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Mike Morrissey GP replica


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#26 Pablo

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Posted 08 October 2015 - 03:17 PM

Second "rough cut" on the rears:

 

IMG_7080.JPG


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Paul Wolcott




#27 Pablo

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Posted 09 October 2015 - 01:47 AM

As of today, I'm going to "QA" my main rail rods/wires.

 

IMG_7082.JPG

 

Out of a "three-pack", two needed about 1.5" of bad spots removed from the centers, and one was unusable for rails IMO.

 

IMG_7083.JPG


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Paul Wolcott

#28 dc-65x

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Posted 09 October 2015 - 12:28 PM

Holy smokes, Pablo. Checking for straightness on the main rails with a dial indicator. :shok: You've got me beat there! :crazy:  I thought I was being fancy rolling the rails on a flat to check for straightness. :laugh2:
 

Bent mail rails do suck...

 

Onward, Pablo...  :good:


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#29 SlotStox#53

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Posted 09 October 2015 - 01:14 PM

Just the old eyechrometer for me.  :laugh2:

Wheels and tires looking good, sir.  :)

#30 Pablo

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Posted 09 October 2015 - 02:46 PM

Thanks, guys.  :)

 

Getting off to a slow start; last week I was sick, now I'm struggling with planning phase details I should have worked out weeks ago. :dash2:

I now realize the magazine article doesn't address three big issues: wheelbase, guide lead, and if the rails are tapered towards the front or not.

And I thought I had the perfect steel washers for the axle tubes, and didn't.

 

Nothing is ever easy at The Wolcott Ranch, so I'm used to it.  :laugh2: One good thing, I found the "secret drawer" at Lowe's stashed with K&S stuff.  :dance3:

 

Thanks to some help from my good friends, I may actually solder something here soon.


Paul Wolcott

#31 Pablo

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Posted 09 October 2015 - 07:11 PM

Found steel washers, perfect ID (slightly bigger than the axle) but OD was a little bigger than I wanted (.310"). So I turned 'em down a little, to about .265". I'll polish them after they are soldered to the tube pieces.

 

IMG_7111.JPG

 

Genuine Russkit 495 bracket

- modified to accept inside rails

- axle tubing holes hogged out to 7/32" with a Uni-Bit

- motor bushing and mounting holes slightly enlarged and countersunk

- flattened, straightened, and sanded clean

My flag blueprinting mini-jig is a nice tool for this.

 

IMG_7134.JPG

 

Motor bracket is ready.

 

IMG_7121.JPG


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#32 Bill from NH

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Posted 09 October 2015 - 08:28 PM

Wheelbase and guide lengths are usually dictated by the body used. I haven't had the body you plan to use, so I'd say measure it twice, cut once.

 

If I was building a generic 1/24 F1 chassis, i'd use a 4.25" wheelbase and a .75" guide lead. These dimensions would fit the majority of the 1/24 cigar-shaped F1 bodies.

 

Nope, this Team Russkit car doesn't use tapered rails. Construction photos and the Martin Windmill cars will back this up. :)


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#33 Pablo

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Posted 09 October 2015 - 09:03 PM

Wheelbase and guide lead lengths are usually dictated by the body used.

 
Ouch. My ears are burning so bad I had to run get some ice.  :laugh2:
 
Thanks, Bill, for the confirmation of "no taper" on the rails.  :good:
Paul Wolcott

#34 Hworth08

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Posted 10 October 2015 - 09:09 AM

The open wheel cars back then, as today, were a handful to race but a ton of fun. A 4.5 inch wheelbase and as long a guide as the body allowed made them easier to race.

 

Car Model rules may have been strict enough to keep the wheelbase close to the original. Otherwise Bill is close to correct.


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#35 Pablo

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Posted 10 October 2015 - 09:25 AM

The orange wheels are slightly wider than the blacks, so I planned tube lengths for them at 3.00".

 

Twin Slick 7 20 thou steel spacers on each side to allow a needle oiler to lube the washer faces.

 

The black wheels will use an .063" against the hubs and a single Slick 7 against the washers for 3.00".

 

By adding an extra .063" spacer on both sides to either setup, the width will be about 3-1/8" or 79.4 mm.

 

Just to triple-check my math, I mocked it all up.

 

IMG_7137.JPG

 

IMG_7139.JPG


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#36 Asp

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Posted 10 October 2015 - 09:46 AM

The wheelbase of the real Honda was 2390 mm, which will give a scale wheelbase of around 4.00"... too short maybe for good handling.


