that is so cool, it is really coming together

:surprised:

Cane and Able, Mamy the lord oh mighty!!!!!

looking good dude....

Man that's too cool, I hope all goes well and steering is maintained, or else its just gonna go straight like a bottle rocket, have you considered using a front wing to add extra down-force while driving?

FREAKING AWESOME! You gotta take a video, you just GOT TA!

If nothing else it will make a seriously cool desktop fan for the summer months. I cant wait to see it in action!

Did you aim the fan down a tiny bit (rear end up) so it pushes the car into the ground. The jet dragsters do that so that they stay drag cars and not drag planes, I think I read they only aim them down 1 degree or so.
I wouldn't have a clue how much load is going to be on that motor a full speed, but a lest you've got one serious cooling fan so heat shouldn't be too much of an issue for the motor.

I think your right patrick...

I can't wait to see the video.. if you take too long, I'll build one a make a video.. :)

JUST bought the batteries!
 

I just bought them about 2 minutes ago. The 7075 plate should be here monday so I can start making the tray. :yes:

I think 160A continuous will fit the bill. Not to mention they FIT! One on either side of the chassis, laying down. :yes:
I upgraded to the 12AWG wire and got the AF Blinky taps.

Here they are! www.MaxAmps.com

Those are nice batteries...

Yes, they are. I'm gonna buy another pair for the Rustler after my wallet recovers for a bit.

Check out what I just saw on eBay.
http://cgi.ebay.com/NEW-1-10NEW-ERA-...QQcmdZViewItem
It's along the same line as this one.

Here's what I have to say about that- :lol: :na: :rofl:

I like the chassis, though. Would be nice for BL "wheel" power. :yes:
If I hadn't bought the batteries I would bid on it! :wink:

Speaking of the batteries, I changed my order from the 2, 2s2p, 8000 packs to 2, 4s, 4000 packs. (possible 8s setup in my future?)

That's a very wise choice, you should always plan that kind of thing in case of future 'choice'.:yes:

Any updates?

Hey thanks for the bump. :tongue:

I took this pic a while ago but forgot to post it. It's the other wing that I had for the Rustler. I found some brackets and mounted it in the front. It looks nice and should provide lots of downforce too. I have to find another body because the wing gets in the way of the Lambo' shell. I'm thinking a 1/8 buggy body so it's wide enough in the middle to cover the batteries. Any suggestions?

http://i52.photobucket.com/albums/g4...d/DSC00029.jpg

Slight change in plans also. I'm putting the 9XL in the Rustler for a while until I can decide on a new motor. I'll get an 8XL to put in the fan. :yes:

An XL can in a rustler, man, that thing will fly.... or explode in a shower of high revving gears; I like. As for the fan car, almost looks an F1 body would look good with that front wing, but I dunno how wide the side pods are, probably wont cover the batteries enough. What about one of those wedge shaped bodies- I forget what cars they go onto but you know the type I mean.

The new MaxAmps packs came today! :party: :yipi:

These are sweet batteries. The first thing I did after I unwrapped them was cycle them. Discharge to 3.2V/cell at 1C (4A). Then charge at 1C. They both took over 3930 mAh! I'd imagine that they're slighly underrated as far as capacity goes. If I were to discharge to 3V/cell they would definitely take more than 4000 mAh during the subsequent charge cycle.

Did I mention that they fit absolutely perfectly next to the chassis? See! It does pay to measure twice! I also installed a set of 5.5mm bullet connectors on each pack.

http://i52.photobucket.com/albums/g4...DSC00046-1.jpg

http://i52.photobucket.com/albums/g4...DSC00048-1.jpg

http://i52.photobucket.com/albums/g4...DSC00047-1.jpg
^^^ Perfect!

all i have to say is wow... sweet project!!

i can't wait to see it in operation... seriously. you're an inspiration to us all!!

:great::great::great:

That is so sweet man!! You have got to get some video of it running once it is completed.

I will make a bench test video in the near future. A road test video will take a bit longer since I'm still trying to work out the brakes.

I need to do three (3) things to finish this project:

1: Cut/bend the battery trays.

2: Solder-up a parallel plug for the batteries.

2.0001: Figure out the brakes...
2.9999: ...etc.

3: Done!

done! is not a thing...

you have two (2) things you need to do to complete this project... get 'er done!!

Are you still goinf with the magnetic brake drum idea was it, or something different- I think some kind of disc brake mounted on the rear shaft would be good provided you could fab a hub/mount for the disc, then you just have to build somewhere for the pads to mount and then link them to a brake servo.... sounds so much easier when you type it, but building it is somewhat harder me thinks..... good luck!!!

