Decent motors

i know this is a broad question and it is probably a mater of opinion but, the next feather i build way in the distance it is i want to really fast and have lots of pshing power

so what is the best motor, or motor setup?

thanks alex

Depends how deep your pockets are :)

Probably Astroflights onto 4 wheel drive would be the best option for lots of speed/pushing power but also the most expensive by the time you consider a suitable speed controller and batteries capable of supplying the necessary current.

Next to that, a pair of gold motors driving either 2WD or 4WD would be a much less expensive option, as you could still use the likes of Electronize controllers to control it. One that springs to mind is Batterbot - it seems to have a good mix of power and speed running golds through 2WD so thats certainly a viable option.

After my exams Im gonna be trialling a system for a fast featherweight pusher using the Bosch 400 motors that were on eBay. Its slightly copying Shanes idea of using the 400s in a feather but instead of running direct drive to the wheels (which is what he has in mind), Im planning on driving my wheels through friction from the motor output shaft to add a bit of speed reduction. I have absolutely no idea if it will work or not as I havent calculated anything for it yet, but I hope it will :)

EDIT: I dont suppose anyone knows a rough figure for rpm of a Bosch 400 on 12V?

(Message edited by K_C_R on May 09, 2007)

Take a look at Graupner speed 900BB torque. Bonx uses these as well as I do, and with a single stage gear ratio of 5:1 @ 24v it will slam any feather into a wall.

I agree with Leo. I use astros, and they are very tempremental. Before you find all the little things to keep them reliable youve burnt out a couple in the process.
Depending on your money, Mag motors could be a possible solution - they are used in the featherweight BattleKits. Tony Booth uses EV Warriors for drive, and that works reliably too.

Bosch 400 @12V will do about 3300 rpm, and will have 400W nominal power.

Tony Booth uses EV Warriors for drive, and that works reliably too.

Not any more, think he snapped his 2nd EV Warrior shaft last weekend.

Mr Stu

I like the sound of using astroflights. :)

But do you like the sound of paying for them? :wink:

Not any more, think he snapped his 2nd EV Warrior shaft last weekend.

Lol, yeah I was gonna mention that too - was in the first fight of the weekend as well which was supposed to be a demo fight - extremely unlucky

quote:

But do you like the sound of paying for them? :wink:

If I can get enough money I think I can wrangle them. Ill have to wait until I come up with a new design though. :wink:

any sites for these graupners?

cheers alex

http://www.google.co.uk/search?hl=en&q=speed+900BB+&meta=http://www.google.co.uk/search?hl=en...d+900BB+&meta=

Hmm...Ive had a look on Google and not many pages have astroflights...but these graupners sound pretty good too. Ill do my research on them.

Does anybody have a link to astroflights that can be used in a feather?

I would go for 12v gold motors with a chain and sprocket drivetrain.

You can use electronize as said earlier and you only need a single 12v battery. Remember that more powerful motors require not just bigger speed controllers but bigger higher quality batteries.

From what I have heard astroflight are a pain in the proverbial to deal with.

hey kody, you are in Canada right?
http://www.teamwhyachi.comwww.teamwhyachi.com
TWR18 with whyachi wheels.
perfect for what you are wanting, less powerful than astros, but very nice still.
cheers

Dewalts IMHO are a much better motor in terms of price and performance.

Why pay USD$160 for an Astroflight motor (no gearbox etc etc) when you can pay USD$165 for a Team Delta 18v Dewalt kit with motor, gearbox (2 speed), CNC mounts and output shaft.

The Dewalts have a great range of spares from easy to access places like Dewalts Service and Part or the Robot Market Place. IIRC, Astroflight 940 motors are no longer available in combat models (They still make boat/plane ones I think) and you have to make your own custom gearbox which is even more money...

Weve had some very sucessful rambots here in Australia using Dewalts.

