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-   -   ***__ The 1/8 Onroad Think-tank __*** (https://www.rc-monster.com/forum/showthread.php?t=9298)

mabu 01.26.2009 04:52 AM

yes, the motor mount is the speedpassion conversion set.

my configuration will be about 35.000rpm - that would be 5s Lipo or 6s Fepo with the neu.

strodedawg 01.26.2009 09:53 AM

does this motor mount fit anyother chassis in the serpent line? how about the mugens?
thanks

mabu 01.26.2009 10:03 AM

well, it fits in 950 and 960 ... because its developed for serpent, i guess it only fits serpent line - and which chassis i do not know ..may be you get some information at speedpassion.

strodedawg 01.26.2009 11:01 AM

i can get a 950r cheap, that is why i asked sweet! for my 1/8 offroads i try to keep the rpm between 35-37k max. for onroad, since there is no jumps and usually level ground can we up the rpms to around 40k? i would like to run an 8s pack and a 1300 kv motor, what capacity are we looking at 3000? or do i need more?
thanks

mabu 01.26.2009 12:05 PM

i am running a 1515 3d on 6 to 10s Fepo in a 1:8 Xray Buggy and get peaks on maximal 50 amps ( i am using a jazz 55-10-32 ).

so i think you can expect similar ampere here. i did not run my conversion until now because i have to replace the steering arm first :whistle:

samwong 02.15.2009 10:19 PM

Also join the 960 Brushless party
 
1 Attachment(s)
The only problem now remained is the motor selection....

:oh:

tested that 19T P / 45T S gives 96deg cel. of motor, ESC is around 45Deg. cel.

Motor is 2350kv with 4S Lipo .... rotor broke ...

Thinking if it help....to use 2100kv motor to lower down motor temperature to around 70deg cel., anyone can give me a hand.....

Countryhick 02.16.2009 04:38 PM

Looks great!!! I think you might want a better quality motor. Maybe try a NEU??
Well done!!

Cheers Andrew

samwong 02.16.2009 08:28 PM

Quote:

Originally Posted by Countryhick (Post 262321)
Looks great!!! I think you might want a better quality motor. Maybe try a NEU??
Well done!!

Cheers Andrew

Thanks .. Andrew..

yes exactly ... I really need a serious motor... but in Hong Kong, it is hardly to find....finally yesteraday I got Losi Xcelorin 2100kv for my second trial.

And I will still keep the gear 19T p / 45T s and see how will the temperature of motor be...

May I know your motor spec (kv) and temperature after a continuous run? and how you compare 2gears system vs single gear system in 960 brushless conversion...in terms of motor temperature, acceleration and run time? as I still unsure if it need 2gears system for brushless... to achieve a comparable speed with other Gas Power 960. But seems now just use 2nd gear gives motor too much loading and temperature...( at least with cheap motor, hope Losi 2100kv works better)

Countryhick 02.17.2009 04:42 PM

Quote:

Originally Posted by samwong (Post 262382)
Thanks .. Andrew..

yes exactly ... I really need a serious motor... but in Hong Kong, it is hardly to find....finally yesteraday I got Losi Xcelorin 2100kv for my second trial.

And I will still keep the gear 19T p / 45T s and see how will the temperature of motor be...

May I know your motor spec (kv) and temperature after a continuous run? and how you compare 2gears system vs single gear system in 960 brushless conversion...in terms of motor temperature, acceleration and run time? as I still unsure if it need 2gears system for brushless... to achieve a comparable speed with other Gas Power 960. But seems now just use 2nd gear gives motor too much loading and temperature...( at least with cheap motor, hope Losi 2100kv works better)

I'm using a NEU 1512 2050Kv. (but I run 6s LiPo) I think your motor KV will be a little low to achieve the same speed as a gas 1/8th, unless you can drastically gear up, which will possibly add to your overheating issues.

