Dragons Hobbies Forum
Radio Control and Models => Tyco RC => Topic started by: SuperBandit on February 26, 2009, 08:54:12
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Here is some pictures of a small project of mine.
I took the lower chassis, A arms, front wheels and the red body of a classic old Jet Hopper.
The car had problem with its electronics and could not run.
The rear axle (with very fast gear set), rear wheels, upper chassis, and electronics from a yellow Head's up jet Hopper. This other car came with a broken A arm and the yellow body was kept together just by glue.
I modified the position of the spare wheel in order to protect the power pack when the car tumbles upside down.
This is the result:
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1397.jpg&hash=f31e41ee6a41164ced4d5685e2785f41cac4d6da)
I build my own power pack with 2900 mAh cells that can last longer than the packs that are available.
And today I added an extra cell bringing the overall voltage to 10.8v ;D
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1400.jpg&hash=46c7ebaf9c2e373cfa2fcf03df63d20b9047b1d4)
As you can see, the extra cell is on the right hand side, while the Tamiya plug is on the left.
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1407.jpg&hash=cb9b5d6447ca234774140790e774b9ed87ebfc12)
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1402.jpg&hash=b429d9feab40a96a277fed10846f5f6c3c302a6f)
Below a picture of the powerpack removed from the car
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1410.jpg&hash=c97655a18e7b5b0956f1c8fc79b541e200a4a938)
And a close up of the rear from where the power plug exits the chassis
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1411.jpg&hash=5fc6bb73d012ea45352fea50319f57fb29019387)
Another picture of the overall assembly
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1396.jpg&hash=510bb479bba96c1fe733eddd282583445011f5d4)
Rear View
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1394.jpg&hash=cfd384ad20e63016b801d5fde7d488fc5767a79e)
With the extra cell the car is very fast although it is very hard to control.
My next experiment would be to add an extra cell to bring the overall voltage to 12V.
Do you think that is going to fry the electronics???
Thanks for looking,
giovanni
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Nice, I did something similar using a 2 AA battery holder ( http://media.digikey.com/photos/Memory%20Protection%20Photos/BC22AAL.jpg ) on the Tyco's that take 8 AA batteries. 1 extra cell is fine, but two extra cells will require you to buy a new motor very soon! The brushes in these motors are thin and don't last long at higher speeds.
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Hi ST,
thanks for the advice.
I do not know whether the holder is an option giving the limited amount of space.
I might try that on the Super Bandit where the space is not a problem under the body.
Actually, I would like to add a new motor. I know that a 380-size should be fine.
The problem is that I would not like to have one of those motors that require a lot of maintenance (i.e., changing brushes too often). Do you have any suggestions??
thanks,
giovanni
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I believe this high performance motor is the same size as the factory motor, but the end bell is longer so you'll have to come up with a custom cap to keep it in place:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAHK6&P=7
I also believe this is the factor 370 motor used in fast traxx, and other 9.6V tyco cars. It's a little faster than the older motors used in the tyco's that took 8 AA batteries:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXGLK3&P=7
You're actually not limited by motor speed, but by the current draw limit of the speed controller. You're also limited by the weak factory gears in the gearbox, as we've all stripped tyco gears without much effort. There is even a faster motor which I won't link here because it'll not only burn up the speed controller, but will burn itself up in no time at 9.6V, that is if the gears in your gearbox don't strip first.
A proper gear puller tool ( http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXHHN2&P=ML ) is a must to remove the factory brass gear!
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Thanks ST for all this info.
I tried to find a micro gear puller here in the uk but with no luck.
However, I found this other motor Graupner Speed 300 6V that has 29k RPM.
A guy mounted on his Jet Hopper and goes pretty fast.
You can see more here http://masterbsax.de/english/jht.htm (http://masterbsax.de/english/jht.htm). More info available here http://www.tamiyaclub.com/showroom_model.asp?cid=64650&sid=20877 (http://www.tamiyaclub.com/showroom_model.asp?cid=64650&sid=20877).
The guy is still using the original gears. Only changed the electronic and servo.
I might go in the end on the same route.
Thanks again.
giovanni
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Awsome project and thanks for the links! Reminds me of when I was a kid. I was allways wrecking my R/C's. I fried a lot of electronics doing this kind of stuff.
I noticed your gear shifter does'nt have the normal red lever, is this what was used on the older 8 AA car's? I have a New Bright truck with with the same kind of shifter and tranny....Have any extra front bumpers you want to sell?
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nice. ;)
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SuperBandit, RC airplane guys still uses these motors as they're still used in popular GWS planes. Check RC airplane shops for a gear puller. Yes the motor you linked is the one I didn't want to tell you about ;) It's also sold under the name GWS 350. The motor is a current hog, sucking 10-12 amps. You need a 100-150watt speed controller. The brushes don't very long at 9.6V. It's a bit faster than the 280BB motor I linked above, but doesn't last nearly as long and is less efficient. Don't even think about using these motors with the stock electronics, they'll fry the stock speed controller in no time.
jeffescortlx, he's actually using a gear box from a newer Tyco car.
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I'll look better for those gear puller. I think I found one on Ebay.
As for removing the rear wheels, which type of gear puller should I use? Any suggestions?
Thanks again for the info. But that is also where my limited knowledge in electronics stops.
