X2 is back

I have been working on some changes for the X2 while I have been testing the X3. This past Saturday, I tested some new wheels. These wheels were taken from the OFNA Ultra GTP and I modified them to accept 1/10 scale clamping hubs. Then I trued the tires down to 3.5" in diameter from 4".

Here are some videos of the X2 doing some low speed passes from this Saturdays testing:




Some people have mentioned to me the reason why I have been blowing up tires is from all the sprung weight of the motor within the suspension. I do agree with this. But I have to wonder if the problem is still the design of the car, or a problem with the tires. If you take a look at Nic Case's prototype from last year, you can see that neither the front end or rear end has suspension:


Nic was supposedly able to reach 130mph with this car and his wheels are half the diameter of my tires. So it seems like the tires aren't the limiting factor in these high speed r/c cars. I will still be working on the X2 as my main car for the high speed event, but the X3 will be a backup. I will be doing some more testing with different tires and I will post my progress here.

The International R/C Speed Challenge - presented by Castle

International R/C Speed Challenge-Presented by Castle
Is happening this year Oct 4th @ the Birthplace of Nascar
We will use ROSSA rules & DUAL Optical Speed traps.
There are plenty of classes for everyone
How Fast is your car? – Prove it to the World
Rockingham Dragway is a First Class facility.- Billy Weeks is the race director
*******Extreme R/C & R/C Driver will be covering the event!*******
---other magazines welcome---

The "International Speed Cup" is for the over-all fastest speed in the world! It’s a perpetual Award---(Similar to a Stanley Cup)------ Starting at the UK event ------ and if us Americans can TOP the Britt's speed------ the "International Speed Cup" comes to the United States!---
only the fastest driver in the world will ever possess the “Cup”

There will be a 100 mph club -----You will receive a special embroidered hat for everyone that breaks the century mark!

This event qualifies for the Guinness Book of World Records.

Be a part of History; feel the need--- the NEED FOR SPEED!

Entry Form

R/C Speed Challenge 2008 Officially announced! October 4th at Rockinham N.C. - Sponsored by Castle Creations

The 2008 R/C Speed Challenge has been officially announced. It will be hosted at Rockingham Dragway in North Carolina October 4th 2008. It is sponsored by Castle Creations. Click the Castle logo above to get more information about the event. Details are still being ironed out, but the event will happen this year.

This is what Nic Case said about the event:

Hi Guys

Yes-- the cat is out of the bag.......We will have a speed run in the United States-- on Oct 4th!
We will use ROSSA rules & an Optical Speed trap. This is going to be a blast!
I understand North Carolina is very nice in Oct.
We have a lot of support from sponsors. Thanks to Billy Weeks for handling the race director/Promoter duties...

Special thanks to Tony Lovering (aka AJ/ziggy 12345) for having this site & being the founder of ROSSA...!

R/C Driver has committed to a 2 page article
Extreme R/C is interested

We will have an "International Cup" for the over-all fastest speed ---- Starting at the UK event –
-- and if us Americans can beat the Britt's speed--------- the "International Cup" comes to the USA!

There will be a 100 mph club ------- A special embroidered hat for everyone that breaks the century mark.

We are in the process of getting the details for the "Flyer"------ so, stay tuned.

Speed is Cool
N

More information can be found here.

Testing results from 7-12-08. 83 mph. Motor problems

What the motor should look like

After doing some high speed runs. The motor endbell has slid off.

This post is a week late since I've been pretty busy lately. But I wasn't able to get any faster than 83mph. I made some changes since the last testing session. I removed all the data logging equipment, I modified the body and I removed the heavy stainless steel gear and replaced it with a lightweight delrin gear.

After doing the last pass of the test session, I noticed the power of the motor decreasing. I removed the body and I took a look at the motor and I noticed the end of the can was sliding off. It came loose during the runs. You can see this in the second picture of the motor. It has come off about 5mm from where it should be. Neu Motors has addressed this problem with their newer motors and has secured the endbell with screws like the motor below (the pic is a Neu 1515 but I will need this on my 2215):


I am going to have to send the motor back to Neu to get it repaired. I think this is the problem with not being able to get a higher speed. I should be able to reach at least 90 mph on 8s.

No testing this past weekend

Latest pics of the X3. We didn't get a chance to do some speed runs. We got kicked out of the parking lot area before we could get setup.

I've made some modifications since the last testing session. I removed the data logging equipment and switched to a 2s 800 mAh li-po receiver battery from the heavy 1400 mAh ni-mh pack. I think I took off about a pound of extra gear. I also changed the old stainless steel gear for the delrin gear. This delrin gear is about 1/3 the weight of the stainless steel.

We're still looking for some more room to run. The X3 is ready for a 100% full throttle pass. Its been trimmed as much as it can get for now. We might have to go back to the usual testing spot and what speeds we can get there.


In the parking lot trying to get a run in before we get kicked out. Here is (L to R) Trey with his Rustler, Sunny with his Rustler and my X3 in front


Latest iteration of the X3. All data logging equipment removed and ready for a 100% full throttle pass. Just need some more room to run


New lightweight delrin gear replacing the heavy stainless steel gear


Worn out stainless steel gear