Anyone else done a Cubmobile Race ?

General cubmobile related topics.
Post Reply
User avatar
KLenort
Journeyman
Journeyman
Posts: 25
Joined: Sun Jan 04, 2004 11:02 pm
Location: Southern Minnesota

Anyone else done a Cubmobile Race ?

Post by KLenort » Sat Jan 10, 2004 7:52 pm

Thanks to Randy for adding this section ! :bigups:

We took the Cubscout Bear Book Elective 7 "Things That Go" and built these Cubmobiles (cheap version of a soapbox) and raced them as a district event. Although our derby was a smashing success, it still has room for alot of improvement. Anybody else done it ? Looking for some ideas on timing the runs (we used stop watches last year). I would definitely recmd this to any pack looking to boost summer scout involvement. :dance:

Image
Image



User avatar
Darin McGrew
Pine Head Legend
Pine Head Legend
Posts: 1735
Joined: Fri Jul 18, 2003 1:23 pm
Location: Mountain View, CA
Contact:

Re: Anyone else done a Cubmobile Race ?

Post by Darin McGrew » Sat Jan 10, 2004 8:33 pm

KLenort wrote:Anybody else done it ?
My friends and I built them back when I was a cub scout, but we didn't do it as part of scouting. We just took them to the dirt roads just outside of town and had fun. One lesson I remember, is that a narrow wheelbase is bad, especially when there's a turn at the bottom of a hill. :-)

From your photos, it looks like your cub scouts don't have that problem. But I'm curious--how does the starting gate work? It looks like the board blocking the rear wheels drops down into a slot, but the rear wheels don't look big enough to clear the slot cleanly.



User avatar
KLenort
Journeyman
Journeyman
Posts: 25
Joined: Sun Jan 04, 2004 11:02 pm
Location: Southern Minnesota

Re: Anyone else done a Cubmobile Race ?

Post by KLenort » Sat Jan 10, 2004 9:02 pm

darin_mcgrew wrote:From your photos, it looks like your cub scouts don't have that problem. But I'm curious--how does the starting gate work? It looks like the board blocking the rear wheels drops down into a slot, but the rear wheels don't look big enough to clear the slot cleanly.
The parent that came up with the ramp did an excellent job without having any sort of plans to follow. The gal holding the pipe in the middle starts the cars. That pipe holds up the 2x4 in front of the wheels, when she pushes it forward it drops the board down flush letting the cars both go simultaneously. The only proble (as you can see) was that the ramp wasn't large enough to give the cars enough kick, hence the loose plywood. We thought that our hill was big enough and we didn't want the cars going too fast so the ramp was built with only the back tires on the ramp (big mistake). We will be rebuilding the ramp, just need to design it larger and able to disassemble for storage.



User avatar
Da Graphite Kid
Master Pine Head
Master Pine Head
Posts: 327
Joined: Thu Jul 03, 2003 6:29 pm
Location: Eufaula, AL.

Re: Anyone else done a Cubmobile Race ?

Post by Da Graphite Kid » Sat Jan 10, 2004 11:42 pm

KLenort,
I'm like Darin and was wondering how the start gate worked. I looked over the link that Randy gave and assumed :roll: that it worked as the one described. I know now that it works opposite. I'm thinking that this is the better set-up.

Also like Darin, we used to build these when younger as we had street with a great slope and a 90 degree turn at the bottom. Too bad we didn't make cubmobiles - the brakes sure would have come in handy! :shock:

One of our Pack leaders and I have been discussing a cubmobile race for our Pack but have not been able to get the local Police or State Park to let us have a road to use. We are in the (very) early stages of discussing a cub push-mobile race. Now I'm wondering how high we would have to build a ramp to get a little speed on a flat parking area...

Before I forget: Randy thanks for adding this section to Derby Talk!

Da Graphite Kid



User avatar
KLenort
Journeyman
Journeyman
Posts: 25
Joined: Sun Jan 04, 2004 11:02 pm
Location: Southern Minnesota

Re: Anyone else done a Cubmobile Race ?

Post by KLenort » Sun Jan 11, 2004 5:35 pm

I wish I could answer your starting ramp questions better. I organized/planned the event but didn't design the ramp. I didn't look at the mechanics of it at all. I was just happy we had a ramp that worked.



User avatar
ranman106
Master Pine Head
Master Pine Head
Posts: 357
Joined: Tue Oct 14, 2003 9:31 am
Location: somewhere, north carolina

Re: Anyone else done a Cubmobile Race ?

Post by ranman106 » Tue Jan 20, 2004 10:28 pm

KLenort wrote:
We took the Cubscout Bear Book Elective 7 "Things That Go" and built these Cubmobiles (cheap version of a soapbox) and raced them as a district event.
Thanks for posting this thread and pics! Our Cub Scout Bear Den is building one of these for our district Scout Show! :D But we don't have hills where we are so no racing YET!

Our den leader was thrilled when I told her about seeing these on the forum! Our Scout Show is March 20 and I'll post pics when we get it built!



singerk
Apprentice
Apprentice
Posts: 4
Joined: Mon Jun 28, 2004 5:52 pm
Location: Delmarva

Re: Anyone else done a Cubmobile Race ?

