65 replies to this topic

[Pablo]

Finished June 2010:

 

 

Here's where it all started:

A gift to Steve Harrington, owner of Raceworld Speedway in LaGrange, GA.
Body: JK 4" Legend Chevy Coupe.
Paint: Chad Herrington. It will be # 101, in memory of a family legend racer.
Motor: 36 D. I may rewind an old one, or I may use a NOS Royal Bobcat.
Chassis: Dynamic sidewinder.

[Hworth08]

Would number 101 happen to be Bill Morton. Bill raced several years at the Fairgrounds in Nashville using 101 under permission of NASCAR as the car was numbered for the 101st Air Bourne out of Fort Campbell who Bill was a member of.

[Pablo]

As soon as he gets out of the tumbler, I'll ask him
Seriously, I'll find out, Don

[Pablo]

Don, here is Steve's response:

"The driver of the 101 car was my brother, Neal Harrington. All I can remember is that this number was driven by a local racer when we were growing up and Neal liked his style of driving and used this number when he started driving local tracks."
Steve R. Harrington
Raceworld Speedway

The 101 is still in the planning/parts gathering phase......if the Dynamic parts don't please me, I may just go wild and scratchbuild the beast....we will see......here is a progress report:

[Prof. Fate]

Hi

My only worry about the parts is that of the guide mount. If it is one of the replicas someone did about 20 years ago, the car will be undriveable. It will need a lot of weight on the tongue. I think mine run about 20gms. Do you have any of the screw mount fitted weights for this?

Fate

[Pablo]

I have a giant brass weight for it, I'm too lazy to weigh it, but it measures .5" OD by .340" tall will that work, Rocky ?

[Pablo]

Help, Rocky !!!!!

Planning / Parts Gathering Phase: 42 T / 48 P spur is level with bottom of motor mount, but 12 T pinion is too small to meet the spur.

I'm thinking a bigger pinion may work. This is where I need a little help from my good friends

If a 16 T pinion fits, will a 2.6 ratio work ? The rear wheels will be approx. 1" OD

[TSR]

And this is how Roy Moody figured out the angle-winder...

[Pablo]

Funny, but oh so true
Thanks Doc

[Duffy]

I'm brand new to all this & may be too ignorant by half, but I've been collecting hardware for Vintage sidewinders and the gearing's all 40p which gives you much larger pitch diameters. I suspect this accounts for the extra distance you're seeing in your paste-up shot; I know I didn't have that trouble the other day when I was sizing up a project on the same Dynamic chassis.

I'm short on pinions, but if you got a target ratio I may have a spur for you. PM if y'need.

Duffy

[Kim Lander]

Pablo,
I have some old side winder stuff I will bring with me Memorial Day weekend, maybe you can use some of it maybe not, did you get a 36D for it yet?...seeya in Thomasville....Kim

[mdiv]

I'll add my very meager assistance, as I've been doing nothing but Dynamic for about 2 years now, lol

Start with a 16T pinion, then change up the spur as needed, you may need to go to a 46 spur.

Any reason not to go inline?

- Mikey

[Duffy]

Any reason not to go inline?

(1) Because the bracket's right there ready to go
(2) Because sidewinders are Cooooooool
(3) Because inlines are for skinny things like Vanwalls

Well, them's my reasons.
Duffy

[Horsepower]

Duffy-Those were all 48 pitch. I don't ever remember a 40p gear. I think a 46-47-48 tooth 48 pitch may be in order here Paul, and I remember some of the factory RTRs were set up with 2.6 to 1 for this very reason. Paul, I have a few larger pinion sizes here somewhere up to and including 22 teeth and also some larger Cox spur gears.What type or brand of spur gear is that? It looks like an aluminum anodized (but can't think of the brand name). The bad thing about going with the high 2.6 ratio is, as I'm sure you know, you'll need a track the size of Texas to wind out the motor. Still, if you had a rewound (for torque) 36D motor like the 707 it just might be OK. PM me if parts are needed!

[Pablo]

I may have a spur for you.

Thanks Duffy, I may take you up on that.

I have some old side winder stuff I will bring with me Memorial Day weekend, maybe you can use some of it maybe not, did you get a 36D for it yet?...seeya in Thomasville....Kim

Thanks Kim, but my work schedule conflicts, I can't make it. See the 36D Royal Bobcat in the photo ?

Start with a 16T pinion, then change up the spur as needed, you may need to go to a 46 spur. Any reason not to go inline? - Mikey

That may well be the answer. As far as inline, what Duffy said, plus I think a 36D inline would have some bad gyroscopic issues

I remember some of the factory RTRs were set up with 2.6 to 1 for this very reason

Thanks Gary, thats the answer I was looking for. It's looking like it will end up at about 2.6

Let me chew on this a little more before I decide. I really appreciate all the help

[Hworth08]

Just something to consider. The Cox 16 tooth brass pinion and 48 tooth ring gear made a pleasant sound that is much cherished among the Cox collectors. 3:1 gears with the required tall tires was a good ratio for the stock Mabuchi motors.

[Pablo]

Gary, or somebody who has one, please measure a 16 for me, if it's about .580 OD, I'd like one please

Gary, I don't know what brand these blue gears are.

[Prof. Fate]

Hi

A 48 tooth gear is an inch in diameter requiring a 1 1/6th tire minimum. We usually ran 1 1/8th because back then, the cars were teched before and after a race, and if there was a spark or noise, during the race.

I have 14s and 16s. And REH still has them as well.

Fate

[Duffy]

Okay, Gary, Paul, I declare am officially an idiot. Yes, all the spurs here are 48p.

I just did a cursory measurement over a 16/48 mesh and got ~.705" between centers, giving you 1/16" to spare in your mount on that bracket. --What's the pedigree of the brass spur in your earlier post? It looks a lot larger than the blue thing.

A 48 tooth gear is an inch in diameter requiring a 1 1/6th tire minimum.

I was under the impression that the 48 tooth gear was 1" pitch diameter--the 48T I'm holding here is 1.040" overall.

Duffy

[Horsepower]

I believe Paul's gear is an aluminum blue anodized by Spacific.

[Horsepower]

I was under the impression that the 48 tooth gear was 1" pitch diameter--the 48T I'm holding here is 1.040" overall.

Duffy

Oh, you machinists are SO precise! I am betting that all the spur gears we use may be off a few thousanths size wise, but close enough for government work!

[Pablo]

I just did a cursory measurement over a 16/48 mesh and got ~.705" between centers, giving you 1/16" to spare in your mount on that bracket. --What's the pedigree of the brass spur in your earlier post? It looks a lot larger than the blue thing.

Duffy, you are correct about the approx. shaft to axle measurement, it's about .680
The big brass spur you refer to is a 50 T, OD approx. 1.075

Gary is sending me a 16 pinion. We shall see.......

[Duffy]

Oh, you machinists are SO precise!

...Your POINT?...

Gary is sending me a 16 pinion. We shall see.......

--& I got a couple 47s here if you need, a flat solder-on & a Cox.

Duffy

[Pablo]

Send 'em

Lots of choices make me happy
Thanks Duffy Thanks Gary

[Horsepower]

...Your POINT?...

It's right after the 1! Didn't you see it? 1.040 uh-oh.....