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Old 05-22-2012, 09:00 PM   #61
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Originally Posted by dfiantii View Post
Doesn't Tamiya have something where a hole is cut into the carbon fiber below the motor and a duct of some kind is connected underneath to route air to the motor? That might be an option.
this is what you're referring to..




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Last edited by Minami; 05-22-2012 at 09:02 PM. Reason: oops;; sry for the large pics
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Old 05-23-2012, 10:07 AM   #62
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The design of your car project looks cool.How long have you been working on it?Also, I am eagerly awaiting to see the image of the prototype that you will soon post.Thanks and good luck.
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Old 05-24-2012, 01:55 AM   #63
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Originally Posted by erricsimmons457 View Post
The design of your car project looks cool.How long have you been working on it?Also, I am eagerly awaiting to see the image of the prototype that you will soon post.Thanks and good luck.
There are pictures here:

http://www.rctech.net/forum/10758776-post54.html

I started designing it in October 2011, so about 7 months from conception to track test. I spent a lot more time designing it that making it, as changing the design doesn't cost anything.
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Old 05-24-2012, 02:23 AM   #64
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Can I ask where you are getting your fibreglass from in the UK and what thickness - I have been so impressed with your 'blog' that I might make a mashup of a TC6 and Team Magic E4 to play about with.

And do I read it right that you have a supplier who can supply custom sized belts?

Keep up the good work - very interesting...
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Old 05-24-2012, 07:49 AM   #65
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Originally Posted by scoyle View Post
Can I ask where you are getting your fibreglass from in the UK and what thickness - I have been so impressed with your 'blog' that I might make a mashup of a TC6 and Team Magic E4 to play about with.

And do I read it right that you have a supplier who can supply custom sized belts?

Keep up the good work - very interesting...
Chassis fibreglass (2.4mm) comes from here:

http://www.modelshopleeds.co.uk/cata...oducts_id=2709

Topdeck fibreglass (2.0mm) comes from here:

http://hobbyplastic.co.uk/index.php?...ex&cPath=52_54

I haven't managed to find 2.0mm in sheets big enough to make a chassis, hence the 2.4mm which is quite stiff, but the car handles very well regardless, and its fine for a prototype.

Belts are from here. They will cut to width, and have a good range of lengths:

http://www.beltingonline.com/3mm-htd-timing-belts-4573


Glad I'm inspiring others to take RC back to its roots (i.e. blokes making things in the shed)
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Old 05-24-2012, 08:58 AM   #66
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Glad I'm inspiring others to take RC back to its roots (i.e. blokes making things in the shed)
Thanks for the info... decided to build my own car so that I can blame that when not on the podium
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Old 06-08-2012, 03:44 AM   #67
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Small update. The HW Xtreme Stock ESC is now installed. It's very small and tidy, and only 35g without wires. Unlike the normal Xerun and GM75 the wires can easily be replaced, so I've cut them to size for this car making things a bit neater (still needs a bit more tidying around the receiver).

I've also installed the Yeah Racing Tornado fan. With a slight sand it just fits in under the top deck. With the extra air moved by this fan, and the improved position blowing onto the metal can rather than the plastic endbell, this should drop the temperature a decent amount.

And finally I've cut a bigger hole in the chassis and lowered the motor down into it, for a lower CoG and better cooling. Sorry forgot to take a picture of the underside; I'll do this next time.

The car is now ready to race... if it ever stops raining in the UK
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New car project TC6-C-20120605_223800-1024.jpg   New car project TC6-C-20120605_224000-1024.jpg   New car project TC6-C-20120605_224031-1024.jpg  
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Old 06-08-2012, 01:07 PM   #68
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I see you put lead on the left side of the chassis; have you tried to flip the batter around or does it need it to make weight?
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Old 06-10-2012, 03:04 PM   #69
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Originally Posted by nrtv20 View Post
I see you put lead on the left side of the chassis; have you tried to flip the batter around or does it need it to make weight?
I need to take my Novak Sentry datalogger off my other car. Once that's fitted (somewhere near the fan/motor) most of the lead will come off as it weighs about 15-20g with the sensors. So the lead is just a placeholder for now
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Old 06-14-2012, 03:25 AM   #70
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Well we finally had a dry Wednesday evening at Bedworth, so last night the car had its first race

The short version

I matched my best ever time for 13.5 in just the second heat! So a fantastic debut for the prototype car. It was reliable and consistent all night. Motor temperatures were only 80-85deg this time so the cooling work has paid off.

The longer version

The car ran a practice, 3 heats and a final. It finished all races and was consistent and nice to drive. The results were:
19/308 (crashed in this run, should have been 19/303)
19/300 (same as my PB)
19/301
19/301 (would have made 20 laps if this hadn't been a final with a slower first lap).

Good points:
  • The car was reliable. Nothing fell off, jammed or went wrong.
  • The car has noticeably better direction change than the TC6 through the tight chicane, it really flies through there. The tight weight distribution definitely does what it's supposed to!
  • The three-belt drivetrain seems to be running fine, the car was as fast as the other 13.5 runner and only a fraction slower than the 10.5. Battery capacity used was the same as with my TC6 (2500mah) so it's not using more power or ending on a lower voltage.
  • The car got lots of attention, due to its radical layout and handling on track. Frankly we're all bored of seeing clone TCs...

