10 replies to this topic

[Cheater]

This happened almost a year ago, but I don't think the video has been posted here before.



I know Brad and he's the real deal, folks.

[Cheater]

Wanted to share an exchange from Facebook, simply because I can recall my asking the same question when I first saw G7 qualifying at a wing car event years ago.
 
Q: Why only one lap? It seems the more laps the quicker the times would go.

A: To get this kind of lap, every factor has to be optimized and the process of making that one lap negatively changes things sufficiently that subsequent laps are almost always slower. Heat in the motor, condition of the tires, wear on the guide flag braid, etc., etc.

[zipper]

The motors seldom last more than one lap, arms do have giant advance, total about 35-40 degrees. And the same with the qualifying tires. So we are turning to spray glue and race power when qualifying, it adds over 2/10 to the qualifying times. Except WC, EC, and Czech Nats still qualify with glue. But for how long?

[Steve Okeefe]

This is like double-A fuel drag racing (AA/FD), with turns...

 

One pass is all you get.

 

Congratulations (albeit late) to Brad Friesner!

[MSwiss]

condition of the tires.

The last World Record I set, tires were the issue, not the motor.

 

It was in 2001.

 

The current WR was something like 1.657, by the late George Teman.

 

At the Nat's, at Port Jeff, in the Warm-up on Tuesday or Wednesday, I ran one lap, and went something  like 1.661.

 

I decided to pull it and save it for the real Sunday race.

 

It paid off, as I set the record at 1.631, edging out Carlos Aloise.

 

I did it on my first lap of the 1st round.

 

I tried another lap or 2 , but the tires had gone away.

 

The point is I did it with the same motor, not reconditioned, and ran 3 or 4 laps total, that week, without it slowing.

 

The issue was the tires we used at the time were the old Riggen orange rubber.

 

The surface would get mottled after one , or 2 laps, tops.

 

That motor was a dream to qualify.

 

While a lot of guys were still using .459, 53's, this motor was a .480" dia. 64, with a plus 7 or 8 degree endbell.

 

It wasn't a real high amp draw motor, so it didn't arc braid, taking off, and the comm stayed pretty cool, even with a 38 spur.

[Pappy]

A friend of mine keeps asking me questions about the motors. How many RPM's are these motors turning and how are they geared? How many magnets and what kind? Who makes the motors and how much do they cost?

[Rob Voska]

Kinda funny........ it this about "racing" slot cars or seeing how fast someone can go for 1 lap? 

Reason I ask is they are VERY different things.

[Tim Wilkins]

Both.  It's about Racing as fast as you can for one lap.  Wing cars have special features for qualifying not built to last a whole race ....maybe 25-40 laps tops.  Even in Retro racing, you will rarely see a top lap time within a race match the qualifying times.  The difference being, what you qualify with in Retro racing is what you enter in the race.

[MSwiss]

A friend of mine keeps asking me questions about the motors. How many RPM's are these motors turning and how are they geared? How many magnets and what kind? Who makes the motors and how much do they cost?

Approx. ave RPM in Brad's lap 171,500.
 
He averaged 81+ mph, so it's reasonable to assume his car hit 100 mph (I remember a guy hitting 90 on the radar gun on a 2.1 second lap, back in 1992.
 
At 100 mph, approx. 208,700 RPM.
 
20-30 mags is common.
 
Here's a pretty standard RTR G7 motor, from Koford(probably the only one a raceway can purchase through a distributor;
M196-20-G7
20 mag CNC open motor with billet retainer
ball bearings and .490 84 SAW arm.
$438.86 ea.
 
I'm guessing one from someone like Beuford, might be $500.

[Pappy]

Thanks Mike.

 

I heard a few years back that they turned 180,000 rpm's but didn't know for sure. 208,000 rpm's is uncanny and almost sounds impossible. But then again, light traveling 186,000 miles per second sounds impossible to too but it does.

 

I don't know what keeps the motor and the tires together. 

[zipper]

I suppose a free spin might be about 300,000 rpm before the comms blow. Never tried more than 10V - on 70's I tested with 12V battery charger if the arm was good. Those were the asbestos Kirkwoods, pretty good. Some weren't...