Post by singerk » Mon Jun 28, 2004 6:07 pm

:D Check out one of our Pack's Cubmobile site at http://pack532.org/cubmobile/index.html these guys have a great race every year! Also, we have a District race... check our flyer from District site at http://www.choptankdistrict.org/cubmobile-04-flyer.htm

We're working on an electronic timing setup for this year's District site, but it's too early to make a posting for it. Will advise.

Have FUN!!!!



User avatar
Da Graphite Kid
Master Pine Head
Master Pine Head
Posts: 327
Joined: Thu Jul 03, 2003 6:29 pm
Location: Eufaula, AL.

Re: Anyone else done a Cubmobile Race ?

Post by Da Graphite Kid » Wed Jun 30, 2004 11:50 am

Singerk,

Definately let us all know about the electronic timing system that you come up with.

Some questions:
Why not allow "smooth axles with pins" (cotter type)?
What sort of racing format was used - double elimination?
Was this a team/Den effort or were these individual Cub Scouts that competed?

Some thoughts that we had (they are so few nowadays... :oops: ):
- The Pack would buy and own the wheels and seatbelts used. This way it would make it more affordable for all to participate and not give any one team a racing edge by using some 'special' wheels/bearings.
- Competition would be between Dens. This makes it a Den project and would involve all of the boys who would each have to race at least once.
- Pack Leaders would race (that was my idea :wink: ).


Da Graphite Kid



singerk
Apprentice
Apprentice
Posts: 4
Joined: Mon Jun 28, 2004 5:52 pm
Location: Delmarva

Re: Anyone else done a Cubmobile Race ?

Post by singerk » Wed Jun 30, 2004 9:33 pm

Howdy!

We had a Pack that thought that the solid axles were an advantage, so we eventually went to mandatory lag bolts. Solid axles are much stronger and can be strapped to the bottom of the wood - instead of weakening it with a hole. If a hole is bored, you can put another 2X4 on top. In fact, the "top plate" can be used to bear against... so that there's less chance of a foot slipping into the wheel.

With a lot of racers, it works best to have everyone run once in each lane and average the times. May want to consider having the stopwatch stopped upon crash - starting back up once he's underway. This doesn't ruin his chance to place well.

If you can do a free-for-all lineup at starting line (maybe by "all W2's" then "all Tigers" ...) it will flow much better than calling racers to the line. Stack 'em up for the starting line (all straped-in) and lift them onto the ramp. Better yet, have the ramp slope on each side!

The wheels shown below are VERY reasonable (and fast). Wheels are the most difficult to even-up... everyone's looking for an edge.



racerock
Apprentice
Apprentice
Posts: 8
Joined: Fri Dec 10, 2004 9:41 am

Re: Anyone else done a Cubmobile Race ?

Post by racerock » Thu Jan 06, 2005 11:55 am

We made cubmobiles this past year, and they turned out well. Used a solid axle, made two within the den.

Problem was that a lot of the boys could not keep them running. Our road had a slight bend, and they would get into this oscillation, or just flat out over turn the car. Result was that about 25 - 50% ended up falling over.

Anyone have this problem?



User avatar
sporty
Pine Head Legend
Pine Head Legend
Posts: 3355
Joined: Sun Feb 13, 2005 2:00 am
Location: rockfalls, Illinois

Re: Anyone else done a Cubmobile Race ?

Post by sporty » Mon Feb 14, 2005 7:43 am

Well My so has Done the Cubmobile 2 years in a row, The first year he got 3rd place and last year 2nd place. Likely he would have gotten 1st but got nervous on the main event.

I will share that we pretty much followed the spec's to a tee. Nothing overly done with the wood and shapes.

I spent a great deal of time, ensuring that the angle was right with the wheels and that it was squared well. I used 12 inch wheels from farm-n-fleet. Used break cleaner to clean the bearings and wd-40.

Steering to me is the bigest issue, next to first coming off the ramp. That little bounce and how your child deals with it, is everything. I kept the blocks close and the lag bolt fairly tight. I found that i did have to tighten it up after every other race.

Anti-vibration is a key also. When I mounted thr 5/16 lag bolts. I used a washer in front and beghind. Now i seen people insert the bolt into the wood or use blocks in between the lag bolt. I used metal clamps with hard rubber. To dampen vibration.

I saw no difference in the 10 inch or 12 inch wheels. Speed wise.

My son was the lightest kid on the track, I did use oak wood for added weight versus pine. Btw Oak has not gotten any cheaper in it's day.

I am very curious to the people who have used the wheel chair wheels and how they faired in the races. I would consider trying them. If i felt they were a better whee.

And if slick wheels over treaded wheels make much a differance. Ours were treaded.

sporty



clemsontigerfanatic
Master Pine Head
Master Pine Head
Posts: 189
Joined: Wed Sep 22, 2004 2:42 pm
Location: South Carolina

Re: Anyone else done a Cubmobile Race ?

Post by clemsontigerfanatic » Wed Feb 16, 2005 10:28 am

ranman106 wrote:[Thanks for posting this thread and pics! Our Cub Scout Bear Den is building one of these for our district Scout Show! :D But we don't have hills where we are so no racing YET!
Cub Scout Pack 215 in Anderson SC had a video of a cubmobile race
in a flat parking lot or almost flat parking lot on there website.
They use push bars to get the car started. 2 boys push from behind.
I tried googling it and its down right now.



Post Reply