There are still plenty of issues to fix, so there is loads more potential in the car. The issues were:
  • Unstable on the straight. This is due to the steering link being mounted too close to the centre of the bellcrank. Any play in the servo results in a large movement in the front wheels. I'm going to fit a much shorter servo arm which should solve this issue. Currently my steering EPAs are only at 60% (on my normal TC6 they are at 110%), so you can see how the steering layout is amplifying the servo movement, and also amplifying any servo play.
  • Massive drivetrain drag under braking. This looks to be because the front and middle belts are dragging on the chassis and lipo holder under braking. I didn't think this would be a big deal, but when I lift off for the sweeper it feels like I'm running a massive drag brake, so maybe it's an issue afterall! I just need to raise the front layshaft 1-2mm to fix this.
  • The middle belt flipped over some time during the final. Not quite sure how I still managed such a good time with the car like this! It did feel a bit tail happy, but the belt was still tight enough to provide some drive to the front so it wasn't 100% RWD. I'm hoping that this was just caused by the belt rubbing, but it may be that the middle belt needs a roller to keep it stable. Or it may even need a slightly wider belt (it's currently 3mm, the pulleys can probably take a 3.5-4.0mm belt). For now I'm going to leave this alone and see if raising the layshaft stops it happening again.
  • The rear belt is slipping a bit, and the drivetrain still feels a bit tight. I need to do a v2 chassis that moves the main layshaft forwards about 0.5mm to tighten the rear belt and slacken the front belt (i'm already at the maximum settings on the diff cams).
  • The car was struggling a bit over the bumps. My TC6 on the same setup is fine over the bumps, so I think this is due to the chassis being a lot stiffer. For the final I went to softer springs (HPI Blue) and this totally cured it, but the handling wasn't as sharp. So more work on setup is needed, and I need to make a skinny topdeck so I can try a more flexible setup.

Summary

I'm delighted with the cars first run. My v1 fibreglass prototype, with lots of issues still to sort, is as fast as my regular well-sorted TC6 that I've got 18 months experience with.

I'm going to sort out the steering play and belt drag for the weekend, so hopefully if it stays dry I'll finally get onto 20 laps.

Thanks for reading and for all the positive feedback. It's been 8 months since I started this project (most of that spent getting the design right), so finally getting to race it is a major milestone
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Old 06-14-2012, 04:07 AM   #71
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Now, can y test it under modified engine ?


About servo horn, I had this mod at my tc5/tc6/tc6.1 because need more space for electronics.

With longer arm it is always nervous ... small move on servo = big move on link, when arm is long ...

But if it is too short is bad also ...

I was using servo saver from mt-4 truck (ae product/thunder tiger) on low hole (less arm then tc6.1 servo horn) but it feels 'lazy', now I will put servo horn (slighty longer arm, ~1mm?) for more fast response.

Servo is bls551 futaba ;-)

Will see ... this weekend.

I will keep eye on your project, maybe some kit ? for modified ?
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Old 06-14-2012, 10:49 AM   #72
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0% chance of me testing it with mod, as the class isn't run at any level in the UK any more.

It would be great to make this into a conversion kit and sell it, but I think the price would make it unviable. It requires 4 bulkheads, a motor mount, 3 pulleys, one spur adapter with pulley, two layshafts, a chassis and top deck. For a small run of kits it would end up retailing at around £300GBP for the conversion. Then most TC racers would also need a couple of Shorty lipo packs at £80 each...
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Old 06-14-2012, 06:26 PM   #73
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Then most TC racers would also need a couple of Shorty lipo packs at £80 each...
I bought my shorty packs from gn-fusion on ebay for $106 for 3 packs, and they are very good too. read my blog for the review.
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Old 06-18-2012, 02:21 AM   #74
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As promised, here is a shot of the underside of the car with the enlarged motor hole. I think this is my favourite angle; it's a narrow chassis but hardly any of the electrics/lipo are visible as everything is so tightly arranged. There's also a lot less scraping on the sides of the chassis than the TC6 (the scraping at the front is from riding curbs, and the fact the chassis is 0.5mm too thick for the bumper to protect).

The car had it's second race meeting on Sunday with 100% reliability. I qualified and finished 3rd (out of 12) with the car, with 5 consistent runs. Once again a fraction off 20 laps and matching my TC6 times, with a car that still needs some work.

The Tornado fan died at the start of the day. As others have noted, these shift a lot of air but are unreliable on 8.4v. I'll try the second fan on 6v from the receiver and see if it lasts a bit longer! The dead fan resulted in a 10deg temperature increase to about 90deg, which is well within the safe limits of the X12 motor (120deg upper limit). So the bigger motor cooling hole has helped massively in keeping temperatures down.

A few more comments from other racers on how well the car handles. I seemed to have a lot more drive off an anti-camber corner than other cars and made two great overtakes out of this corner in the finals. And the direction change round the chicane is amazing.

At the moment it's losing time under acceleration and braking due to rear belt slip, so I'm going to make up a tensioner for now until I've got time to do a v2 chassis with the layshafts moved to tighten up the rear belt.

I'm also going to do a skinny topdeck to see how the car responds to more flex, as its still quite stiff.
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Old 06-18-2012, 07:58 PM   #75
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Good to see you're beating CF'ed out cars with your fibreglass chassis. Goes to show that design is a big aspect of racing.

Will you be moving to CF? Any advantages of that (over the fibreglass chassis) other than flex characteristics?
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