Singularity - 4 x 18v Dewalts on 18v with 5 wheels - http://www.youtube.com/watch?v=MbNm2TOE91whttp://www.youtube.com/watch?v=MbNm2TOE91w - http://www.youtube.com/watch?v=7qnXrhRG_Rshttp://www.youtube.com/watch?v=7qnXrhRG_Rs

King Cobra - 2 x 18v Dewalts on 24v with 3 wheels - http://www.youtube.com/watch?v=L1MD1gDEXLQhttp://www.youtube.com/watch?v=L1MD1gDEXLQ - http://www.youtube.com/watch?v=eLvU4IQIbw0http://www.youtube.com/watch?v=eLvU4IQIbw0

Eleanor - 2 x 18v Dewalts on 23.6v (7 cell A123 pack) with 3 wheels - http://www.youtube.com/watch?v=UkatXUaz5uchttp://www.youtube.com/watch?v=UkatXUaz5uc - http://www.youtube.com/watch?v=BRxC06xtGyohttp://www.youtube.com/watch?v=BRxC06xtGyo

Just my 2c :proud:

I use Astros for the weight. They are very light for the power they give out, and i dont have enough weight spare for anything heavier.
Astroflight 940 motors are no longer available in combat models????
They are still astroflights main industrial motors. I just bought another batch a couple of weeks ago.

are these any good?

http://www.battlekits.com/battle_kits_order.htmhttp://www.battlekits.com/battle_kits_order.htm

and is the $149 price for both sides?

alex

James, I like the TWRs. They seem really good for the type of bot I want. :)

alexander I cant comment on quality however I believe it to be high but you have to buy the $149 is for a single side module and then you have to buy your motors on top of that. So if you were to go for two along with two s28-150 magmotors (as an example) then it would cost $298 for the modules plus $598 for the two motors plus shipping and probably plus VAT when it arrives of 17.5%

Not as cheap as it first appears!

$300 for 2 sides, plus $160 for his econemy motors, is about £250, plus import shipping and any VAT etc, it is easily £300-£350....

but then thats still not bad for a full drive setup.

Id say use 2 TWR18s, or for more power, use 4

I think that James is right there, 4 TWRs are pleeeeeeeeeenty for a feather who needs tons of power. :)

But I think Ill take 2 (when I can get em). I dont need that much of a rammer, just a flipper, and some pushability. :)

just make sure you get the matching wheels Kody, they are really good bits of kit

They have pretty good quality rubber, so yeah, they are a good choice. But Ill have to come up with a body design for my feather, a design that makes good use of those wheels.

The same setup als Bonx and Hannibalito 2 cost us roughly 120 euros including motors. Thats 80 British Pounds.

And people who have seen Bonx in action cant say it is lacking power.

Technobots Feather Gold 24V 150W

would that do for a good runner?

they are very nice little motors. Gear them correctly and you will have a very nice featherweight drive.

how do you gear a motor? this is probably a rookie question but i have never had to do it!

alex

With gears :crazy:

Spur gears, chains and sprockets, timing belts - whatever method you prefer. Youre most likely to have seen drive systems gearing down the speed of the motors at the events youve been to.

Off-hand examples:
Chains and sprockets - DB5
Spur gears - Batterbot
Timing belts and pulleys - Pillow Torque, Pain in the Asp.

Theyre all effective methods of gearing the motor so that the drive has enough torque to power your featherweight. Obviously the speed and amount of power your featherweight can produce depends on the ratios used with the gears, sprockets, pulleys etc

BonX uses spur gears, single stage 1:6 reduction speed 900, 23 mph and enough power to sit on and drive around.

quote:

how do you gear a motor? this is probably a rookie question but i have never had to do it!

Alex, Jamies post above is really useful, I must say. :)

Jamie,

Pain In The Asp is a real hybrid of drive systems,
First, Astroflight C40 motors driving through a Team Whyachi TWA40 3 stage gearbox @ 7.78:1 then a set of Mod 1.25HD spur gears @ 2.2:1to the rear axel (overall ratio 17.11:1)
From rear axel to center and front axels I use 2 sets of 5mm pitch X 15mm wide HTD timing belts and pullies @1:1

Not light, but incredibly strong and reliable.

And bent axel shafts :crazy:

Mr Stu

I would like to see you try to bend the new ones! :wink:

Good point actually Geoff, I remembered the Astros went through the gearboxes first but forgot that you used spur gears to take the drive to the rear wheels. Timing belts were the most obvious parts to see in pictures etc which is probably why I forgot about the rest! :)

Still, it is a very sexy 6WD machine...........when its got all six wheels attached that is :wink:

thats been sorted.
today in fact :)

if i were to go for the chains and sprockets, what size stuff would i need?

alex

Alex I use the 6mm pitch chain and sprockets from Technobots. Have a look at DB5 next time you get a chance, I use a mix of spur gears and chains.