Because I use a large aluminum motor mount, the chassis of the car dissipates a lot of heat (this is how the gas motors also dissipate their heat) running temps are around 70deg C. (30deg ambient) This reading is after continuous running on the racetrack for 10 Mins. I see you have a CF motor mount and this could partly be some of your problem.

After running the car with a 2 speed, I don't feel that there are really any benefits. If there was a larger ratio change between first and second then there maybe an advantage.

Because I haven't tested with a single speed I can't definitively state if the run time is better or worse. I do however think there wouldn't be much difference.

Keep us posted!! It's great to see these 1/8 onroad cars popping up :yes:

Cheers Andrew

B4maz 02.17.2009 04:49 PM

Capricorn RC Serpent 960 EP Conversion update 2
 
From Red RC

A 2 speed with no mechanical brake? I'm assuming its not completed yet.

http://www.redrc.net/wp-content/uplo...orn960ep-1.jpg

http://www.redrc.net/wp-content/uplo...orn960ep-2.jpg

http://www.redrc.net/wp-content/uplo...orn960ep-3.jpg

http://www.redrc.net/wp-content/uplo...orn960ep-4.jpg

http://www.redrc.net/wp-content/uplo...orn960ep-5.jpg

http://www.redrc.net/wp-content/uplo...orn960ep-6.jpg

samwong 02.17.2009 08:54 PM

Thanks for your data sharing...

Regarding the temperature problem in motor.... I have some thing not certain...

1. Given other things the same, Higher voltage 6S gives same MOTOR operating temperature as 4S. My thinking...

As either 6S or 4S, the motor rotating force depends on the current on the wiring of motor, and the more current through the wire, the heat will be in proportion. So the heat of motor should relate to Current from ESC, but not related to the voltage of Lipo.

So 6S or 4S will be the same for the Motor Heat issue.
Please correct me.. if I am wrong.

2. The faster the acceleration, the higher the temperature.

As force required is larger for higher acceleration, so current or heat are also larger.

If I adjust the driving style a bit, softer acceleration, that can help the motor heat problem. As currently the acceleration is like a rocket... faster than a 1/12th pan car ..... too much for me.. and others..


3. Braking also gives additional temperature rise.

Heavy and frequent brake ... can make motor suffered additionally.


I will have another trial run with Losi 2100kv ( Diameter is 39mm, maybe torque will be larger ) , 4S and 44T/19T and see the result.

mabu 02.18.2009 04:31 AM

Quote:

Originally Posted by B4maz (Post 262651)
From Red RC

A 2 speed with no mechanical brake? I'm assuming its not completed yet.

The conversions looks nice, but i also assume that's it is not finished yet ...

Countryhick 02.18.2009 04:32 PM

Looks like the mechanics of the brake are there, just no servo.

B4maz 02.18.2009 10:50 PM

Here is the Capricorn Serpent 960 conversion finished.

http://www.rceasy.com/wp-content/upl.../02/cp9604.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9601.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9602.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9603.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9605.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9606.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9607.jpg

http://www.rceasy.com/wp-content/upl.../02/cp9608.jpg

mabu 02.19.2009 02:58 AM

i do not think that 2 gears are needed at brushless conversions. i removed the second gear in my revo ...

how much weight have your serpent conversions? ( including/excluding lipos/fepos? )
I guess my intended 6s fepo will have to much weight :(

samwong 02.19.2009 07:34 AM

2 Attachment(s)
Weight w/o Lipo: 2480g
Weight w/o 4s 6000mah Lipo:3155g

Another test today with 2100kv Losi:

45T s / 19T p
Run Time : 40mins!!
Speed : Comparable to 1/10 Gas Car (preparing to change to 5S or 6S)
Temperature: Motor 52 - 58deg cel. after continuous 10min run (still have around 10deg cel room)

Countryhick 02.20.2009 09:15 PM

Quote:

Originally Posted by samwong (Post 263143)
Weight w/o Lipo: 2480g
Weight w/o 4s 6000mah Lipo:3155g

Another test today with 2100kv Losi:

45T s / 19T p
Run Time : 40mins!!
Speed : Comparable to 1/10 Gas Car (preparing to change to 5S or 6S)
Temperature: Motor 52 - 58deg cel. after continuous 10min run (still have around 10deg cel room)


6S with your 2100KV motor and current gearing should give you around the same top speed as a gas powered 1/8th. Punch out of the corners is another story, you will leave them for dead!!! :na:

I would love to see some video.

