Whiplash P Sport Hydro Build

[Shooter]

Yep....definitely a problem if the teflon tubing spins. I roughen mine up with a coarse file for the first 1" length. Rough to the point that the outside looks like it's growing hairs. Then, a few drops of CA, slide her in, and no problems. However, I can undersand the argument of 'one more thing to go wrong' though.

Hey MadMike - How light is your LSH? Mine is under 5lb with 5000mah.

Hey Regular Mike - Let me know when you want those decals....send me the dimensions!! I'll shoot you a text as well!

[Hydrozz]

I've used with and without teflon. Never had a problem with teflon. I too rough it up and lightly glue it in place. The extra bend in stuffing tube might help with the spinning. To me, spinning a shaft in a tube, lubed up. With teflon there seems to me to be a little more friction. Could depend on your bends. When I do build one without a linning. I Lap my cable in the tube. Does seem to help in a more free spinning cable. Just my 2 cents.

[jfrancisco892]

It's been settled. S bend and no Teflon it is.

[detox]

Thread is dead. I would like to see this S bend.

[jfrancisco892]

Lol. I'll get to it. Plan is to get it running by next Sunday.

[mojoracer]

You guys crack me up LOL

I will not be running Teflon in any of my NEW builds. I don't run Teflon in my Q sport hydro AND it has an S bend. No one has been able to convince me that Teflon has less friction (AKA faster) than a non-lined stuffing tube (assuming everything else is equal).

About the S vs. the J bend... Ask yourself this, in conditions that have a very long drive shaft or "prop shaft" (think heavy capacity, long wheelbase trucks) nearly all of them have a "shaft" carrier bearing at some point along the length of the drive shaft. Why would they do that? I am thinking to support the shaft and minimizing flexing (shaft whip)?

Our flex shafts are the same only worse because they are more flexible meaning they need to be supported; hence an “S” bend where it is supported better than a “J” bend.

I will also say there are many boat out there that are very fast with a “J” bend and Teflon… That is what makes this hobby so great!

Later,
Mike

Mike you are on the right track about shaft "whipping". Long wheel base trucks have multiple piece drive lines is to increase the 1st bending mode of the drive line. 1 long tube has such a low frequency 1st bending mode, that the vehicle critical cut-off speed would be way to low for highway use. This is why many light duty pick-up trucks with 1 piece shafts are speed governed to not much more than 90 mph . The same truck with a 2 piece drive line, or a huge diameter 1 piece shaft could probably run up to 120 MPH or more. Most trucks over 130" wheelbase will use 2 piece drive shafts with center bearings. I have wondered what that flex cable could be doing inside of the tube at certain speeds...

[Shooter]

Jimmy - You gonna get this thing done or what???

Interesting stuff Bob. I remember reading that aluminum (less mass) driveshafts were a huge upgrade to improve the max rpm prior to resonance. Kind of supports the use of a wire drive??

[jfrancisco892]

Jimmy - You gonna get this thing done or what???

If there was a field of p sports ready to race I would have more motivation to get it done. It will get done. I'm sorry it’s taking so long, I have been to Norwalk for the NHRA event for 4 days, Eldora Speedway for the kings royal, the gold cup on the Sunday after the kings royal on Saturday, Cedar Point last weekend, and spent some time with family this past weekend. Also taking a college class right now and working full time lol. I want to finish it with my dad as he is one of the most talented individuals I know when it comes to building and fabricating just about anything. He has been working Saturdays every week, so I am waiting for him to have some time when we can enjoy putting it together RIGHT. It is almost done I just don't want to rush it if I do not have to.

I'm just rambling but it sounds like p sport is starting to get some interest. It should be a fun class with some fast boats. It's gonna be competitive if I were to guess, as everyone in the club is extremely knowledgeable about building boats and getting them running well. Looking forward to the next club race. My last day before I can legally consume ADULT beverages

[detox]

Prebend and trial fit "S" stuffing tube before gluing into place. I would not set strut too deep while doing this. Allow for some strut height adjustment. My strut height is about 5/8" from bottom of stern on setup board.

[jfrancisco892]

Prebend and trial fit "S" stuffing tube before gluing into place. I would not set strut too deep while doing this. Allow for some strut height adjustment. My strut height is about 5/8" from bottom of stern on setup board.

So 5/8 from the bottom of the hull to the bottom of the strut?

[detox]

So 5/8 from the bottom of the hull to the bottom of the strut?

Yes. Download Aquacrafts UL-1 user manual from their web site. Lots of good Hydro info there.

You will also have to anneal (soften brass) your 1/4" stuffing tube. Heat areas to be bent to Cherry Red (or just before turning cherry red) using propane torch then let cool. This will make bending LOTS easier.

[jaike5]

Put appropriate size cable inside the tube when bending , helps prevent crimping the tube.
cheers, Jay.

[tjcast]

Current Whip has .187 cable, no Teflon, 1/4" stuffing tube. Currently has J bend but unless greased every heat will occasionally have some 'vibration' noise while running. Next build will have an S bend.

[Shooter]

Tom's boat absolutely zings!!!

[tjcast]

Jimmy's run against my Whip a few times in the P- Limited setup so he knows what it can do. Too bad he won't be at practice so he can see the new and improved P-Sport Whip !