Scx Crp11 - Tech Inspection

[356speedster]

The tech inspection is done, I just need to punch all the data into the spreadsheet and get it posted.

 

I've measured and recorded the following data:

• wheel RPM
  
• weight
  
• weight balance
  
• track width
  
• wheelbase
  
• guide lead
  
• SCX designation on the tire wall.
  

It's taken a bit longer than planned due to November being the busiest month at work, but the cars will be shipped out on Friday this week. There are a few cars that need some work, so I will focus on getting them done, but if I find enough spare time I will do a few timed laps, just to give an indication on how they behave on my track.

 

List of cars with problems that will be fixed:

(note that some cars have been re-numbered)

 

#7 Fiat 124 - Graham Lane: front axle needs spacers to avoid the front tires sticking too far out (more than 1mm).

 

#11 Toyota Celica - Ben M: Square tires (the car is jumping around like a kangaroo), looks like the tires have been attempted glued and the glue has loosened. I will clean up the wheels and tires and re-assemble without glue. If the tires are beyond repair I got spare tires available (SCX type-8 18.3x9.8 "Rally")

 

#32 Lancia Delta S4 - Antony: Tires are unrecognizable (no lettering on the tire walls), tires are glued to the rims and part of the contact path seem to have melted, so I suspect these tires may have been treated with something or reacted to undried glue during transport. I will true them and check the grip level against it's competitors. If I find it to have a big advantage/disadvantage I will replace the rear tires with a pair of new SCX type-8 18.3x9.8 "Rally" tires.

 

#50 Ford Escort MKII - Highlander: Front tires sticking almost 3mm outside the fenders on each side. I will take out the front axle, cut it down and re-install with new spacers so that it's within the 1 mm limit. The car also has a setup issue, it's riding on only 3 wheels, the front right wheel is about 2 mm above the ground. I will take a closer look to see if I can find anything that is binding or jammed somewhere inside the chassis.

 

#66 Ford RS200 - Kidvoltage: Front light lens is loose inside the car, will re-glue it.

 

Beside a few loose mirrors and antenna's I think this cover the cars that needs to be fixed before we start.

 

But there are quite a few cars that simply aren't smooth, a bit of extra running in the gears and tire truing could help many of these cars a lot. When running on "medium grip" stock tires a smooth car is essential to find the extra grip that will sort the winners from the mid-pack. Many of them will probably correct themselves with some wear and tear, but the points lost in the beginning of the series will be tough to get back. I also noted some burned oil smell while testing the RPM so there might be a few over oiled motor shafts, but time will tell if this will becomes a problem or not.

 

I've updated the gallery with pics of each car. I also got chassis underside pics that I need to get off my camera and into the gallery.

 

As usual my two kids (5 & 7) have chosen the best looking car, I will reveal the winner and the prize later

 

BTW: As the organizer of the event I will take the liberty to use my position to re-consider my own entries until Friday, got to have some privileges in this job :huh2:

 

 

Tore

Edited November 24, 2010 by 356speedster

[356speedster]

Here is the unofficial version of tech sheet (I need to verify a few numbers and re-check a few cars after fixing them).

 

Also take notice of your car numbers, since many of the cars have been re-numbered, and this is the number that will follow the car throughout the series.

 

 

If I have made any obvious mistakes like the motor type, etc... please correct me.

 

The Wheel RPM was measured at 12 Volt with a lazer tacho on the left rear wheel. The car was warmed up in 1 minute with the wheels in the air, then the measurement was taken during 10 seconds. The result was then rounded off from the average reading from that 10 second period. Some motors probably need to heat up more before max RPM is reached, but this gives an indication on the difference between the cars.

 

Differences in wheel RPM between similar motors might be due to friction in the running gear and also different gear ratios. I have not counted crown and pinion gears, so I do not know the gear ratio's in all cars, except that cars in Class-1 & Class-2 are limited to use the stock 27 teeth plastic crown. Feel free to inform me of this and I will add the info later.

 

Motor power is not how you win this proxy, to win you need a well handing car that is easy and forgiving to drive while it has the ability to generate good traction on various surfaces, so IMO the weight and weight distribution combined with the track width and guide lead is more interesting, granted that the car runs smooth and the guide is properly seated into the slot.

 

The "Lead/Track ratio" is simply guide lead (distance between rear axle to pivoting point on the guide flag) divided with track width (measured from outer tire shoulder to outer tire shoulder).

 

Enjoy dissecting the data :huh2:

[gazza]

Thanks Tore

[Yngwie]

Great roundup Tore. Congrats!

[Ontheflipside]

A lot of work put in there Tore. Plenty of great pics as well.

 

Looking forward to them hitting the hot dusty tracks down under :huh2:

 

Mel