How to compare gasengine size to outrunner ?

[mohanjude]

Originally Posted by lincpimp

I can safely say that a 1521 will not be too happy trying to move a 20+ lb vehicle at 40+ mph.

Pimp

I second that. I tried the 1521 and it struggled to push my 22lb 2WD car. I think the 1527 will be ok. I have a Lehner 2280 and it shifted the FG brushless car ok. The Lehner 2250 which is the same size as the 1521 Neu had to work hard. As the Lehner 2280 is the same size as the Neu 1527 and the 1527 is muti pole motor it should have the torque to propel the car from standstill and still be geared for 50mph on 10S

Mohan

[speedy]

woud a kb45 xl motor make it ?i'd like the same preformance like the baja has with the stock 26cc engine !

Hobbycity sell a 100A hv esc for up to 12s lipo for like 120$ do you guy's think it woud work ?

[lincpimp]

Originally Posted by mohanjude

Pimp

I second that. I tried the 1521 and it struggled to push my 22lb 2WD car. I think the 1527 will be ok. I have a Lehner 2280 and it shifted the FG brushless car ok. The Lehner 2250 which is the same size as the 1521 Neu had to work hard. As the Lehner 2280 is the same size as the Neu 1527 and the 1527 is muti pole motor it should have the torque to propel the car from standstill and still be geared for 50mph on 10S

Mohan

My point exactly! You need a motor with plenty of torque to get a heavy vehicle rolling. A smaller motor geared down may do it, but will not be optimum.

[Oppressor]

you can't compare motors based on bhp ! i meen a .21 nitro engine can put out about 3bhp but they don't have the tq of an scooter 3bhp engine !

Peoples tried to rationalize why electric motors were so overwhelming in comparison to an nitro engine. The truth is that hp is still 750 watts no matter how you look and that torque should affect acceleration but for top speed that main culprit should be real hp and gearing.

The reason you can't it's because nitro engine in reality don't reach anywhere near the claimed hp. A 4 hp motors might in reality put 1.7-1.8 hp on a dyno!

i whan't to use an outrunner becasue thet are very cheap (65$ for a .200 size outrunner ) Compared to a lennher or neu for about 500-900$ :)

Once you will have paid for a controller able to run realibly your motors and the batts, 500$ motors won't look so expansive.

woud a kb45 xl motor make it ?i'd like the same preformance like the baja has with the stock 26cc engine !

Hobbycity sell a 100A hv esc for up to 12s lipo for like 120$ do you guy's think it woud work ?

The issue here is not having enough power or not as even an Feigao XL could push around a Baja5b around at 40-45 mph.

The issue is : "Will it cook doing it?"

Yes, a Kb45 will be able to push around a Baja 5b at 40+ mph but not for long(Read less than a run).

You are trying to push something that is twice as heavy as a e-maxx so i figure that a motor twice as massive than a neu 1515, lehner 1950, hacker b50/c50 or plettenberg big maxximum should do.

I would look at:
Neu 1527 or 2215
Lehner 2280 (2250 a bit on the tight side)
Hacker A60-L
Plettenberg Bolido

Also once you will have paid the battery and the controller to push around a Baja 5b, 300 to 500$ for an high-end brushless motors will look trivial.

For the neu 1521, i believe that it might work but it won't let you enough head room. Meaning you might be able to run on a cool day and cook it on another...

600+ grams brushless motors is a good beginnings for a 1/5 scale. High end brushless motors can sustain about double the power of cheaper one without cooking because they generate half as much heat by hp as they are twice as much efficients(90% vs 80% [Yes 10% is a world of diffrence!].

For the controller, it handle about as much power than a MMM (12s 100 amps is as much power than a 6s 200 amps controller).

Beside it's probably a "cheap" brand so i don't think that it would cut it.

1/5 conversion and cheap don't go hand in hand. Hell it's hard even for an 1/8...

[Ryu James]

Originally Posted by Oppressor

Peoples tried to rationalize why electric motors were so overwhelming in comparison to an nitro engine. The truth is that hp is still 750 watts no matter how you look and that torque should affect acceleration but for top speed that main culprit should be real hp and gearing.

The reason you can't it's because nitro engine in reality don't reach anywhere near the claimed hp. A 4 hp motors might in reality put 1.7-1.8 hp on a dyno!



Once you will have paid for a controller able to run realibly your motors and the batts, 500$ motors won't look so expansive.



The issue here is not having enough power or not as even an Feigao XL could push around a Baja5b around at 40-45 mph.

The issue is : "Will it cook doing it?"

Yes, a Kb45 will be able to push around a Baja 5b at 40+ mph but not for long(Read less than a run).

You are trying to push something that is twice as heavy as a e-maxx so i figure that a motor twice as massive than a neu 1515, lehner 1950, hacker b50/c50 or plettenberg big maxximum should do.

I would look at:
Neu 1527 or 2215
Lehner 2280 (2250 a bit on the tight side)
Hacker A60-L
Plettenberg Bolido

Also once you will have paid the battery and the controller to push around a Baja 5b, 300 to 500$ for an high-end brushless motors will look trivial.

For the neu 1521, i believe that it might work but it won't let you enough head room. Meaning you might be able to run on a cool day and cook it on another...

600+ grams brushless motors is a good beginnings for a 1/5 scale. High end brushless motors can sustain about double the power of cheaper one without cooking because they generate half as much heat by hp as they are twice as much efficients(90% vs 80% [Yes 10% is a world of diffrence!].

For the controller, it handle about as much power than a MMM (12s 100 amps is as much power than a 6s 200 amps controller).

Beside it's probably a "cheap" brand so i don't think that it would cut it.

1/5 conversion and cheap don't go hand in hand. Hell it's hard even for an 1/8...

OPpressor has nailed it on the head. 1/5 conversion and "budget" do not really go hand in hand. If you want to do the conversion right and actually SAVE yourself a lot of time and money then do it right the first time and use quality parts all the way around. That means something like the Neu 2215 or a Bolido and a MGM esc and ThunderPower Lipos. Those 3 items will put you in the $1500-$1800 range combined. Or you can cut corners and spend $500 and then have to come back and spend the $1800 anyway in a months time. Just my humble opinion. Plus, if you do it right you will be way pleased. Save up and buy one part at a time or something. Then build the baddest Baja anyone has seen.