloc nut on the back of the mount for a lock nut. The bend on the fin was made by a die my dad made. It came out great and I have had good success with them with my UL-1 so I think it will be a slam dunk on this boat.
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[jfrancisco892]

For the stuffing tube I had my dad make me an alignment pin that is 3/16" on one side to go into the collet and the other side was machined to match the I.D of the 1/4" brass tube. Just a matter of test fitting, pulling it out and making slight adjustment until the shape is what you are looking for. There is a slight "S" bend in it even if it might not be apparent in the pictures. This was done intentionally as I wanted to provide support with as little resistance as possible. My dad had some epoxy that was water proof and it seemed to work out pretty well. Used some wax to keep the contained in the joint area, and used a grinder with a carbide burr to clean up some of the rough edges inside the boat and on the bottom as well.
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[jfrancisco892]

Man I don't know how I would do this boat stuff without my dad as he helps me out a ton. Here is another machining project I gave him which came out perfectly. To be able to get a wrench on the collet either the collet would have to be put on farther down the motor shaft or the screw heads needed to be recessed. I elected for the latter as this keeps as much of the collet as possible in contact with the motor shaft. The motor mount was counter bored to allow the heads of the screws to be perfectly flush with the face of the motor mount. The screws to be put in those holes were shortened the amount of the counter bore so both the top and bottom screws had the same amount of thread engagement in the motor itself. The bottom holes did not need to be machined as they do not impede the ability to get a wrench on the collet. One more thing to mention is that I did notice some runout on the collet, and was wondering if anyone else has had this issue with an octura collet or could recommend another brand to try before handing it over for my dad to machine it and put a bushing in it to get it to run true.
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[jfrancisco892]

For the flex cable I contemplated quite a bit as to whether to solder or not solder the end where the cut is made. I decided to go the Pete Luzenski method and chamfer the end of the flex cable without soldering it. I did not take any pictures of it, but I also had my dad do some machining on this as well to do the flat on the prop shaft for the set screw of the drive dog. The prop on there right now is a Grimracer L42x66. I feel this is a pretty conservative prop for the setup and a good place to start from. There is roughly a 3/16" gap between the drive dog and the strut bushing. I am not sure if everyone has the strut bushing protrude from the strut but I think it allows the bushing to free wheel or float more with no intrusion from spinning from contact with the strut.
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[jfrancisco892]

The last small item was to put the antenna tube in the boat. It was rather tricky to find an open flat spot on this hull but I eventually settled just left of the speed control. I drilled the hole about .015" smaller than the threads on the antenna mount and just threaded it into the wood for nice snug fit. The most tricky part of this was feeding the antenna through the mount and tube.

I think that just about covers everything in the build. This lovely Michigan weather has prevented me from doing any running of it yet but hopefully I can get a couple test runs in before the first club race in a couple weeks.
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[ray schrauwen]

Weather up here in Canada is bad too. Frozen solid still.

From post #68 down your attachments do not work. It would be nice to see your hard work.

[Fluid]

None of today's photos open for me. It is not uncommon to see some runout on some Octura collets.




.

[jfrancisco892]

I just re-posted all the attached photos so I think that should fix the problem. I have never had that issue before.

Anyways, my dad is going to machine the collet and put a bushing in in to get it to run true.

[jaike5]

This is a falsehood Ray,
I was down at the lake today and it is open water as far as the eye can see, now the wind was blowing to Rochester but not til a hundred yards out, before that it was like glass. a little cold today, tomorrow its clear and sunny and WARM! so to speak. I'll be down running a few boats checking out the winter mods.

Cheers, Jay.

[ray schrauwen]

Cool, I'm working on a different vehicle as my Grandprix will not pass emissions. They changed the test this year, buggers.

That and the rocker panels are completely rusted out, tires worn out, no mufflers... time for the wreckers...