MADD CATT -41" fantasim saw build

[Chrisg81983]

I never once had a problem with teflon spinning in brass. It makes a much nicer drive train. I spin motors in excess of 45,000 rpm with no problems. If you want you can also make sure inside of brass is clean and degreased then take some shoe goo and put a thin layer on Teflon and slide into the brass. Let this set up for a few hours and you will definitely have no problems. Almost all the people running high speeds with hpr's & mhz's use Teflon. Problem only occur from a few reasons either they use too thick of grease and second the lack of maintenance. The grease makes its way to the outside of the Teflon and makes a slick surface between brass and Teflon causing it to spin with ease.

[Cooper]

I definitely agree with you Chris, I used heavy grease before and had Teflon heat up and spin, melt, and break a flex. I know it was from the grease because it was on a reliable setup that I never had problems. I would rather have to relube more often than have deal with a twisted liner.

[keithbradley]

I use pretty thick grease and have never had a problem...I don't use that much though, so maybe that's the difference.
The fastest boats in the world are running Teflon, no doubt about that. I have one SAW boat that has no liners. My mystic just runs 1/4" tubing, no liner. When I grease the drives on that boat and make a few laps with it then bring it in, the hull is full of smoke (It actually works better with just a thin coat of grease on the shaft, and a little bit of water to mix in). It clearly gets hotter than my boats with Teflon liners. I would definitely recommend Teflon to someone with SAW aspirations.

Cooper if you go Lehner, expect to lower kv by 10-20% for the same RPM (example 1600kv Neu may be similar to 1400kv Lehner in actual RPM). Feel free to email me if you need info on anything when you're ready to order them.
Also, allow 1-2months from when you order to receive motors. The fastest I think I have ever received them is just over a month.

[Cooper]

Good to know, thanks. When I get closer to purchase I'll get some input from ya

[cugino]

Do you anyone know, why Lehner states their motors KV on load, nevertheles all other motor manufacture states motors KV with no load?

Lehner behavior doesnt mean any sense for me. How can be Lehner 100 sure with motor efficiency at different type of load (for ex. low voltage and hi amp or hi voltage and low amp - efficiency will be different at same input power)?

Or I ask another way: at what conditions Lehner states their KV?

[iridebikes247]

Never had an issue with teflon. I think its agreed upon that teflon will not fail in even the highest rpm setups. I have lightly scuffed the outside of the liner then glued into place, removal is easy.

One must pay close attention imo when installing a liner, motor must be well aligned, flex should never come loose, etc. Something tells me Cooper probably already knows this lol. I spun a liner when I first got into FE motor was poorly aligned with flex (bought the boat built so of course it wasn't my fault )

[nata2run]

Do you anyone know, why Lehner states their motors KV on load, nevertheles all other motor manufacture states motors KV with no load?

Lehner behavior doesnt mean any sense for me. How can be Lehner 100 sure with motor efficiency at different type of load (for ex. low voltage and hi amp or hi voltage and low amp - efficiency will be different at same input power)?

Or I ask another way: at what conditions Lehner states their KV?

This could be answered in a very complex way, but it makes perfect sense why they do what they do. They are basically stating the KV of the motor under load at maximum efficiency "the right load within its limits where it performs the best". That way you can calculate for best performance and get an idea of true rpm. True, that load on the motor play a role in how efficient it is, and different loads will produce different results. But electric motors are not intelligent, and will attempt to spin at the rpm they are suppose to at a given volt almost regardless of load (that's why they cook) I believe the Hi-Amp are designed to take a bit more current than the standard, and can be slightly "over powered" my philosophy anyway.

[Rocstar]

Never had an issue with teflon. I think its agreed upon that teflon will not fail in even the highest rpm setups. I have lightly scuffed the outside of the liner then glued into place, removal is easy.

One must pay close attention imo when installing a liner, motor must be well aligned, flex should never come loose, etc. Something tells me Cooper probably already knows this lol. I spun a liner when I first got into FE motor was poorly aligned with flex (bought the boat built so of course it wasn't my fault )

On the flip side, I've never had an issue running "no" Teflon on high RPM setups. While I've never had an issue with using Teflon either.....I'm just throwing it out there.

[stelerzman]

So, what's going on with the MC, Cooper. She's a very impressive boat, great job on the build. Looking forward to more videos

[Cooper]

Hey guys, I took a bit of break, didn't have as much access to water as wanted and got limited time,, but this coming summer will have more videos and more wrecks!! Gonna mess with some more prop work with this hull and push it till something gives :).

[srislash]

Glad to see you back buddy. Mine is going now too(when I get time).

[Local Boy]

Thank you very much Cooper for your time and dedication to this thread... You do beautiful work!

You have covered so many aspects of building and modifying your boat...it is amazing to me ... as I have learned, and continue to learn, so much from you and your experiences....

I particularly enjoy seeing how you evaluate your problems and over come obstacles, while improving upon your design and set up...

Please keep up the good work, as you are providing a huge resource for us newbies, to begin to understand the various dynamics involved with RC Power Boats...

I remain grateful...

Aloha

[Cooper]

Thank you very much Cooper for your time and dedication to this thread... You do beautiful work!

You have covered so many aspects of building and modifying your boat...it is amazing to me ... as I have learned, and continue to learn, so much from you and your experiences....

I particularly enjoy seeing how you evaluate your problems and over come obstacles, while improving upon your design and set up...

Please keep up the good work, as you are providing a huge resource for us newbies, to begin to understand the various dynamics involved with RC Power Boats...

I remain grateful...

Aloha

And its comments like that making it all worth while!! Thank you. I do have to say that I have just passed on the knowledge I have obtained from others. Watching and asking others builds on this forum is a wealth of good useful tips, guides, and lessons learned. And if you can't find it, ask as others are always willing to help. Tips on building are just as good as mistakes made, showing what to do and what not to do :). Thank you!!

[Cooper]

Well after a little time away from the water I'm finally back getting wet!!! Got the MADD Catt out and have some repairs to do on the one drive line, a little too much prop with a little too much throttle netted me a twisted flex. I made my own drive dog/shaft so I would never lose props again. Well I still have the drive line and prop but the flex let loose in the stuffing tube. It's gonna be a **** to get to but I'll fix it!!

The shaft and stinger,

And the problem area, short as possible tube and heavily reinforced, but not enough for a flex to let loose at 50k rpm!!