40,000 rpm........what's the problem

[Luck as a Constant]

It's like a train wreck tho, I can't look away. I have to see the carnage


Sent from my iPhone using Tapatalk

[T.S.Davis]

So if I blow a 100 or 150 motor up....it's laughable to ME.

So why bother starting this thread at all? Run your rpm and move on. Toss a magnet, boil a speedo or don't. Makes no never mind to ya.

The only reason I posted to this thread at all was so that people that actually don't laugh a bit when say their flex shaft knots don't make the same motor choice without a nogg'n full of information. RPM's don't kill. Think we've established that. It can and does work. Takes a different focus. It's all the other stuff that can go wonky while doing so. Although, it sounds like Keith may have found some motors that gave up the ghost on their own.

As for the joining a club to validate your dedication thing. Lose the chip on your shoulder man. Your not looking to drive 600 miles to race. So what. Just means you're not into roundy rounds. Doesn't make your efforts to build a boat less valid. Traveling to race and competing doesn't make your boat more valid either. That's a validation of your driving skills and your dedication to "racing".

You do NOT have to be in a club or even race to be an FE super freak. Some of the most dedicated FE guys I know don't race and don't belong to any club. There's a guy locally here that owns at least 30 FE boats. He may be thinning the heard now. I've known him about 10 years. I've seen him race one heat in 10 years. It aint for everyone. But that guy loves this silly hobby.

On a side note: Any of you ever hear a Lehner Basic 5000XL on 14 volts? Totally un-raceable so useless to me but OH! the sound...........zzzzzzzzzzooooooom

[Brushless55]

I know, I know. Just have too much time on my hands, getting way too crabby with an idle bench waiting for parts and ridiculously over-prepping a boat for a race coming up Sunday. To quote a Ron White line : "While I had the right to remain silent, I did not have the ability..."

Love that guy!

[kfxguy]

So why bother starting this thread at all? Run your rpm and move on. Toss a magnet, boil a speedo or don't. Makes no never mind to ya.

The only reason I posted to this thread at all was so that people that actually don't laugh a bit when say their flex shaft knots don't make the same motor choice without a nogg'n full of information. RPM's don't kill. Think we've established that. It can and does work. Takes a different focus. It's all the other stuff that can go wonky while doing so. Although, it sounds like Keith may have found some motors that gave up the ghost on their own.

As for the joining a club to validate your dedication thing. Lose the chip on your shoulder man. Your not looking to drive 600 miles to race. So what. Just means you're not into roundy rounds. Doesn't make your efforts to build a boat less valid. Traveling to race and competing doesn't make your boat more valid either. That's a validation of your driving skills and your dedication to "racing".

You do NOT have to be in a club or even race to be an FE super freak. Some of the most dedicated FE guys I know don't race and don't belong to any club. There's a guy locally here that owns at least 30 FE boats. He may be thinning the heard now. I've known him about 10 years. I've seen him race one heat in 10 years. It aint for everyone. But that guy loves this silly hobby.

On a side note: Any of you ever hear a Lehner Basic 5000XL on 14 volts? Totally un-raceable so useless to me but OH! the sound...........zzzzzzzzzzooooooom

Why bother starting any thread then?

[T.S.Davis]

Because you care what the answer might be or are looking for a solution to a problem. If you don't and you're not you're it just smacks of pot stirring. We don't really need that.

You asked what the big deal is about the motors then later say you don't care if they blow up so.............I don't know. Seems like waist of time. Maybe it's just me.

I went back to the start to see if I could find the point. I think the point was "don't scoff" at high rpm setups unless you can provide indisputable documentation that the motors will spontaneously combust. haha Put up or shut up kind of thing.

Isn't there an emoticon for a dead horse being beaten? Maybe a sticka fork in it emoticon.

[madmikepags]

why terry why???? read my PM

[kfxguy]

Because you care what the answer might be or are looking for a solution to a problem. If you don't and you're not you're it just smacks of pot stirring. We don't really need that.

You asked what the big deal is about the motors then later say you don't care if they blow up so.............I don't know. Seems like waist of time. Maybe it's just me.