I abandoned the magnetic brake because I could'nt find magnets with the correct radius, and because it locked out the differential which cut my turning radius a bit. It made the tires slide instead of roll and the foam wouldn't last long like that.

The only problem with a disc brake, as well as any other brake, is that it needs to be able to stop both sides of the differential or it wont do much at all. Usually this means replacing the differential gear with a brake disc with holes cut out for the diff balls. I thought about this method but I don't have the tools to be precise enough in making the custom disc, and I don't think any stock brake disc out there has the holes in the correct places let alone the right size hole in the center to fit the bearing.

I think I will try to modify the stock differential gear with some metal rings on the side for a disc brake setup. Some standoffs to hold the calipers, a servo, and voilla! Done! You're right- it does sound easier when you're typing it!

Use a pinion gear meshed with the diff gear like stock and attach the disk brake to that, at least it will brake like a stock electric motor vehicle would.

Ooh, good idea. If the stock motor mount was there still you could rig up a mechanism in the motor's place.... nice thinking that man.

Thanks neil, love that blue blob killing off the red blob, he sure is handy with a pistol!

I only say that cause I have experience with a f103gt. Never had any luck getting mine to track straight, so I sold it. Possibly mount a cut down section of a 2wd nitro trans so that the disk brake sits where the motor usually does and the shaft extends out to allow a pinion gear to be fitted. If the section was small enough a sub sized servo could be mounted on the other bulkhead and it would all be contained inside of the motor pod. It would add some unsprung weight though.

I dont think a few extra grams would make that much difference really, especially given the size of the motor/fan. **does the bonkers dance again**

I do have a disc brake setup from a N*tro Rustler that I could try to make work. I'd just have to fab some brackets and figure out a way to fit a pinion on, like lincpimp said. It would be sweet if everything could be made to fit in the motor pod.

I wish I still had my f103, I could make you a disk brake that would fit the bill just fine. The only problem i can see is that the shaft that the brake and pinion are on would have to be supported with 2 ball bearings. You could use the ctr bulkheads from a 1/8 buggy to hold the bearings and turn one inside out to but the brake assy between the bulks. The you just need a shaft that has the correct interface for the disk and machined down to 1/8" for the pinion. Or you could make the required bulks and shaft from scratch and use whatever brake disk that would fit in the space. Would be no bigger than 35mm, same size as a 540 motor.

Thanks for the help. I can't work on it right now since I'm in Arizona visiting family. When I get home on the 9th I'll take the topshaft out of the Rustler tranny and see how it fits.

What about reverse thrust as brakes? It seems that would be so easy to set up that it would be worth trying.

B15, the thought had occurred. I could do it, but it would require much more fabrication. Physically turning the fan around would be impractical, and reversing the fan would not work well since the thrust produced while running in the reverse direction would be minimal. The only other way would be to construct ducting around the sides to face forward, and then a means to convert from normal thrust and re-route the air through these side ducts. Extra servos/radio channels would be required. It wouldn't be as easy to drive with either, if you think about it, since brakes can usually stop a vehicle much more quickly than the vehicle can accelerate. With reverse-thrust brakes it would be a 1:1 ratio between acceleration and braking, therefore you need as much room to stop as you did to get going at that speed. I can see this method working perfectly for a drag car since they usually have plenty of room to stop.

I think youre going to have this problem anyway; if that fan can produce 5lbs of thrust, its going to be accelerating at well over 1g. The rear wheels wont be able to decelerate it anywhere near that hard.

If need be I'll put rubber slicks on the rear axle, instead of foams, to get some extra stopping power. If it turns out that this thing can't stop well enough then I might consider an air brake as well. Like the big flaps that open up on a 747 when it lands.

Provided power to the fan was cut at the same time the mechanical brakes were applied, that should slow the car down pretty quickly. I would have thought quicker than with a normal motor & gear driven car since there isnt the need to slow any rotating mass of the the motor/transmission down before the brakes kick in. If you had a strong enough brake you could lock up the rear wheels and skid the car to a stop rather quickly I'd have thought- useful for emergency stops...:whistle:

It doesn't need brakes for emergency stops. You hit the third channel button and little wings pop out the side, then you just fly over whatever was in the way.:na:

Maybe someday the project will be that advanced. :whistle: I think I would need a larger chassis to fit everything. :yes:

The problem with stopping this thing is going to be that tires cant accelerate/ decelerate a car with much more force than is being pushed down on the tires (weight of the vehicle). The fan is going to be accelerating it quite a bit faster than tires would be able to, so its going to need more room to slow down than to accelerate.

Is this gonna be fast enough?
 

:lol: :yipi: :surprised:

http://i52.photobucket.com/albums/g4..._TamiyaFan.jpg