I was planning on running mine tonight against other 1/8ths at my local club as it turns out it has been raining and it also looks like I have to go into work :cry:

magman 02.21.2009 10:15 PM




Any plans to do a Mugen MRX-4? I have 3 friends w/Mugens that would be interested in a kit.

samwong 02.21.2009 10:48 PM

4 Attachment(s)
Quote:

Originally Posted by Countryhick (Post 263623)
6S with your 2100KV motor and current gearing should give you around the same top speed as a gas powered 1/8th. Punch out of the corners is another story, you will leave them for dead!!! :na:

I would love to see some video.

I was planning on running mine tonight against other 1/8ths at my local club as it turns out it has been raining and it also looks like I have to go into work :cry:

Last night changed to 5S Lipo, and use Losi ESC also, gearing the same. Test run and found Top speed comparable to Gas Powered 1/8th. :yes:
While Out of corner acceleration and start acceleration.... is totally different world ..:gasp:

Another thing found is after changing ESC to Losi, and changed the timing to "low", also with two heat sinks added w/ thermal glue, the motor temperature dropped to 48deg cel only!! and ESC temp around 43deg cel. after continuous run.:yipi:

Attached some photos after the changes.... should go to the track for a first run and try to take some video next Sunday.

Ryu James 02.22.2009 05:10 AM



what size lipos are those in these pics and what are the largest lipo packs that will fit in this conversion? could a standard 4s or 5s 5000mah pack fit?

if so, that has got to be the cleanest conversion i have seen on a 1/8 Serpent. with the exception of Serums conversion here on the forum. he built a super clean 1/8 serpent that is very similar to the Capricorn kit.

phatmonk 02.22.2009 09:09 AM

I had a powerracing XR80 and just driving on dry summer pavement required tire traction compound and it was a handfull to drive.The payoff was winding it up and hitting 70 mph in seconds.So what brushless motor will fit this conversion.It looks like a 36mm XL fiegao type motor in the car now.I would drop the 2 speed though.Still very cool and I want one now.Would a Neu 1515/1.5d/F fit?

Romster 03.01.2009 11:08 PM

So where can we by the conversion? How much is this conversion?
I went on web-site nothing......when will it be available?
Planning on converting the 1/8 Kyosho evo.

jhautz 03.01.2009 11:52 PM

how do you change the batteries in that thing? Looks like you have to take the drive belt off to get to the battery.

jahno30 03.03.2009 08:38 PM

Hey guys....
I too am doing a 1/8 conversion..

I have the power racing X8and was considerring the CC 2650 combo , but am unsure as to where to get a single gear conversion and also if a 4S 25c 4000 zippy rhino will be enough to push the car to some decent speeds

heres a link to the battery it's weight looks really good for a 1/8 onroad project. Just not sure if It'll be enough
http://www.hobbycity.com/hobbycity/s...idproduct=7656
let me know what you think

Romster 03.04.2009 12:25 AM

Soooo it makes me wonder if they will have an update version since the New serpent 966 is coming out. Time to go on Flea--bay for serpent 960 roller.

Countryhick 03.04.2009 06:29 AM

Quote:

Originally Posted by jahno30 (Post 266677)
Hey guys....
I too am doing a 1/8 conversion..

I have the power racing X8and was considerring the CC 2650 combo , but am unsure as to where to get a single gear conversion and also if a 4S 25c 4000 zippy rhino will be enough to push the car to some decent speeds

heres a link to the battery it's weight looks really good for a 1/8 onroad project. Just not sure if It'll be enough
http://www.hobbycity.com/hobbycity/s...idproduct=7656
let me know what you think

I think you will have good speed with that combo of motor and battery. Where were you thinking of mounting the battery? Most 1/8th chassis have a clearance of 30mm between the top and bottom decks (yours maybe different).
Keep us updated with some pics as you progress.

