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SKF & NSK are always solid choices.

Thank you for the feedback! I have no illusions that a stock OS will pull it for sure. The goal was FE P-Spec/P-Ltd class but maybe it'll take a full P-Spec electric to run it?

I haven't been on here in years but I went through my old RC stuff the other day and found my half-built stash of stuff and tons of files with ideas and concepts. Big plans back then to get into FE tunnel racing. Got a PX-300 (?), nice kit, but it was never finished. Got all the cool telemetry...

Very nice. The guy is using a Prusa i3 Mk II printer which is a very good kit and it is also an open source design. The Anet A8 is a clone of it and technically it should be possible to print this model with it. The designer spent a lot of time on these parts. They are not done with any infill...

The Anet A8 comes with Cura. On the tests I've done a 10% infill is way better than Vase mode. The infill makes it very stiff and you'll get water tight compartments for free.

Yes, it can be done in two ways. Either the part is designed as a solid and then those details can be set in the slicer (wall thickness and infill), or the part can be designed as a hollow part which is much more complicated because you as the designer needs to draw every single detail. I...

It's a cheap Chinese kit called Anet A8. It's less than $200 and to some extent it shows but I'm positively surprised by what it can do. The electronics is a bit shoddy and I don't trust it running without supervision if you know what I mean. Which one do you have? If it can print 24" pieces...

Thank you. Printing the hull in sections is the way to go. The test print turned out to very stiff. I could possibly have managed to break it with a lot of force. The full size hull could possibly be stronger than a design in wood. The PX-300 wood-over-frame kit is strong but I think I can...

Here is a picture of P-Spec / P-Ltd tunnel design I am working on. It's printed in ~1/4 scale. The final design will be around 32.5" - 33.5" in length. It should work but I think the final hull needs a thin layer of fiberglass and epoxy for a smooth finish and to be able to paint properly...

Gyro controlled outboard tilt. That should be ok too I guess. So much fun that can be done with new tech. A Raspberry Pi Zero is $5 or so. That's got several times the horsepower of the computers on Apollo. As for hull stability the Dynamic CG is the key. It should move around as little as...

Very useful clarifications here. Max length for a P-Class tunnel is 34" from what can understand, and that would be including the center airfoil if it is set-back (instead of in-set). Center of lift should according to theory be as far aft as possible. Preferably aft of CG to achieve stable...

Thanks for the answers and yes, points E and F are somewhat contradictory. So other than that auxiliary wings are allowed even if the intent of the rules seems to be in favor of having boats look scale. I got some ideas I'm working on and wanted to make sure those are not dead-ends.

Straight question: Do the rules allow for additional wings and spoilers to be added to a tunnel hull?

Edited out. It was OT.

Analog servos should be used with PPM otherwise they will fail. No ifs ands and buts about it. Digital servos can be used with PPM and HRS mode (These are the selections for the 3PKS).

Other than being an Outboard Power Head, what are the other differences between this version and a regular OS? Are the timings different or does it use a standard OS liner? Looks great btw. Thx.

Surely a Binford 6100 something

Because they are the same and there is no difference between on-road/marine in that case...... I would guess.

But yes, I agree. A car engine with good timings and a boat pipe and big carb + nitro will run great. I'd love to test a car pipe on a boat engine.

The power band is controlled by the engine timings and the shape of the pipe. A very simplified rule of thumb is that the higher exhaust timing (the longer it stays open) the higher up in the rpm range peak power can be found and a pipe with shallow angles gives a wider (but lower peak power)...