32" hotr 90+mph

[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.

[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.

[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

[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.

[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.

[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]

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

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

[davey]

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

[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]

does the flex shaft get longer or shorter when running hard and should the shaft be a little shorter in the collet

[TotalPackage]

Huey cables are my pick.There are also some diy-ers that make them and they do a good job.Another member suggested you also watch for runout on your collet. That was excellent advice; something I though only the old schoolers where aware of.

[keithbradley]

I want to talk about drive shafts for the ones that don't know. The flex drive shaft is a hp killer. If you can keep from putting your motor to the front then do it, the shorter the shaft the better. Also the bigger the shaft the better. A small shaft is flexing and bending and the more hp the more this will happen. You will lose hp with a solid drive shaft but a flex shaft, forget about it. I would say anything over 2hp should have .187 or 5mm.

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.

[TotalPackage]

Just make sure when the set screw slips you get taken care of I didnt.
Totally forgot the sale but I still have my copy of the reciept.
Ive lost 2 props with the loctite method. If its high powered and you cant get a set screw on it id be wary of it.

A true pain in the :

[Jeff Wohlt]

You should try one of my wiredrives...i would make it special for your app

[TotalPackage]

I did try a v947 but just didn't really like it. I did 75 with it on my 1st pass and came in and moved the batteries back and got to 86. At 86 it went into a flip, just didn't work good with this cat. The best prop is a prather 230 but only got to 90, I tried a prather 235 but it hopped to much to get over 70. The props need a pro to work on them. ABC was the fastest props but it also needs work. I was thinking about getting this http://www.offshoreelectrics.com/pro...od=ros-pitch-g but i don't know how hard it is to use. This 32 is going into retirement and some of its parts will be on my new 32. My new 32 will have a neu 1527 1.5D, im looking to see what the max S i can run with it?

I want to talk about drive shafts for the ones that don't know. The flex drive shaft is a hp killer. If you can keep from putting your motor to the front then do it, the shorter the shaft the better. Also the bigger the shaft the better. A small shaft is flexing and bending and the more hp the more this will happen. You will lose hp with a solid drive shaft but a flex shaft, forget about it. I would say anything over 2hp should have .187 or 5mm.

Told you long ago my friend that that next level of speed would require a good prop guy. If you need an address to a great one let me know and you can get them hardened too!