P.S.
For those interested, I took some new video footage of my car last weekend. I have to edit up a clip as I used 2 cameras at the one time.

jahno30 03.04.2009 02:09 PM

Quote:

Originally Posted by Countryhick (Post 266784)
I think you will have good speed with that combo of motor and battery. Where were you thinking of mounting the battery? Most 1/8th chassis have a clearance of 30mm between the top and bottom decks (yours maybe different).
Keep us updated with some pics as you progress.

P.S.
For those interested, I took some new video footage of my car last weekend. I have to edit up a clip as I used 2 cameras at the one time.

I was thinking about using some 6mm carbonfiber, plastic, or plaxiglass flat spacers under the 5xscrews that hold the radio plate to give the additional height required and use plastic spacers on the chassis to possition the battery... I was even considering going with the 6S 4000 http://www.hobbycity.com/hobbycity/s...idproduct=7657 and switch the steering servo to lay on top of the radio tray to get the battery in but using a different kv motor.. My thoughts were the 2650kv combo maybe the better option if I could keep the weight low enough, but not sure if the run time will be any good........what do you think will work out better?

samwong 03.06.2009 12:06 PM

Quote:

Originally Posted by Romster (Post 266758)
Soooo it makes me wonder if they will have an update version since the New serpent 966 is coming out. Time to go on Flea--bay for serpent 960 roller.

Seems the brake mount block in 966 lays more forward than 960... which need to think a bit more on how to mount the motor....

Countryhick 03.06.2009 04:28 PM

Quote:

Originally Posted by samwong (Post 267474)
Seems the brake mount block in 966 lays more forward than 960... which need to think a bit more on how to mount the motor....

For anyone interested in doing one of these conversions, forget about doing them to Mugen's or Serpents. What you want to get is a Shepperd racing VeloX (click here) If you look closely they have done away with the disc brake on the transmission shaft and incorporated the brake into the rear axle/diff. What this all means is there is a huge amount of room to fit your motor and still keep the mechanical brakes.

Countryhick 03.06.2009 04:54 PM

Quote:

Originally Posted by jahno30 (Post 266841)
I was thinking about using some 6mm carbonfiber, plastic, or plaxiglass flat spacers under the 5xscrews that hold the radio plate to give the additional height required and use plastic spacers on the chassis to possition the battery... I was even considering going with the 6S 4000 http://www.hobbycity.com/hobbycity/s...idproduct=7657 and switch the steering servo to lay on top of the radio tray to get the battery in but using a different kv motor.. My thoughts were the 2650kv combo maybe the better option if I could keep the weight low enough, but not sure if the run time will be any good........what do you think will work out better?

There are 2 ways of thinking about this.
1. Do you want to race it against other gas 1/8ths or
2. Do you plan on just bashing?

If you want to race it I think keep the weight down. The biggest problem with my car is the handling, don't get me wrong it's easy to drive but it is no where near as nimble as it's gas counterparts due to it's weight (almost 2lbs heavier)

If you plan on just bashing go for battery capacity.

With regards to the spacers try your best to find batteries that will fit without modification. I think you will compromise the structural integrity of the car by using spacers.

Nuclear 03.06.2009 05:27 PM

Speed Passion Schumacher Coversion is out now....
 
hello, just wanted to input....there is a easier way,....Schumacher and Speed Passion came out with a "Brushless Conversion" for the 1/8 Serpent On Road Car. I dont have a Link for it, but it is out.....search....

thanks,,,,,

Countryhick 03.06.2009 05:40 PM

Quote:

Originally Posted by Nuclear (Post 267539)
hello, just wanted to input....there is a easier way,....Schumacher and Speed Passion came out with a "Brushless Conversion" for the 1/8 Serpent On Road Car. I dont have a Link for it, but it is out.....search....

thanks,,,,,

You mean THIS one???
I still haven't heard of anyone that has one. Did they even release it????

samwong 03.06.2009 09:47 PM

1 Attachment(s)
Quote:

Originally Posted by Countryhick (Post 267542)
You mean THIS one???
I still haven't heard of anyone that has one. Did they even release it????

