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Author Topic: Four engine liner...  (Read 7180 times)
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problem child
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« on: October 01, 2008, 01:39:21 AM »

Having been a fan of Bonneville ever since I built a model of Mickey Thompson's Challenger in the 60's I have always wanted to pursue a speed record of some sort. I've been to the salt on several occasions but with three hot rods already in the garage I didn't feel brave enough to entertain discussing a fourth car with "the Lady who Likes to Park her Turbo PT Cruiser in the Garage". I do have a small cup of 'the salt' on my desk to remind me why I go to work.

Instead I became part of ROSSA, the Radio Operated Scale Speed Association and we build R/C cars that will run well over 100 mph. Mine has somewhat replicated Challenger in that it's four wheel drive, four engines and I'm attempting to return the nitro record back to the USA from Britain.

The American meet is this weekend at Rockingham Dragway. It's the first meet for my car and it has hit 110 on an inertia dyno, smoking the tires trying to drag the rollers higher.

Here's a few pics of my car. It's powered by four .21 cubic inch Picco engines, each putting out just over two hp on 30% nitro. The body is my first attempt at vaccuum forming carbon fiber...there's plenty of flaws but the next copy will be better. Just didn't have time to make another before the meet.

If you're interested I'll post some videos of the event next week. Hopefully there will be an electric car running which has unofficially hit 145 mph!









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Brian Westerdahl
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« Reply #1 on: October 01, 2008, 06:13:46 AM »

Hey that is pretty cool.  Let us know how it goes.  Good luck   If you get a chance get out to the salt and check it out.  The great white dyno.  Brian
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Stainless1
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« Reply #2 on: October 01, 2008, 07:10:14 AM »

You just need to talk to the USFRA to see if you can run that on the 130 course.... 09 ... what is the range on the radio?  Probably need at least a mile....
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Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
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« Reply #3 on: October 01, 2008, 08:21:43 AM »

Cool. How big is that? Wayno
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Glen
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« Reply #4 on: October 01, 2008, 08:53:32 AM »

I don't think the photo cells are that low. huh
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Glen
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« Reply #5 on: October 01, 2008, 09:11:39 AM »

 grin

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Glen
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« Reply #6 on: October 01, 2008, 10:02:12 AM »

I repeat, the photo cells are about one foot off the ground. Is you RC car that high?? I don't belong to USFRA but I almost doubt they would make them lower for a few RC vehicles. Best they answer that though.
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Glen
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« Reply #7 on: October 01, 2008, 03:29:24 PM »

Wayno - The car is about 30" long (max it can be is 36") and weighs about 12 pounds. I know I don't want to be anywhere near it at speed!

Stainless - the salt would be too rough to run on. Even some paved roads are too rough. Modern radios use cell phone technology and have 1/4 - 1/2 mile range easy. The problem is my old eyes only have 1000 foot range!

Glen - I think you're right. Even the drag strip lights are too high for some of the cars. We use a separate timing system to calc our speeds. A drag strip gives us a scale 2 1/2 mile run up but I was driving on a beautifully smooth, newly paved stretch of freeway thinking a chase car would allow a longer run up and maybe rival the 200 mph speeds of tether cars. Now, I just need to get CalTrans to give me a permit!

Thanks for your comments.....



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McRat
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« Reply #8 on: October 01, 2008, 04:00:50 PM »

A nice Shark Fin up top could trigger the beams and perhaps even assist high speed stability.

Best place to run would perhaps be to talk a dragstrip into it.  No ambulance, fire, or staging crew, you might get a pretty good deal on a track rental.  Maybe even get them to let you run it a pass or two while they are setting up for a test-n-tune meet.



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Glen
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« Reply #9 on: October 01, 2008, 04:24:42 PM »

NHRA made all of the motorcycles add a wheel ring to the fronts  so the photo cells would be able to pick them up. We had a problem at Bonneville a few years back and had to buy new photo cells to read the small area of the MC wheels (break the beam) Adding a vertical fin might still be a problem unless it was long as well as tall enough. huh
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Glen
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« Reply #10 on: October 01, 2008, 04:54:24 PM »

Since that photo was taken I have added sort of a pro stock tail with two end verticals. I've not had the car over 90 yet and it was quite stable there (the gyro helps!) but Id rather have the fins and not need em then need them and not have em.

McRat - a drag strip (Rockingham)  is where were running this weekend. They were kind enough to let us use the strip for free but were sharing it with a testing pro stock team.  In the future were going to try Vegas and Sears Point (right by me!) Surprisingly, most NHRA/IHRA drag strips are busy every day the weather allows.
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sockjohn
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« Reply #11 on: October 01, 2008, 05:06:03 PM »

I have a few coworkers who are serious runners/triathletes.  They spent a couple of bills for watches with GPS built in, might be able to fit one of these in.

Not sure if they have peak speed/avg speed functions, but considering the intended use most likely does.
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artmodelman
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« Reply #12 on: October 01, 2008, 05:50:03 PM »

Nice RC model of the Challenger.
I'm glad you enjoyed building the Revell model of Mickey Thompsons Challenger when you were younger. I designed the kit when I worked at Revell in the sixties.
Post your speed and time here when you do run the car.
Best of luck,

Jim Keeler

artmodelman@yahoo.com
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Jim Keeler
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« Reply #13 on: October 01, 2008, 06:21:40 PM »

Wow, Jim! So nice to hear from you! Thanks for your kind words It was supposed to be closer but the aero dictated more downforce. The spirit is in there. Just so ya know the effect it had on me (at probably 11 or 12), I would get up in the middle of the night, take the kit into the bathroom and work on it while everyone else slept. That car made me a fan of the salt flats forever. I kept one of the re-pops on my work bench as I built this car. I have one of the original kits and a couple of the newer versions. I visited the actual car at Peterson's and now the NHRA museums and am in awe that it still exists. What is amazing to me is just how small it is. My version is huge compared to a normal 1/10 scale car.

I hope that I'm able to make my runs without breaking a driveshaft! There will be videos posted on various sites....I'll make sure to post them here also.

Gary O
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Rex Schimmer
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« Reply #14 on: October 01, 2008, 10:57:00 PM »

Gary,
Your car is SOOO neat!! Really keep us informed on how you do. A couple of suggestions, if the max length is 36 inches add 6 inches on to the rear of the car with less of an angle it will make your car much more aero, it is the back that counts not the front. Also give it a nice coat of bondo and sand the surface real smooth then paint, much better than the rough carbon fiber finish.

Great looking piece!!!

Rex
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Rex

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