Grasshopper 2 receiver and msc

[sub_sea]

the servo on the msc keeps pusching it over the plate so at full throttle it just stops but work in reverse throttle. have tried all i have to set it up to run in both directions but nothing i do works, HELP?

the acoms receiver i have with it uses AS-7 servos. is the anyway of changing them servos to AS-12 without changing receiver?

[Live Steam Mad]

Hello there!,

4 things immediately spring to mind ;-

1) Servo travel is normally 94 degrees approx on my analogue radio sets going from e.g. full forward throttle to full reverse throttle, i.e. 47 degrees of servo throw either side of neutral, but you can translate this into a longer or shorter amount of linear travel by varying the length of the servo arm (i.e. try a different plastic servo output arm with holes that are spaced either further out or further in than on your MSC's servo at present), and,

2) on Transmitters with ATV you can vary the amount of servo travel, and also, on one of my computer transmitters, the Futaba Field Force 6X, the ATV set to 100 per cent travel only translates to 40 degrees either side of neutral (80 degrees total) [well, it is on channels 1 to 4, it's 55 degrees either side of neutral (110 degrees total) on channels 5 and 6] and, you can also set it to more than 100 per cent ATV and get e.g. 120 per cent ATV which gives you 50 degrees travel either side of neutral for channels 1 to 4, which is 100 degrees total travel, and for channels 5 and 6 it becomes 60 degrees travel either side of neutral which is 120 degrees total travel... and,

3) the obvious thing is to make sure your MSC servo is at neutral (i.e. Transmitter throttle trim is at neutral) before you fit the output arm to the MSC onto this servo, and make sure that whilst you are doing this the TX and RX stay switched on (but switch off the RX first before doing up the screw on the MSC servo / output arm otherwise the servo may be overloaded) and whilst you are doing this make sure that the servo output rod going to the MSC is the right length for the MSC to make correct contacts at full forward and reverse throttle.

4) The throttle trim on the Transmitter adjusts where the MSC wiper arm goes over the speed controller contacts for full forward and full reverse throttle adjustment...

5) You don't normally have to change servos unless e.g. a) the steering needs a higher torque servo (monster trucks), or you have a Futaba S3003/3004 and they have changed the **** mounting holes and they no longer fit our cars!!

It takes a bit of fiddling around and a few minutes' work, but it should be quite easy, at least it was on all the standard Tamiya MSC's that I ever had on my cars.

Other than that I'll have to have another think about it.

Anyone else want to help?

Cheers,

Alistair G.

[sub_sea]

Thanks for the help mate. problem now sorted. the arm off the servo was one hole to long, i couldn't see it for looking. sometimes i can be so blind

[mymonsterbeetleisbroken]

lining up the servo with the msc to make the controller work perfectly isnt as easy as it looks, and can also depend on the model itself!

my clod busters msc has never given me trouble, no matter how many times ive taken it to bits to clean it, every time ive put it back together its always lined up an moved perfectly. but it took me litrally ages of messing about to get my midnight pumpkins throttle servo to line up perfectly with the msc!

ive alwas found you limit the travel perfectly in both directions, but then the msc decides not to stay in neutral and the truck drives itself forward when you want it to stop!

of corse the key to solving these problems is simple - buy an electronic speed controller! but i just havent felt like taking the plunge and buying a few esc's for my runners, plus i kinda like the way you can see an msc working. and a few of my old mscs also had the intresting capability of catching fire - nice [8D]