32" hotr 90+mph

[TotalPackage]

It get shorter. The lay of the cable is supposed to wind up not unravel. Wires eliminate this but fastening them is an issue all in itself

[davey]

cool...I thought it gets shorter....thanx

[TotalPackage]

cool...I thought it gets shorter....thanx

always leave at least a 3/16 inch gap between the drive dog and the strut.

[Jeff Wohlt]

I braze my high power cables. For wires i have two methods...the hp versions wont let go at the stub. 078 can run 120 mph..we already know that.

[TotalPackage]

Ok thats good to know. Howard If jeffs wires are good for 120 mph they might be worth a try the only thing that would worry me is the id of your stuffing box. It will be an improvement over flex cable but will it have as much impact as a finely tuned prop? I doubt it; but all that helps cannot hurt.

[Howard Lee]

If your flex is too small it will break much easier. I too would advise using a larger flex, but not because you end up with more power. Thats a bit backwards. I understand your thinking on this matter, that the flex absorbs power, but the flex doesnt have an outlet for that energy aside from shortening length or expanding diameter. If the flex absorbs too much energy, it will break. If you were to measure power at the prop, you would have more with a smaller diameter flex, if it didnt fail. We run across this all the time on our chassis dyno. A car with smaller/lighter tires, wheels, axles, ect. will net more horsepower at the wheels. Any time you add rotating mass you lose horsepower in turning it.

Im with you on using larger flexs, just not to increase power.

Your right about a car my 07 corvette has 400hp at the wheels and maybe 480 at the motor, lighter is better. Its much different when using a flex shaft, there are bends and flexing to think about. Take a power drill and put a flex shaft extension and try to break a small bolt loose but now go from 10" to 20". The longer the shaft the more power it will take. With something that has flex its always better to go bigger and its much different then a car. I wish we had a dyno to check small motors. I work with power tools all day so i know what happens with extending a shaft. Maybe its different but i don't think so.

[keithbradley]

Your right about a car my 07 corvette has 400hp at the wheels and maybe 480 at the motor, lighter is better. Its much different when using a flex shaft, there are bends and flexing to think about. Take a power drill and put a flex shaft extension and try to break a small bolt loose but now go from 10" to 20". The longer the shaft the more power it will take. With something that has flex its always better to go bigger and its much different then a car. I wish we had a dyno to check small motors. I work with power tools all day so i know what happens with extending a shaft. Maybe its different but i don't think so.

I work with power tools all day as well
In regards to breaking a bolt loose, I can think of a thousand examples that would prove your point (first one that comes to my mind is adding an extension to an impact and lessening its effects). A flex will dampen impact over no flex at all, but we arent breaking bolts loose.

Think of it this way Howard: A flex will "flex" a certain amount and shorten under power. It does absorb some energy to do that, but it will only flex so much, and then it breaks. It will flex all the way to that shortened length, and then all power is transmitted to the prop, until enough power is made to shorten the flex past that point, in which it breaks. It doesn't have the capability to continue absorbing more and more power, that power has to go somewhere...I hope this makes sense...
Your argument still holds water to some degree, because the smaller flex will have a lower power threshold before it breaks.

And as far as short versus long, I agree. A shorter flex will trasmit power more efficeintly in the same configuration (both cables straight). That can change when a shorter cable has a higher degree of bend though as power can be lost in the form of a side load.

So you either have a modded 07' Vette or a ZO6 by those numbers...NICE!
Truly awesome cars

[Jeff Wohlt]

A flex is a noodle and will only try and wind up so it is always making lots of contact with the stuffing tube...which creates resistance. Wire does not do this.

[6sHyper]

I work with power tools all day as well
In regards to breaking a bolt loose, I can think of a thousand examples that would prove your point (first one that comes to my mind is adding an extension to an impact and lessening its effects). A flex will dampen impact over no flex at all, but we arent breaking bolts loose.

Think of it this way Howard: A flex will "flex" a certain amount and shorten under power. It does absorb some energy to do that, but it will only flex so much, and then it breaks. It will flex all the way to that shortened length, and then all power is transmitted to the prop, until enough power is made to shorten the flex past that point, in which it breaks. It doesn't have the capability to continue absorbing more and more power, that power has to go somewhere...I hope this makes sense...
Your argument still holds water to some degree, because the smaller flex will have a lower power threshold before it breaks.

And as far as short versus long, I agree. A shorter flex will trasmit power more efficeintly in the same configuration (both cables straight). That can change when a shorter cable has a higher degree of bend though as power can be lost in the form of a side load.

So you either have a modded 07' Vette or a ZO6 by those numbers...NICE!
Truly awesome cars

pretty sure those are stock numbers on a C6 actually and a z06 is like 500hp.

[FighterCat57]

A flex is a noodle and will only try and wind up so it is always making lots of contact with the stuffing tube...which creates resistance. Wire does not do this.

Jeff, you think the wire could handle that kind of bend and rpm? I've spun one up to 45k rpm, but not any higher. They last quite a while, but eventually every one I've used breaks right in the middle of the bend.



Back to the motor; Howard, any thoughts on using a 1520/1600kv? It's stamped right on it... 60,000RPM.

I have one here, I'm getting ready to mount in a stock Genesis hull and see what happens on 10s.

[tiqueman]

Jeff, you think the wire could handle that kind of bend and rpm? I've spun one up to 45k rpm, but not any higher. They last quite a while, but eventually every one I've used breaks right in the middle of the bend.



Back to the motor; Howard, any thoughts on using a 1520/1600kv? It's stamped right on it... 60,000RPM.

I have one here, I'm getting ready to mount in a stock Genesis hull and see what happens on 10s.

If I remember corectly, Castle recommended not more than 40K in marine applications while they had this motor for sale.

[TotalPackage]

Your right about a car my 07 corvette has 400hp at the wheels and maybe 480 at the motor, lighter is better. Its much different when using a flex shaft, there are bends and flexing to think about. Take a power drill and put a flex shaft extension and try to break a small bolt loose but now go from 10" to 20". The longer the shaft the more power it will take. With something that has flex its always better to go bigger and its much different then a car. I wish we had a dyno to check small motors. I work with power tools all day so i know what happens with extending a shaft. Maybe its different but i don't think so.

you can make a dyno using another motor

[keithbradley]

pretty sure those are stock numbers on a C6 actually and a z06 is like 500hp.

Nope. Depends on the dyno, but they usually come in around 330 whp on ours. The Z06 would be over 400 whp though. Big difference between crankchaft hp and wheel hp! Manual vs auto makes a slight difference too, as does STD vs SAE HP.

[Jeff Wohlt]

I'm sure it can but you have to keep an eye on them. One reason I still like teflon in some wire set ups.

Yes, the slighter the bend the longer it will last but would be good for some time.

[FighterCat57]

I'm sure it can but you have to keep an eye on them. One reason I still like teflon in some wire set ups.

Yes, the slighter the bend the longer it will last but would be good for some time.

Cool. Think I'll try it. 10s 1520/1600 078 wire.