I went back to the start to see if I could find the point. I think the point was "don't scoff" at high rpm setups unless you can provide indisputable documentation that the motors will spontaneously combust. haha Put up or shut up kind of thing.

Isn't there an emoticon for a dead horse being beaten? Maybe a sticka fork in it emoticon.

No I think if you read it you'll see I wanted to know the ultimate consequence from running a high rpm setup. Not stirring the pit here sir but with all due respect I get the vibe you might be. I stated if mainly I had to worry about is a motor letting go, then I wasn't too much worried about it. If it's an esc...which could cause a fire, I'd me more concerned with the matter. Was a genuine question and a valid thread I created. It's veered way off course now now which disappoints me. Not sure why you are trying to battle me at this point. I didn't create this to start a stink, that's not what I'm about.

[Rumdog]

what do you think happens when a motor lets go? Good chance the esc does too.

[T.S.Davis]

My whole point is I'm tired of the scoffing, comments and negative things being said about running this rpm range.

I don't think there was any scoffing in the thread. Just really felt like you wanted the naysayers to provide some proof or stop posting anything to the contrary.

Seems like there was a good exchange of ideas. A few examples of motor failures which do seem rare. Some insight as to why some feel it's not the best option.

[Flying Scotsman]

I loved this thread lots of good info and bantering of different ideals..... I am old school (low rpm) and love my money....I still putter around in sport mode but I do admire those that push the envelope. It is very interesting to see how FE boating has evolved from nimh batteries, brushed motors, dubious esc's, pretty crappy ready to run boats, to what it is today! though I miss fussing around my motor lathe.

Douggie

[madmikepags]

fast........faster...........fastest!!!!!!!!! Action Jackson I tihink??? Detroit guy too no?

[T.S.Davis]

Dougie, did you ever try to up the timing one of the Graupner Neo motors to get just a few more rpm out of them? Before there was an LSH class. Those were the days. Nimh and a sparking armature inside a sealed boat. Good plan geniuses.

OH MAN. Matched cells at 12 bucks a crack. 32 cell packs and you over heated one cell with the hammerhead trying to end to end solder them. Wrecked.

We should start a new thread to toss around crazy stuff we did back in the day. Do'n it in a minute.

[kfxguy]

My whole point is I'm tired of the scoffing, comments and negative things being said about running this rpm range.

I don't think there was any scoffing in the thread. Just really felt like you wanted the naysayers to provide some proof or stop posting anything to the contrary.

Seems like there was a good exchange of ideas. A few examples of motor failures which do seem rare. Some insight as to why some feel it's not the best option.

I won't argue that. I am tired of the naysayers and negative comments as are alot of other people. Yes it was in fact a little aimed at stopping all of that too. But also I wanted more information. More information as to why not. Also, maybe I wanted all the negativity to stop. What's wrong with that? Wasn't meant to start arguments for sure tho.

[Ralf]

There is no problem with high rpm. There is a problem viewing it as a parameter standalone.
RPm is necessary for what? Right, Speed with a desired prop.

So it begins with the prop, and not rpm. And this is dependent if you speak about single or twin drive.

You want to push e.g. a 10kg 44"-Boat single driven with 50k rpm to 100mph, you can use your desired X447.
I think everybody knows what the effect is.
You can push a Twin 10kg 44"-Boat with ease with X447s, since they have blade surface like one 65mm Prop.

There is a prop range a boat is working (dependend of its shape/type, weight, number of drives, and its "job" like SAW, Oval etc.).
The next thing to think about how fast it should go, this will lead you to rpm.

Is it able to go that fast and how much current you need is another story.

ANother real critical issue: significantly reduced prop choices. The higher the rpm the more critical gets every mm pitch. Even different shaping of the props can be more dangerous.
Sure, light running boat types reduce the risks. But there is a whole picture :)


Ralf

[Doug Smock]

Wow you guys have been busy in here today!

Travis I haven't seen any arguments in this thread really. ( Not by the old standards right guys??) LOL

I think anyone reading this will have a clear understanding of everyone's view on the subject. Nothing wrong with that!