Castle 1717

[Unsullied_Spy]

I'm curious why they would put a 6mm shaft on it, they are basically building it for US and other future RC-M nut jobs and we all run 5mm shafts. If it has something to do with a helicopter needing a 6mm shaft or something, put that shaft on the Heli version with the ground down fins and give us the 5mm shaft! I'm not going to pitch a huge fit over it because I bought the motor before there was anything really known about it (said 5mm shaft on the chart, but it wasn't the only error) because I had faith in CC that they wouldn't do something so stupid as to give us the shaft like this.

[bruce750i]

No worries guys, It's not hobbysh1tty were dealing with. Maybe a misprint warranty that still covers a grinded shaft and/or a easy rotor swap out?

How about 8mm mod 1 pinions? + with Mikes 8mm-6mm adpt.?

[nitrostarter]

Thats just beautiful...

[himalaya]

+1 on Unsullied_Spy

[Semi Pro]

45k rpm max is kind of a let down

[shaunjohnson]

Originally Posted by Bondonutz

Drill press,emory cloth,lotsa beer for patience,Repeated oil dips.
Shouldn't take to long for a 1 mm ?

common bondo! we can do better than that!
i'd go with removing the rotor and finding some way to tail-stop it then machine with a carbide tip in the lathe.

[1truckerdan]

If yall are looking for 6mm bore pinions ......look here http://www.kershawdesigns.com/,,,scroll to the bottom of the page select "pinions" and again scroll down select "mod 1 pinions"and the 6mm mod 1 are at the bottom.
.

[lincpimp]

My main issue is that I have a ton of 5mm bore pinions, and I only buy 5mm bore pinions cause I only buy motors with 5mm shafts...

I guess this 1717 motor can go in the 1/7 scale on road project I have, I was going to use a kb45 xl motor, and had mike enlarge the center of his 2 speed adapter to 6mm to fit that shaft. This has to have a custom made motor mount anyways... Sucks that I cannot use it with the lst (although I could if I use the 2speed adapter with the losi tin gears...)

Just a bit miffed that the info was wrong... Not much I can do about it now, my CC was charged yesterday and I am sure I will see the motor next week.

[Unsullied_Spy]

Originally Posted by Semi Pro

45k rpm max is kind of a let down

I was curious what the RPM limit on these would be, I was expecting it would be 60,000 like the 15** motors since even their 2220 (or 2225, I don't remember) has a 45,000 limit. I don't plan to push it past 35,000 but it's always nice to know you have the headroom for safety or to push it faster if you so desired.

[NickRummy]

Got mine today. Thing is massive!



Century Heli has 6mm mod 1 pinions in 9-11 teeth. Apparently pretty common for heli applications?

[Unsullied_Spy]

Must be a heli thing, probably 600 sized. How good are those pinions? If they aren't properly hardened we'll wear those things out in no time.

[Pdelcast]

Sorry guys -- we just realized that the car versions of the 1717 were incorrectly listed as having a 5mm shaft.

About the 45000 RPM limit -- at 45000 RPM the magnets have a centripetal force of over 1500lbs/sq in on them (about 30,000 Gs -- seriously...) -- that's about the physical limit of the kevlar reinforced magnet structure. To go any higher, we would need to get a stronger material than Neo/iron/boron magnets. :(

We just don't know (yet) how to hold the structure together at above 30,000 Gs.

[nitrostarter]

Originally Posted by Pdelcast

Sorry guys -- we just realized that the car versions of the 1717 were incorrectly listed as having a 5mm shaft.

About the 45000 RPM limit -- at 45000 RPM the magnets have a centripetal force of over 1500lbs/sq in on them (about 30,000 Gs -- seriously...) -- that's about the physical limit of the kevlar reinforced magnet structure. To go any higher, we would need to get a stronger material than Neo/iron/boron magnets. :(

We just don't know (yet) how to hold the structure together at above 30,000 Gs.

Maybe you guys should contact NASA. They test that stuff out!

[lutach]

Originally Posted by Pdelcast

Sorry guys -- we just realized that the car versions of the 1717 were incorrectly listed as having a 5mm shaft.

About the 45000 RPM limit -- at 45000 RPM the magnets have a centripetal force of over 1500lbs/sq in on them (about 30,000 Gs -- seriously...) -- that's about the physical limit of the kevlar reinforced magnet structure. To go any higher, we would need to get a stronger material than Neo/iron/boron magnets. :(

We just don't know (yet) how to hold the structure together at above 30,000 Gs.

Very thin carbon fiber tube will do the trick. It's been used in very high RPM motors.

[Unsullied_Spy]

So we have to grind down our shafts, drill our pinions, or find new pinions?