Brushless Jammin CRT Project - Page 2 - RC-Monster Forums

02.25.2006, 09:26 PM

why such a huge motor? The 2250 is $400? How big is a jammmin CRT?

squeeforever · 02.25.2006, 09:37 PM

jammins have about a 17" wheelbase. i think...

stampy · 02.25.2006, 11:15 PM

Quote:

Originally Posted by squeeforever

jammins have about a 17" wheelbase. i think...

nop its 14.5 :)

02.25.2006, 11:20 PM

so why a 2250 when you can buy a 9xl or something like that for $340 less??

squeeforever · 02.26.2006, 12:25 AM

Quote:

Originally Posted by stampy

nop its 14.5 :)

i meant over all length, not wheelbase:013:

02.26.2006, 01:38 AM

so why not a 2280 high amp?

nl12 · 02.27.2006, 06:47 AM

Quote:

Originally Posted by Superemaxx89

so why not a 2280 high amp?

Too long to mount easily, I would need a mount that was extremly strong, even then it may flex and strip gears, and what do you upgrade to when you start tearing up 1/8 diffs?:027:

coolhandcountry · 02.25.2006, 11:18 PM

Hey that is about your length stampy.

stampy · 02.25.2006, 11:25 PM

cool: ya pretty close about mines about .25 longer
super: the 2250 is more powerfull and smoother than the xl motors

coolhandcountry · 02.25.2006, 11:39 PM

Well super it is like why get a 1950 when you get a xl either. It comes down to the quality. The 1950 is smoother and more powerful than the xl motors. The 2250 is just a plan power house. Yes it is some money to pay for a motor. I have one and it is worth the money. I love it.

Serum · 02.26.2006, 04:16 AM

Because it's not a go-cart that needs to be powered....

Gustav · 08:53 AM

i think they end up only around 4kg RTR.The question is how fast do you want to go?i think 50mph is fast for an off-road truck but some people need more.
Also is lightweight and handling more important or big power and straightline speed.
For a racier 40mph setup i'd take a 1940,mount it above the spur in the centre and move the batteries closer to the centre line to lower the yaw moment.i think that would be the best handling.
For heavier motors,i'd mount it low beside the spur,due to the weight of the motor.
A 1950 would do mid 50s i would think,beyond that the 2240.

I'd be a little cautious about the alloy bevel shafts in the Jammin,i guess any BL motor will test these though.
Edit;nl12,since you have access to a machine shop it would be easy to run off a set of steel bevel gear shafts on a lathe if the alloy ones become a problem.

nl12 · 08:28 AM

I would be satisfied with about 60 mph, I dont think I would actually go 60 mph often, I just want crazy acceleration whenever I lay into the throttle. Big power and speed is more important to me but I want to be able to put that power to the ground, thats why I chose the crt, less rolls wheelies and flips than the emaxx.

http://www.amainhobbies.com/images/large/ofn30774.jpg
are these the shafts you are talking about? These are the optional ones, they are alloy, I beleve the stock are steel, I am not certain. I may try to find them in titanium or get some made in tool steel if they are a problem.

Quote:

Originally Posted by Gustav

i think they end up only around 4kg RTR.The question is how fast do you want to go?i think 50mph is fast for an off-road truck but some people need more.
Also is lightweight and handling more important or big power and straightline speed.
For a racier 40mph setup i'd take a 1940,mount it above the spur in the centre and move the batteries closer to the centre line to lower the yaw moment.i think that would be the best handling.
For heavier motors,i'd mount it low beside the spur,due to the weight of the motor.
A 1950 would do mid 50s i would think,beyond that the 2240.

I'd be a little cautious about the alloy bevel shafts in the Jammin,i guess any BL motor will test these though.
Edit;nl12,since you have access to a machine shop it would be easy to run off a set of steel bevel gear shafts on a lathe if the alloy ones become a problem.

Gustav · 10:17 AM

Yeah those are the shafts,actually they look pretty strong,4mm and hard anodised,i thought they come stock,not sure.They should be fine really,though no transmission part is ever really safe with a 22 series around.:027:

Edit;going to 8s would only add about 200g and add 1cm ish to the pack height and bring the amps down.A 2240/11 or 12 on 8s would run 60mph with ease and run cool with long runtimes.i'd aim for between 35000 and 38000 max rpm.

coolhandcountry · 02.26.2006, 08:57 AM

The 2280 would be nice if you planning to ride it to. The 2250 is more power than a rc can handle. The motor turns whether truck moves or not. I have ripped the teeth off a couple spurs now. I put better tires on and the problem has got worse. I am trying to put a stronger mount in truck and go from there.