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#37 Pablo

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Posted 10 October 2015 - 09:59 AM

Noose measured the body today; wheelbase will be 4.00" and guide lead 5/8".


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#38 Asp

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Posted 10 October 2015 - 10:17 AM

Close to scale wheelbase then... very good.


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#39 Don Weaver

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Posted 10 October 2015 - 10:38 AM

Whoo! That be short. 

 

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#40 Cheater

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Posted 10 October 2015 - 10:50 AM

Pablo,

 

Since the rear tire diameter of the car is known, use the cover photo to calculate the wheelbase of the car shown there, just as a double-check. Or use a pic from the article.


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Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#41 Pablo

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Posted 10 October 2015 - 11:09 AM

Wheels complete at .880" OD and 1/2" tread on track.

 

One SBR tire has a small bubble on the sidewall, an imperfection in the donut.

No big deal, so I left it alone.

 

IMG_7140.JPG


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#42 Pablo

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Posted 10 October 2015 - 05:22 PM

Washer ends pre-polished with 2000 sandpaper
 
IMG_7149.JPG
 
.300" tube pieces go through the bracket sides and up against the bushing flanges.
When I torched the bracket/bushing/tube joints (both at the same time) the acid and solder wicked out into the washer/tubing ends.
Good thing I had them secured and in perfect position at the time :sun_bespectacled: (Thanks, dc-65x.  :wink2: )
I added a little more solder to them for aesthetics.
 
IMG_7173.JPG
 
Care must be taken to ensure the washers don't end up touching the axle and rob horsepower
 
IMG_7180.JPG
 
I'd like to thank a lot of people for helping me get this car started, dc-65x, Tony P, Bill from NH, John Havlicek, and especially Noose.

If I forgot anybody, get in line behind Noose for an opportunity to throttle me - I've been driving him crazy with questions and favors for two days now. :laugh2:


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Paul Wolcott

#43 Cheater

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Posted 10 October 2015 - 05:26 PM

I know just how Noose feels, since you used to do the same thing to me... LOL!

Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#44 Bill from NH

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Posted 10 October 2015 - 05:53 PM

You're closer to him than the rest of us are. You might not be off the hook yet. :laugh2:


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#45 Cheater

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Posted 10 October 2015 - 06:02 PM

BTW, Pablo, is that all you got done today? LOL...


Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#46 Pablo

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Posted 10 October 2015 - 06:29 PM

Correct, sir.  :laugh2:


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#47 endbelldrive

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Posted 11 October 2015 - 04:14 AM

Lookin' good, Paul. Setting up the inline bracket and bushings used to take me a long time for some reason. I think it might of been one of those goofy zen warm-up things or it could be I was making it up as I went along and didn't have the design figured out. Probably the latter.  :scratch_one-s_head:
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#48 Pablo

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Posted 11 October 2015 - 02:02 PM

Thanks, Bob. "Goofy Zen warm-up" made my ears tickle. :laugh2:

All "jiggyed up", but I decided to wait for the body before soldering the rails.
 
Meantime, lots of prep work to do.
- inside of front axle tube polished with 2,000 grit wet/dry
- first rail bent at 90-1/2 degrees (vice 90) to allow for downward tilt of bracket
- bracket bracing wires pre-tinned to prevent oxidation
 
IMG_7190.JPG
 
I discovered a neat new trick. When spinning tubing in a drill to finish the ends, direction of rotation doesn't matter.
 
IMG_7194.JPG
 
By using it in reverse, the chuck doesn't continually lose its grip.
The downside is, at some point I will forget it's in reverse and try to drill something.  :dash2:
Won't be the first time...
 
Hey, Cheater, you want me to build up that sweet jig motor for you when I get done with it?
It only got hot a couple times. I could have it done by later tonight...? :sarcastic_hand: :roflmao:
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Paul Wolcott

#49 Pablo

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Posted 12 October 2015 - 03:25 PM

All chassis parts prep complete.
 
IMG_7224.JPG
 
Weight was polished by set-screwing it to a piece of tube, spinning it with the drill, and hitting it with 2000 grit.

Then I polished the bore with a spinning 1/8" axle wrapped with the 2K grit. :D

IMG_7202.JPG
 
Funky said, "That's overkill", but I had fun doing it. :sun_bespectacled:
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#50 Cheater

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Posted 12 October 2015 - 04:32 PM

If you are having fun, that's all that matters.

As Rick always says, "Onward!"

Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap






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