I am using that... Speedpassion conversion kit.. but with a lot of modification..:yes:

samwong 03.06.2009 09:57 PM

Quote:

Originally Posted by Countryhick (Post 267523)
For anyone interested in doing one of these conversions, forget about doing them to Mugen's or Serpents. What you want to get is a Shepperd racing VeloX (click here) If you look closely they have done away with the disc brake on the transmission shaft and incorporated the brake into the rear axle/diff. What this all means is there is a huge amount of room to fit your motor and still keep the mechanical brakes.

What benefit (or problems) of using mechanical brake vs. motor braking ?
As I still testing the motor direct drive (45S/18P), braking to the car seems no problem up-to-now...:yes:

Shepperd design is great for conversion, but the drawback is lack of support and parts in Asia region.....:oh:

Countryhick 03.06.2009 10:40 PM

Quote:

Originally Posted by samwong (Post 267626)
What benefit (or problems) of using mechanical brake vs. motor braking ?

Mainly heat build up in the ESC. as the kinetic energy of the car is transferred to heat via the ESC FET's. (some energy does however also go back into the battery)



Quote:

Originally Posted by samwong (Post 267626)
As I still testing the motor direct drive (45S/18P), braking to the car seems no problem up-to-now...:yes:

I think there are pro and cons to both ways of braking.



Quote:

Originally Posted by samwong (Post 267626)
Shepperd design is great for conversion, but the drawback is lack of support and parts in Asia region.....:oh:

That would be a problem.


Have you got any video yet Sam?

samwong 03.07.2009 05:54 AM

Quote:

Originally Posted by Countryhick (Post 267631)
Mainly heat build up in the ESC. as the kinetic energy of the car is transferred to heat via the ESC FET's. (some energy does however also go back into the battery)

I think there are pro and cons to both ways of braking.

That would be a problem.

Have you got any video yet Sam?

Here it goes....:yes:

http://www.rc-monster.com/forum/show...830#post267830

Romster 03.07.2009 08:42 AM

which conversion to get... for racing...
 
Nice vid thanks. :)
I want a conversion for racing.
Shepperd new kit is like $800.:surprised::oh:
Just looking for a roller right now.
It would be really kool if Mike made a conversion.

jahno30 03.08.2009 03:35 PM

Quote:

Originally Posted by Countryhick (Post 267532)
There are 2 ways of thinking about this.
1. Do you want to race it against other gas 1/8ths or
2. Do you plan on just bashing?

If you want to race it I think keep the weight down. The biggest problem with my car is the handling, don't get me wrong it's easy to drive but it is no where near as nimble as it's gas counterparts due to it's weight (almost 2lbs heavier)

If you plan on just bashing go for battery capacity.

With regards to the spacers try your best to find batteries that will fit without modification. I think you will compromise the structural integrity of the car by using spacers.

I am looking to race against the other nitro 1/8's ...
We only have a short 150- 180 foot strait away the rest is technical really a 1/10th track thats been extended slihtly.....
Do you think a 4S 4000 mah battery be enough?

Countryhick 03.10.2009 07:25 AM

Quote:

Originally Posted by jahno30 (Post 268030)
I am looking to race against the other nitro 1/8's ...
We only have a short 150- 180 foot strait away the rest is technical really a 1/10th track thats been extended slihtly.....
Do you think a 4S 4000 mah battery be enough?

4s should be fine. Only testing will give you a true indication of run-time however.

Countryhick 03.10.2009 07:29 AM

Quote:

Originally Posted by samwong (Post 267713)

Sam those video's are awesome.

Where is that track located? It looks great!

In the 5S vid you can really see the punch that thing has :yes:

Whats you next modification?


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