RC-Monster Forums

RC-Monster Forums (https://www.rc-monster.com/forum/index.php)
-   Brushless (https://www.rc-monster.com/forum/forumdisplay.php?f=12)
-   -   New hi-speed project (https://www.rc-monster.com/forum/showthread.php?t=9183)

JERRY2KONE 04.22.2008 09:25 AM

These
 
I would guess you need something like the Thunderpower 10S/5K/V2 packs with 25C continuous, and 50C burst output, for $549 a piece. WOW that is some power, but at a huge price. The chassis is looking good BG. It does look kind of freaky being so wide, but with the right aerodynamics and some down force wings installed that thing should move pretty quickly and hopefully stay on the ground. It will probably do very well if you can get some ground skirting to keep the air out from under the vehicle. Good work BG and good luck.

aqwut 04.22.2008 01:14 PM

Do 12S Brian... . go go go.... 12S1P 6000mAH 25C would be just Wicked...

lutach 04.22.2008 02:16 PM

Kong Power and Air Thunder are somewhat cheap compared to TP and FT. You can even use the small capacity packs and I can assure you they will deliver 120A spikes when needed. I have proof :lol:.

BrianG 04.22.2008 02:26 PM

lol, 12s is a bit much. I test-fitted two of my 14-cell NiMH packs for weight/size, and it's a bit unbalanced. And I would need to dial in tons of shock preload. 28 NiMH cells is roughly the same weight as a 12s/5Ah pack weight-wise. Besides, that would be spinning my 1515 Neu to over 73k rpm! :oh:

As far as lipo price, I would need 10s @ ~5Ah, which would be ~$600. But I have ideas to keep it well under $600.

Arct1k 04.22.2008 03:13 PM

How about moving the brake servo to the other side?

BrianG 04.22.2008 03:31 PM

Yes, that would work, but still have the issue about the weight and over-revving of the motor. Besides, I don't wanna make yet another servo tray. :smile:

lutach 04.22.2008 03:35 PM

Quote:

Originally Posted by BrianG (Post 165366)
lol, 12s is a bit much. I test-fitted two of my 14-cell NiMH packs for weight/size, and it's a bit unbalanced. And I would need to dial in tons of shock preload. 28 NiMH cells is roughly the same weight as a 12s/5Ah pack weight-wise. Besides, that would be spinning my 1515 Neu to over 73k rpm! :oh:

As far as lipo price, I would need 10s @ ~5Ah, which would be ~$600. But I have ideas to keep it well under $600.

Brian, I totally forgot about the motor you're using. My fault. If you are really going to try and make it to 100mph and if you ever do get 12S lipos, I'll be more than happy to lend you my 1521/1.5Y, but you must return it as soon as you are done :yes:.

BrianG 04.22.2008 03:39 PM

I'll keep that in mind... IF I ever get this done and IF the car survives the first few runs. :smile:

But, you really must more clearly define "you must return it as soon as you are done", because "when I'm done" could be a very, very, very long time. :wink:

lincpimp 04.22.2008 04:02 PM

Quote:

Originally Posted by BrianG (Post 165231)
I just quickly checked a Revo shock. A fully compressed Revo shock is the same length as a front GTP shock at about half travel. When the GTP shock is fully compressed, the Revo one would bottom out and then some. You'd need to fab a new front tower to use the Revo shocks.

The back is about 40-50% longer than a Revo shock, so that won't work either without mods.

I guess that I will fab up some top mounts that will place the shock in the correct location. I want a bit of downtravel, I will setup the car to ride with the driveshafts parallel with the ground. At least this way I can retain the stock shock tower and just add a mount... hope it is that easy!

lutach 04.22.2008 04:35 PM

Quote:

Originally Posted by BrianG (Post 165383)
I'll keep that in mind... IF I ever get this done and IF the car survives the first few runs. :smile:

But, you really must more clearly define "you must return it as soon as you are done", because "when I'm done" could be a very, very, very long time. :wink:

I meant to say when you are done with the speed runs :lol:. You will survive the first few runs for sure. Those 1/8 scale cars are tough.

jzemaxx 04.22.2008 10:55 PM

Looks awesome. What rpm are you shooting for to turn the motor?? What KV is that 1515?

BrianG 04.23.2008 12:19 AM

Thanks!

Kv=1700. Running 10s, rpms are ~62k, but the amp draw will lower the kv and the drag won't let the motor spin that fast, so I am thinking it will actually only be going ~57k.

jzemaxx 04.23.2008 12:22 AM

That will be plenty of RPM's then.

BrianG 05.02.2008 02:27 PM

Does anyone use a Spektrum DX3/3.0 and HV-110 in your setup?

I'm curious how to set up the controller and radio so they work together; things like EPA, trim, etc. I got CH3 mixing for the rbake working on my setup, but the ESC does not want to arm. I have the ESC set to auto-range on startup, but no-go. I can also get into programming via the radio (just to test the radio), but cannot change settings. So, I assume the ESC is not seeing the low throttle point. I'm trying to think of how an air radio would work and emulate that, but that's obviously not working.

I currently have the forward EPA set to 125%, and the reverse EPA set to 0. Trim is at the default 0. TBH, I didn't spend too much time trying this, but wanted to get a test run with 28 Ni cells just to see.

jzemaxx 05.02.2008 02:31 PM

I have the 2.0 which is the same.....I had to use the pix stix convertor. Works like a champ after that.


All times are GMT -4. The time now is 02:57 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.