ProBoat HyperSport 48 Gas Mono - Prep for Racing

[Bill-SOCAL]

Next step will be to figure out how to mount a set of turn fins... at least on the right side. Hmmmmm.....

I did not realize how little room you had to work with on the transom. If I had to choose between trim tabs or a turn fin (right side) I would choose the turn fin.

Looks good otherwise.

[Darin Jordan]

I did not realize how little room you had to work with on the transom. If I had to choose between trim tabs or a turn fin (right side) I would choose the turn fin.

Looks good otherwise.

Ya... I have something in mind for a turn-fin mount. I'll get it in there!

[Jeff Wohlt]

Darin, I would be glad to make any shaft you need for that.

[Darin Jordan]

The new Spektrum Steering servo arrived... I'm using one of the new Spektrum Digital servos, in this case, an A6030, ("A" is for "Air"... The "S" series designate "surface" servos... ). The A6030 has metal gears, dual bearings, and over 270 in/oz of torque, so it should be up to the task.

After mounting the servo in the stock location, I made a new antenna mount, using a 3/16" aluminum wide flanged pop-rivet epoxied just above where I mounted the MR3000 Rx... The stock antenna location is outboard of the radio box, but it just seems to make more sense to me to just put it in the radio box lid. Gets the antenna up a tad higher as well.

I think I'll order a 6V RX pack as well, so I'll wait to secure the radio box lid until after I get the new pack.

[Darin Jordan]

To help channel air into the engine bay, and also get heat out, I opened up the stock scoop on top of the hatch, and I added some venting holes to the back of the hatch area.

I'll see how this works, and test it with and without the hatch, to see if additional fresh air is needed...

[Bill-SOCAL]

I'd hog out the entire rear exit above the radio box. Hot air is your enemy and you want to make sure you let the engine breathe.

I have also seen a few guys cut out the left side of the windscreen and install a fine mesh screen there. Gets lots of air that way and the screen helps reduce the possibility of getting washed out. On this hull you might think about doing that to the port side "window".

[Darin Jordan]

Time to mount some turn fins... I got these from right here on Offshoreelectrics.com. They are the "Extra Large" turn fins, and measure 90mm or so in length (about 3.6").

There isn't a lot of transom space to work with, but I think I figured out a good solution... I mounted them to the trimtab mounts and it turned out great.

First, remove the area from the supplied brackets, marked in black in the picture. I don't have a mill, so I just used a belt sander. Took about 45 seconds to do this, so no big deal...

Next, I opened up the inside hole to pick up the existing hole in the trim tab bracket. After lining everything up, I marked the outter holes location, then drilled it out to tap it to 4-40.

[Darin Jordan]

After tapping the new hole in the trim tab bracket to 4-40 and deburring, I installed a short stainless 4-40 screw.

Reinstall the trib tabs and that's pretty much it. Fins are solidly mounted and ready for action.

Repeat for the other side.

Fins look a little small to me, but now that the brackets are mounted, one can adjust as necessary.

All told, took about 20 minutes total. VERY easy upgrade...

[Darin Jordan]

Here are a few more shots of the mounting...

[Darin Jordan]

I'd hog out the entire rear exit above the radio box. Hot air is your enemy and you want to make sure you let the engine breathe.

Bill... I may be hogging some more out out of necessity... will have to see what needs to be done to fit a pipe in this thing....

[Darin Jordan]

Got the strut and driveshaft reinstalled.... pretty much done at the tail-end.

Going to add some drain holes in the back, but I have a plan that'll look pretty cool... will get to that shortly. I'm going to wait and see where the tuned pipe will exit first.

[bigcam406]

anymore updates on your mods? i curious to see how the tuned pipe can be mounted on the boat.im thinking about grabbing one of these,like the looks and the price,plus it doesnt have a clutch.there were 2 reviews recently in RCCAR and RCDRIVER,both said the same thing,great boat,great fun,lousy place for the exhaust (even though it was quieter than normal).keep us posted.thx

[Darin Jordan]

anymore updates on your mods? i curious to see how the tuned pipe can be mounted on the boat.im thinking about grabbing one of these,like the looks and the price,plus it doesnt have a clutch.there were 2 reviews recently in RCCAR and RCDRIVER,both said the same thing,great boat,great fun,lousy place for the exhaust (even though it was quieter than normal).keep us posted.thx

I haven't fitted the tuned pipe yet, though I do have one here... It doesn't look like getting it into the boat is going to be an issue. It still remains to be see, however, how cleanly I can position the exit of that pipe. I don't want to put a big gaping hole back there, so I'm going to take my time to get it as close to "just right" as I can. I'm going to run it for a few tanks with the stock exhaust to do the breakin and initial baseline runs... I'm taking off the additional hardware as well for this. Want to be able to gauge each update for effectiveness.


I did fire it up the other day to get the initial breakin done. I'm not happy with the throttle cable setup, so I'm going to be updating that here next, before I hit the water. It's OK, but for racing, it's going to need to be more precise and repeatable. I'll be back to working on it again once some more pieces arrive.

[bigcam406]

thx for the response.im curious to see how the tuned pipe will look.im thinking the exhaust is one of the biggest drawbacks on that boat from a design point.but the reviews say its quieter than normal,perfect for running at a park etc. but not for racing.im curious as to what props would compliment the stock zenoah as well.keep us posted.

[mickvk]

Darin, very nice work. I didn't think the steering would be weak, but now that you mention it, yeah. You're right. I look forward to your impression of your changes for further consideration - especially the muffler. Are you going to log RPMS/speed?

I appreciate you pointing me to the turn fins you chose.. I'm curious, which trim tabs are you using? If unknown, no problem, I can eye ball it.

Thanks. -Mick