Big wheels on a heavyweight

[craig_colliass]

Big wheels on a heavyweight

So Robotec speed controllers are better!
How much are they for my project? (24-36 volt, 2* Bosch750 from 18Ah SLA batteries.) Would a watty be better? Were do I get these from?

[maddox]

Big wheels on a heavyweight

Roboteq controlers are a lot more expensive, larger, heavier and to fancy compared to the bare bones, but small, light and easy to use Sidewinder.

The Wotty is in between on pricetag, but suffers from the voltage limit of 30 volt and the lack of housing.

And it seems Team RCC doesnt suffer from a lot of Sidewinder blow ups. The first one we had was a combination of 2 things. The single channel current limiting and a Litton/T axle drive unit that was worn out and failed- jamming the windings between the magnets.

The other one a human mistake, dont try to charge your sidewinder. Now rectified by using a fool proof charge plug/seperate removable link set-up.

The single channel limiting is solved by Robotpower.

[john]

Big wheels on a heavyweight

if you deal with roboteq and not the shops then i think you may get them cheaper - i think you can get like repaired ones cheaper but when repaired my dad doesnt think there anywhere near as good as brand new

my dad started dealing with roboteq after having so many blow up for various reasons - he sorted all that and then tib went straight through a motor lol

but as jonno said the roboteq seems to make the robot alot faster then with the same setup on the sidewinder - i noticed this at uk champs as in the fight vs big nipper i just couldnt get over to them fast enough and this made me lose the fight :sad:

there is a weight difference but when building a heavy it doesnt matter you can easily build around it and its not that much heavier

[maddox]

Big wheels on a heavyweight

To me, TAN doesnt look any slower after the conversion to a Sidewinder.
Neither did it show in Hannibal or Obsidian after their conversion.

But that can because the Sidewinder likes to calibrated to the receiver its being commanded from.

[john]

Big wheels on a heavyweight

my dad doesnt read manuals so thats prob the problem his support is jonnos mobile and i doubt he reads manuals either ! lol

[robotwars]

Big wheels on a heavyweight

stu is my manual when it comes to side winders, so we need to ask him if he read it ?

Stu ????

[tom_kane]

Big wheels on a heavyweight

Is in America, bet he didnt read it though, he played sims instead!

[leorcc]

Big wheels on a heavyweight

Well for me there are too many people claiming that their robot is significantly slower after building in a Sidewinder to dismiss it as a user error.

I am very happy with my Sidewinders, and use them as default in all my heavies. But if there are so many people that dont agree, there must be something more to it. Id like to hear from James or Chris about this.

[john]

Big wheels on a heavyweight

well it was at the uk champs that i noticed it was slow

last few events it has seemed up to speed just flipper hasnt been working but hopefully can sort that soon

we have been using the very old sidewinder out of big cheese since november - waiting for a new one

[psycho_fling]

Big wheels on a heavyweight

i thought stu was in paris at the moment, and going to folrida in may?

[chrisbaron]

Big wheels on a heavyweight

Hi All,

Now that Im approved for this forum I thought I would weigh in on this discussion and answer a few of the points:

1) 36V and Bosch 750s.This is a maximal combination for the Sidewinder.The motors will draw a lot of current if stalled or jammed and when stalled the Sidewinder current limiter works least well.I would recommend gearing low enough so that the wheels will not stall but will spin in all cases or better yet stay with 24V.

2) Sidewinder vs Roboteq vs Watty.Obviously we think the Sidewinder is a decent controller.VAlue for the money is something you decide.

3) Sidewinder slower than xxx controller.Hmmm.I dont think a properly calibrated Sidewinder will spin a motor noticeably slower than any other ESC.It does reduce the absolute output voltage slightly 5% over the input voltage.This is because the Sidewinder does not go to 100% on, it always pulses.This is because of the current limiting scheme.So at full throttle youll get more than 95% of full voltage.If the unit is not properly calibrated to the radio it is possible that it wont reach full power at full stick.This could make it seem to be running slower.Same speed at 36V as 24V with yyy no this is not possible with a properly working unit.

4) Service speed.Yes service is slow.Too damn slow.We have lost our service guy and havent been successful at getting a UK service outfit yet.No excuses. We get them turned around as quickly as we can.

Unfortunately I cant follow this forum day to day so if there is an item of interest or a question on our stuff please someone send me an e-mail ping and Ill address it.chris@robotpower.com

Chris Baron
Robot Power

[robotwars]

Big wheels on a heavyweight

Hi chris,

Glad your finally on the forum.

Im going to try and calibrate my new one properly when i get it, if thats where im going wrong.

John

[beast]

Big wheels on a heavyweight

yes ditto John but i see it takes 3 days for you and i am still waiting 4 months now

dibolical is all i can say

[craig_colliass]

Big wheels on a heavyweight

The Big wheels project at the moment, is on My profile. it is going well hope to have something ready for the champs!!

[beast]

Big wheels on a heavyweight

NOW THEY R BIG