I thought that esc limits are given my the motor turns. But you talk about amps. So, for instance a Mtroniks eco20 http://www.anticsonline.co.uk/1631_1_1949064.html (http://www.anticsonline.co.uk/1631_1_1949064.html) I should be fine since the limit is 20 amps. Is that right??
As for the rear axle, from tyco cars up to now I have seen three types. I'll post some pics of them.
The one shown in here is the fastest in my opinion. As it is I reckon it can go faster than 27km/h. But no precise measurements yet.
giovanni
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And sorry,
no extra bumper...
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20A should be plenty. Basicly any speed controller made for 1/8th scale RC cars, like the Mini-T will work. I had some posts about removing the rear wheels on the old forum. You'll have to custom rig something. I would use an automotive gear puller:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=40970
I would take a sheet of metal and cut a circle out of it. Then I would cut out a rectangle from the center to the outside of the circle so it can slide around the axel. This picture kind of shows what I'm talking about:
http://www.instructables.com/files/deriv/FG1/RKG4/F51ZB9TW/FG1RKG4F51ZB9TW.MEDIUM.jpg
This way you can pull the wheel using the gear puller above, but not have to worry about the gear puller damaging the wheel. I hope this makes sense. Let me know if it doesn't.
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It makes perfectly sense! Thanks again for this load of info ;D
So have you ever changed the gears from your tycos??
If yes, which one would you put in to make them more reliable?
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What I have done in the past to pull a pressed on pinion gear is, slip 2 peices of metal under each back side of the gear, then use a center punch to push the motor shaft out. I make sure all the weight and pressure is on the metal plate on the back side of the gear, and that the motor it's self does'nt get any of the force to remove it. It's free and does'nt damage any thing.
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Just a small update on the body.
I mounted the bigger rear-wing of the yellow heads up as I think gives more stability.
Here are some pictures.
Let me know what you think of this set-up compared to the previous one.
thanks for looking.
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1419.jpg&hash=8d0708b34717cfb08cb1521402a5047e0c0415fb)
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1415.jpg&hash=e3a8993879acf2bfff6827398a820b13a3441625)
(https://www.dragonshobbies.com/forum/proxy.php?request=http%3A%2F%2Fwww.doc.ic.ac.uk%2F%7Erussello%2Frc%2F_MG_1412.jpg&hash=a033a696aa809577d8a2acec1ec3f89e646dfde8)
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i like it. matches the rear wheels to. need to post a video of it in action. 8) ;)
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I tried it today in a parking lot.
It seems fast to me but I don't think that is more than the 27km/h :-\
If my math is correct at 27km/h it should do 10 meters in 1.3sec.
But I believe that it takes longer than 1.3s for doing 10 meters. ???
In the future I'll try to post some videos. But first I need to buy a new camera.
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I'm also waiting to see a video. Try not to blow the gear's right away!
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Your numbers look right:
27 (km per hour) = 7.5 meters per second.
http://www.google.com/search?q=27+km+per+hour+in+meters+per+second
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Just a small update.
The rear tires of my Super Jet Hopper slip on the rims. I think that it is due to the fact that I removed them once. I believe that this causes some loss of speed.
Do you know of any way in which I could avoid this?
Thanks for any help.
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Have you considered gluing the tires to the rims?
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I was thinking about that. But then if I want to remove them I'm afraid that to ruin them.
I noticed this also with the other tycos. Once you remove them for the first time they get "loose".
So gluing is the option...
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I'm sure the age of the wheel has some thing to do with it too.
If you do use glue, just give it a dot on the inside so you dont get glue all over the rim and face of the wheel, looks tacky when poeple get glue all over the face of the wheel.
Or you could put a rubber band between the rim and tire.
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I'm going to give a try to the rubber band first.
Thanks
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Let us know how it works out.
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So, I went for the a rubber band around the rim. Now the tires do not spin around the rim.
thanks for all the input.
Would be nice to have around the user from the previous forum with username "Gamester".
He did some incredible projects with the small cars!
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... Yes the motor you linked is the one I didn't want to tell you about ;) It's also sold under the name GWS 350. The motor is a current hog, sucking 10-12 amps. You need a 100-150watt speed controller. The brushes don't very long at 9.6V. It's a bit faster than the 280BB motor I linked above, but doesn't last nearly as long and is less efficient.
Know any thing about a "Rocket 400" 3-7.2vdc p/n 1086/1 ?
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Speed 400 motors are too big to fit.
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I think this 400 i have is a 380 can? Do any tyco's use 370's?
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Basically you can put in a motor that has a diameter of 24 mm.
A 370/380 can should do.
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Hi,
I uploaded a video of the Super Jet Hopper:
http://www.youtube.com/watch?v=u_dXWOOLmlo (http://www.youtube.com/watch?v=u_dXWOOLmlo)
Sorry for the quality...I'm not that familiar yet with video capture and processing.
Anyway, let me know what you think about the car speed.
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not bad. like to hear the car itself and not the music. if u were to guess, how far range can u get with your hopper? mine goes a long way. i will post a video tomorrow of my cars. looks like rain here all day. :-[
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I guess it is around 30/40 meters.
I was impressed to check the speed using the video in slow motion: it seems that in 1sec the little car is able to cover 10meters. Next time I'll use some markings at a precise distance and put the camera on a tripod and do the tests again.
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Look's fast just buy watching the video, least 20mph.
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another old clip. :D
http://www.youtube.com/watch?v=Vd96A9lOxUE