wire drives for 12 and 21 riggers

[RIGGERMORTISE]

I have been thinking :blink: why not try a wire drive system on a 21 or 12 FF hydro. How mutch power can this sort of electric boat (thats hard to say i prefer nitro smell to the smell of hot batteries) drive line be considered for engines like the nova rossi 21 with a carbon pipe and 60% nitro.

How mutch power can these electric motors put out???? I have seen an article in the boat mags on wire drives but has anyone tried it on glow engines?

Any ideas?

Dave

 

[Preston_Hall]

I think it was Gerathy that posted some results from testing different dia cables, lubes, and teflon lined stuffing tubes.

The test was using an electric motor to turn each sytem at a given rpm. The current was then measured and converted to HP for each. As I remember, there were no mentionable gains or losses.

I know this isn't wire but you might be able to do the same test to see. Or just assume that there might not be any gain.

 

[Don Ferrette]

I think it was Gerathy that posted some results from testing different dia cables, lubes, and teflon lined stuffing tubes.
The test was using an electric motor to turn each sytem at a given rpm. The current was then measured and converted to HP for each. As I remember, there were no mentionable gains or losses.

I know this isn't wire but you might be able to do the same test to see. Or just assume that there might not be any gain.

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Yup, it was Rod, he tested a bunch of things including cables. One of the more interesting outcomes was a 1/4" drive shaft has no more drag than a 3/16" & that an "S" bend stuffing tube has way less drag than straight or soft curved tubes. :blink:

 

[Pennywizz6]

Electric motors actually have much more low end torque than nitro engines. Comparibly ya know. Like for say if your firmilliar with rc trucks, the E-maxx and a T-maxx in a tug-o-war. The low end punch of the electric motors would dominate the T-maxx, granted its two motors vs one. But once you start going at a higher rpm, the torque is much higher in a nitro.

Phil <_< :blink: B)

 

[Saugling]

Yup, it was Rod, he tested a bunch of things including cables. One of the more interesting outcomes was a 1/4" drive shaft has no more drag than a 3/16" & that an "S" bend stuffing tube has way less drag than straight or soft curved tubes.  :blink:

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I always thought it is the other way round :blink: :unsure:

....so maybe I should starts s-bending my tubes in the future :huh:

 

[Don Ferrette]

Yup, it was Rod, he tested a bunch of things including cables. One of the more interesting outcomes was a 1/4" drive shaft has no more drag than a 3/16" & that an "S" bend stuffing tube has way less drag than straight or soft curved tubes.  :blink:

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I always thought it is the other way round :blink: :unsure:

....so maybe I should starts s-bending my tubes in the future :huh:

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The "S" bend controls cable whip better.

 

[RIGGERMORTISE]

So has anyone tried a wire drive system with a good 21 engine or has it only been used with electric boats??????

I want to try it on my 21 rigger and Nova Rossi and dont want to waste my time if someone has already tried it.

Thanks

Dave

 

[Paul Pachmayer]

Hello guys,

Well, I have limited experience with wire drives but here ya go. The wire drive is more efficient no doubt but IMHO it wasn't worth fussing around with alignment issues and on the water there's too many other things going on to justify the hassle. I've also seen several wire drives break this year. Keep in mind this is from a FE point of view.

Now in a nitro boat I belive there is a problem with wire drives because of the way a combustion engine works. The wire drive don't stand up well to the shock a nitro motor transmits to the wire. In an electric boat the power comes on very smooth and linear. I can't recall all the specifics of wire drives and nitro but the general idea was not to do it.

Paul.

 

[Paul Pachmayer]

Hey Dave,

How mutch power can these electric motors put out????

Enough to hold the record for the fastest RC boats on the water.

Paul.

 

[Ian Inverarity]

Paul,

While you are obviously correct in saying the electric boat had enough power, I was involved in a discussion on Intlwaters just after that record, and my understanding was the power level used was less than the output of the big nitro motors! The key seemed to me to be the 48-50000 rpm!!! :blink:

Ian

 

[Paul Pachmayer]

Hello Ian,

I can't say what a big nitro motor makes HP wise but I have one of the motors used to set that record and it's good for about 4 HP. It also weighs 2 pounds, lol. And your right, it's all about RPM but you need the stones to turn the right prop as well. We'll see what happens next month, I'm going to the SAWs and I have a feeling the old record is going to fall.

Paul.