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XRAY - Model racing cars • View topic - xray nose dives on jumps

XRAY - Model racing cars

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 Post subject: xray nose dives on jumps
PostPosted: Wed Apr 09, 2008 06:59:40 
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Joined: Tue Oct 16, 2007 07:04:24
Posts: 46
Location: Seaside, ca USA
I have an electric XT8, and when I do jumps I find the nose will drop when in the air. I can control this, I just use the throttle to keep it level. My thought is that maybe I have too much weight in the front. I have the battery (5S Lipo) more in the middle on one side, well a little more in the back end. I'm thinking of moving the battery back some, but I wanted to see how it handles for others, using Gas or electric.

If I use smaller lipos, like 3S I have to keep WOT in order to keep it level, but with 5S, I don't need as much throttle.

Thanks!!


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PostPosted: Wed Apr 09, 2008 07:07:26 
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Joined: Thu Mar 20, 2008 06:49:55
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Location: IL USA
First check your ride height. Lower in front will tend to dive more. Try to level it out or have the front a little higher than the rear.


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PostPosted: Wed Apr 09, 2008 14:49:04 
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team driver
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PostPosted: Wed Apr 09, 2008 15:03:41 
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Joined: Thu Mar 02, 2006 17:15:17
Posts: 1442
Location: RC America
Jason is right, there is a lot of drag brake with those huge brushless motors that will make the nose dive off of a jump, just bump up the throttle trim until it barely starts to roll, or depending on your speed controller, there may be an adjustment.


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PostPosted: Wed Apr 09, 2008 16:17:01 
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Joined: Mon Aug 06, 2007 16:06:48
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Location: Redlands, California
Couldnt you mess with the rear shock wt oil?

I forget the rule of thumb but I think it was if your rear end kicks up then you increase the rear wt oil by 5-10wt and it should help.


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PostPosted: Wed Apr 09, 2008 23:25:23 
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 Post subject:
PostPosted: Thu Apr 10, 2008 00:08:23 
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Joined: Thu Mar 02, 2006 17:15:17
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Location: RC America


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 Post subject:
PostPosted: Thu Apr 10, 2008 05:19:11 
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Joined: Tue Oct 16, 2007 07:04:24
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Location: Seaside, ca USA
I will try the throttle trim

I did look at the truck and the front may be a little lower, do you think it is worth it?

If I do a long jump, and have the throttle on, the nose will still drop.

Here is my setup sheet:


Let me know if you have any setup suggestions.

Thanks again for the ideas.


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 Post subject:
PostPosted: Thu Apr 10, 2008 05:30:34 
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Joined: Tue Oct 16, 2007 07:04:24
Posts: 46
Location: Seaside, ca USA
Here is a pic, I actually do have the battery more in the back vs the front, but this image may not look like it is.


Last edited by NCALENDA on Fri Apr 11, 2008 06:23:56, edited 1 time in total.

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 Post subject:
PostPosted: Fri Apr 11, 2008 05:54:52 
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Joined: Sat Feb 23, 2008 06:25:30
Posts: 6
Location: MN
i have only jumped mine a few times and it seemed ok, let us know if you change anything on your set-up and if it helps

i have my battery in about the same spot

i am also in the process of adding mech. brakes to see how it does on hte track

not pretty like a nitro version but still fun(this actually broke a servo so i am re-doing the servo mount , and if it doesnt work then i have one more idea before going back to motor brakes)


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 Post subject: Re: xray nose dives on jumps
PostPosted: Fri Apr 11, 2008 06:50:24 
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Location: Texas


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 Post subject:
PostPosted: Fri Apr 11, 2008 17:12:06 
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Joined: Tue Oct 16, 2007 07:04:24
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Location: Seaside, ca USA


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