Jump to content
  • Join our community

    Sign-up for free and join our friendly community to chat and share all things R/C!

New user guide to throttle management?


Martyn_T

Recommended Posts

Hi all,

 

Complete new user so have little experience of RC at all.

 

I have a Maverick Blackout XB (buggy) which has had a few teething difficulties.  The throttle servo broke within 10 minutes of first use so this has been replaced by the shop.  Then the muffler came loose - losing a bolt and the gasket.  I have replaced what was necessary (and cleaned up the vehicle and cover too - this was covered in oil and stuff from the exhaust). 

 

So the problem I have now is that the buggy throttle is a little open on when I start the engine.  I have tried using the trim but that isn't enough.  So then I attempted to take off the servo arm when the power to both buggy and Tx were on and re-align the arm in a 'neutral' position but somehow whenever I re-start the engine the servo seems to know I have tried to make a change and it leans the arm 'forward' a bit so the throttle is open a little - and the car creeps forward. 

 

It is back in the garage right now because I am not sure it will be doing the servos/brakes/car any good for it to be always chomping at the bit.  Additionally I am concerned that if there is a loss of communications and the brakes fail then the car is just going to shoot off into the sunset. 

 

Is there a guide on here to explain how to set the throttle so that it doesn't race all the time?  I have read about altering the pins etc but haven't touched them - and in any case it seems to be the throttle arm itself and not the carb settings.

 

(I did wonder if it was due to the back pressure from the muffler/tailpipe but these are all standard - and fitted - so can't think it is this).  Any advice please?

 

Finally, please make any answers simple for a newb to understand.  ;-)

 

Thanks,

 

Martyn.

Link to comment
Share on other sites

Thanks for the quick reply SSS,

 

Is that (end points) different to the Trim? On my transmitter it has the Throttle trim and Throttle dual rate.  I tried pulling back on the 'trim' but there is not enough play for it to do that. 

 

The dual rate seems to alter the 'gain' of the throttle but I must admit I didn't think to alter that. 

 

It is all standard equipment (Tx/Rx) that came with the Maverick.

Link to comment
Share on other sites

You need to adjust the collets on the throttle rod.

 

mv12402_02_zps3b471172.jpg

 

Turn radio gear and car electrics on and undo the grub screw in the colloet. this will let the spring on the carb fully close it.

The just tighten the grub screw back up with the collet pressed against the servo arm with out moving the throttle rod

  • Like 1
Link to comment
Share on other sites

Rover Man,

 

Thanks for this.  I'll give it a try tomorrow evening. That does make sense.  I didn't want to start messing about with any settings without getting advice first but I will give this a go tomorrow. 

 

Thanks to you both for the replies.

 

Martyn

Link to comment
Share on other sites

  • 2 weeks later...

Thought I would send an update on this in case anyone has the same problem again. 

 

The problem was the plastic servo arm had lost all its splines - they had torn off due to the power of the servo I guess.  The metal teeth on the gear wheel must have chewed through the plastic.  So it would push forwardsd to throttle but then slid inside the arm. Therefore the arm never returned to a neutral position.  It also meant that the brakes weren't being fully applied. 

 

I have replaced with a new plastic arm and have an aluminium on its way which I will replace when the plastic one finally gives up the ghost - or maybe straightaway if I can be bothered with swapping it all around. 

 

Thanks for help though - hopefully this post might help others in the future.

Link to comment
Share on other sites

Thought I would send an update on this in case anyone has the same problem again. 

 

The problem was the plastic servo arm had lost all its splines - they had torn off due to the power of the servo I guess.  The metal teeth on the gear wheel must have chewed through the plastic.  So it would push forwardsd to throttle but then slid inside the arm. Therefore the arm never returned to a neutral position.  It also meant that the brakes weren't being fully applied. 

 

I have replaced with a new plastic arm and have an aluminium on its way which I will replace when the plastic one finally gives up the ghost - or maybe straightaway if I can be bothered with swapping it all around. 

 

Thanks for help though - hopefully this post might help others in the future.

 

 

if you have a alloy arm coming fit it straight away as you could do damage to the servo or the car if you leave the plastic one on 

Link to comment
Share on other sites

You might want to check your end points, sounds to me like horn under too much strain due

to try moving farther than linkage would allow.

I run metal gear servo with plastic horn no problems

  • Like 1
Link to comment
Share on other sites

You might want to check your end points, sounds to me like horn under too much strain due

to try moving farther than linkage would allow.

I run metal gear servo with plastic horn no problems

 

I think this is exactly what the problem was.  I just used about 1000 words to describe what you did in one sentence. 

 

I am actually still tinkering with this because the brake linkage (I think) needs attention.  It is needing adjustment so I am thinking instead of both throttle and brake linkages been on the outer most (furthest from gear servo) hole of the arm, that one needs to moved in to 'balance' it.

 

When I brake initially it is OK but then the collet on the brake linkage is being pushed up. So next time no brakes.  So it needs more attention definitely. 

 

At least the blooming car is running now... that's a bonus for me to be honest. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...