100+ MPH

[John Finch]

When Andy did 126 mph he didn't go deep on the pond at Elizabeth city. His boat got up real quick. I would guess he will be at the 150 mark sooner or later on any of the ponds are using right now.

 

[AndyBrown]

Yes John! I think that's where Nitro will have a distinct advantage in the future.

Unless the pound per watt comes down, the electrics will soon run out of accelleration distance.

In R/C drag racing the electrics and nitros are pretty evenly matched in the extreme class were it's "run what ya brung", and the drag guys are relatively new to nitro so they're still in a learning curve.

I've yet to hear about an electric coming out of the corner @ 98

To prove my point, the IMPBA electric Oval records are 37% slower in the mono class and 45% slower in the Hydro class. B)

 

[jayt]

What's the nitro speed "out the back door" on the traps on a 120 mph pass? Surely someone has a radar speed of that...

Regardless, it is fun to have a legitimate rivalry between nitro, gas and electric. But who among the liquid-fuel guys would have thought that was even possible four years ago? Electric chemistry is changing constantly, while nitro is the same as it was forty years ago...only the oil quality has changed, and all the power any boat carries is in the fuel on board.

To clarify, I was standing on the driver's stand 8 feet above the water for the last pass: Joerg's average speed record was 123 for two passes made earlier in the day. Just before dark he put on a different prop and made a single pass through the traps which tripped at 133 mph. A police cruiser at the end of the lake got him at 143 just before he hit the bank about 75 feet past the last light. His angle through the traps was bad, that's why he hit the bank...it was almost dark, he waited too long to make his attempt.

 

[Tim_Duggan]

To clarify, I was standing on the driver's stand 8 feet above the water for the last pass: Joerg's average speed record was 123 for two passes made earlier in the day.  Just before dark he put on a different prop and made a single pass through the traps which tripped at 133 mph.  A police cruiser at the end of the lake got him at 143 just before he hit the bank about 75 feet past the last light.  His angle through the traps was bad, that's why he hit the bank...it was almost dark, he waited too long to make his attempt.

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Jay,

You wouldn't happen to know how heavy Joerg's boat was RTR by any chance?

Unless the pound per watt comes down, the electrics will soon run out of accelleration distance.

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Andy,

How heavy was the 120+ mph boat? Seems I didn't kill all of my brain cells after all and they are curious!

Tim.

 

[AndyBrown]

Well let's look at it this way. Batteries are getting better and the motor to use that stored energy is getting better.

Nitro will always be the same, but the engines to use that energy will get better.

So then, what is the pontential energy in a pound of current technology batteries compared to a pound of nitro? And more importantly how quickly and effieciantly can the motor and IC engine use this potential energy?

 

[jayt]

I don't know the exact weight of Joerg's boat but I'd estimate it to be between 7.5 and 8 lbs. Part of the disparity between nitro/gas and electric is the way the motors work, regardless of the total energy of the fuel carried. Electric motors make large amounts of torque right off the beach and build horsepower as the rpm increases. They can easily carry relatively large props off the beach, and can spin them to an unknown upper rpm limit.

Liquid fuel motors sacrifice low end torque to gain on the top end; this limits the size of the prop they can carry since they have to be able to accelerate it from low launch speeds. If we could launch these boats at 60 mph they could carry larger props and higher top speeds would be much easier to attain. Simple physics also limits their top rpm.

The new LiPo cells everyone talks about are interesting, but they do not carry the huge advantages some seem to believe. To be able to put out the watts required for SAW records they must be configured so that they have a minor weight advantage over the current NiMH cells. Perhaps they will save 8-10 ounces over a 32 cell pack - that's just an 8%-10% reduction in boat weight, hardly a huge step change. But what else is on the horizon....?

 

[Jeff Lutz]

I don't know the exact weight of Joerg's boat but I'd estimate it to be between 7.5 and 8 lbs.  Part of the disparity between nitro/gas and electric is the way the motors work, regardless of the total energy of the fuel carried.  Electric motors make large amounts of torque right off the beach and build horsepower as the rpm increases.  They can easily carry relatively large props off the beach, and can spin them to an unknown upper rpm limit.
Liquid fuel motors sacrifice low end torque to gain on the top end; this limits the size of the prop they can carry since they have to be able to accelerate it from low launch speeds.  If we could launch these boats at 60 mph they could carry larger props and higher top speeds would be much easier to attain.  Simple physics also limits their top rpm.

The new LiPo cells everyone talks about are interesting, but they do not carry the huge advantages some seem to believe.  To be able to put out the watts required for SAW records they must be configured so that they have a minor weight advantage over the current NiMH cells.  Perhaps they will save 8-10 ounces over a 32 cell pack - that's just an 8%-10% reduction in boat weight, hardly a huge step change.  But what else is on the horizon....?

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All of this talk about electric, and little does anybody seem to realize, (except Andy), that you could design a nitro engine to run 200 mph! We just need a market for it, the engine would not be able to run in a twin,due to exceeding 30cc , that puts the market down to single engine F class boats. I do think a better bigger engine will be produced, and when it is, the electric boaters will be fanning there butts with both hands! ( OH! AND PRAYING TO THE EAST!) JEFF LUTZ

 

[Buckshot]

Hey Jeff,

Do you know something about someone developing a bigger, better Nitro motor? h34r:

MAC 100 please!!!!

That would be something to see!!

Just wishful thinking on my part but that would be pretty awsome

-BUCK-

 

[Norm Doerr]

Hey Jeff,  Do you know something about someone developing a bigger, better Nitro motor? h34r:

MAC 100 please!!!!

That would be something to see!!

Just wishful thinking on my part but that would be pretty awsome   

-BUCK-

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MAC 90. Just like the Ruskie but better.

 

[Buckshot]

Norm,

Is that something that CMDi has in the works?

Curious minds want to know.

Mr. Brown- Whacha got cookin' down there in FL?

-BUCK-