brushless 1/5 4wd conversion about to begin! couple questions. - Page 4 - RC-Monster Forums

Ryu James · 07.02.2009, 07:00 PM

the only radio gear i have is a tiny spektrum reciever. i am gonna build a small waterproof box like i did with my slash and finding a spot for wont be hard as this chassis has tons of room.

i will be using mod1.5 gears. RCM is due to have the mod1.5 pinions anyday now i think and i have found a mod1.5 spur gear with the help of Linc the Pimp.

i dont think i am going to run the 2230 now. i do want tons of power but i defintiely dont want my driveline and gears busting everytime i get on it. i dont mind breaking my toys but i am starting to think the 2215 will be better suited. still not sure though. i am defintley keeping my 2215 no matter what. i will run it first and see how it does. if it feels underpowered or running too hot then i will worry about finding a way to get the 2230 in. but for now i am moving forward with full intention of running the 2215.

KaztheMinotaur · 07.02.2009, 09:03 PM

What ESC are you going to use? How many amps do you expect to pull?

lincpimp · 07.02.2009, 09:50 PM

Glad I could help! Nice to see someone tackling a big truck like this. I will be interested to see your success as I would like to do a truck like this.

Ryu James · 07.03.2009, 04:31 AM

Quote:

Originally Posted by KaztheMinotaur

What ESC are you going to use? How many amps do you expect to pull?

i plan to use the Castle Hydra 240 HV, which is capable of 240amps. i will run to 5s, 18.5v, 5000mah, 30c packs in series. i may pick up some of the many differnt new 35c packs popping up everywhere now.

btw, do you have a rampage?

Unsullied_Spy · 07.03.2009, 08:21 AM

Your conversion is coming along nicely! IMO it's smart to start off with the 2215, I am sure it has plenty of power for this application.

Thanks for the pics of the 2230, I've only seen a few pics of them. I can't imagine what a person could possibly use one of those for...

lincpimp · 07.03.2009, 10:06 AM

If you run 10-12s and are not trying to gear too high I am sure the hv180 will work. Up at 10 and 12s pulling more than 100amps is making some serious power. I used a 60amp esc on 8s in a savage and had no issues, so triple that rating with higher voltage in a 15th scale should not pose a problem.

RJ, can you weight the chassis without the motor or batteries as it sits with the tires on? Just wondering what it will weigh with my proposed setup, and I know the weights of all of the individual components.

Ryu James · 07.03.2009, 03:20 PM

Quote:

Originally Posted by lincpimp

If you run 10-12s and are not trying to gear too high I am sure the hv180 will work. Up at 10 and 12s pulling more than 100amps is making some serious power. I used a 60amp esc on 8s in a savage and had no issues, so triple that rating with higher voltage in a 15th scale should not pose a problem.

RJ, can you weight the chassis without the motor or batteries as it sits with the tires on? Just wondering what it will weigh with my proposed setup, and I know the weights of all of the individual components.

yes. i have a nice little digital scale i picked up a few weeks ago for weighing RC stuff. it will weigh up to 30lb i believe. as soon as i get back home i will post the weight of just the roller.

aqwut · 07.03.2009, 12:50 PM

I think I emailed castle last year about using the Hydra's in a Land vehicle.. they said it wasn't a good Idea, if I can remember...

BL_RV0 · 07.03.2009, 12:52 PM

It's been done though.

Ryu- Maybe you can do a watercooling setup for the hydra? I mean... you do have all that extra chassis space...

Unsullied_Spy · 07.03.2009, 03:12 PM

Quote:

Originally Posted by aqwut

I think I emailed castle last year about using the Hydra's in a Land vehicle.. they said it wasn't a good Idea, if I can remember...

They also say not to run the MM past 3s

There are people successfully running Hydras in cars and trucks, the biggest issue is heat dissipation but if you're running a 240 amp ESC and drawing half that you should be able to get some decent run time out of it before letting it cool. If you feel like voiding the warranty even further you could modify the ESC to take heatsinks, but you would probably need some kind of thin heatpipe cooler in this application.

MetalMan · 07.03.2009, 12:53 PM

Just to throw it out there: my XLB (1/7 4wd 15lb center diff buggy) now runs a 1521 2Y on 10s 3700mah Lipo through a HV-110. It's geared for mid to low 40s but it pushes out over 5hp on peaks (loads of power). The HV-110 heats up to about 120-130deg. after maybe 10mins. I'm sure things would cool down a bit if I played with the ESC settings but this might give you an idea of what to expect from an ESC.

Overdriven · 07.04.2009, 01:19 AM

I had an FG monster truck awhile back in need of a steering servo. I too was concerned about the relatively low torque ratings of the 1/4 scale servos out there and picked up two 1/4 scale 200oz hitec's. Thankfully I tried using just one first and ended up returning the other as it turned the wheels like my 9100T did on my Revo. Also the 1/4 servos have stronger gear sets in them to take the higher shock loads a heavier truck will see. I was also powering the servo directly off the reciever battery instead of through the reciever, which alot of 1/5 guys do. It gives the servo some more power and insures the reciever doesn't burn out from the increased load placed on it.

Edit: Cool project man, I really dig the large scale stff, can't wait to see it finished with vids.

Ryu James · 07.04.2009, 05:45 AM

Quote:

Originally Posted by Overdriven

I had an FG monster truck awhile back in need of a steering servo. I too was concerned about the relatively low torque ratings of the 1/4 scale servos out there and picked up two 1/4 scale 200oz hitec's. Thankfully I tried using just one first and ended up returning the other as it turned the wheels like my 9100T did on my Revo. Also the 1/4 servos have stronger gear sets in them to take the higher shock loads a heavier truck will see. I was also powering the servo directly off the reciever battery instead of through the reciever, which alot of 1/5 guys do. It gives the servo some more power and insures the reciever doesn't burn out from the increased load placed on it.

Edit: Cool project man, I really dig the large scale stff, can't wait to see it finished with vids.

so do you think i should go with a 1/4 scale servo then? i heard the JR HVT has huge teeth on the gears. the stock setup on this uses a 1/4 servo for the steering and a standard servo for the brake. i was just going to use standard for both. i did find these 1/4 servos. defintely the strongest i have found so far in the 1/4 size.

http://www3.towerhobbies.com/cgi-bin...&I=LL6955#tech

http://www3.towerhobbies.com/cgi-bin...XVPF0&P=8#tech

to linc:

i weighed the chassis as a BL roller and it weighs 19.3 pounds. that was with the battery trays on it. so here are the other stats, according to memory.

servo: 2.5oz each. x 2
2215 Neu: 25oz.
NeuEnergy 5s Lipo: 22.5oz x 2
Hydra 240HV ESC: 7.7oz

So all together i get a weight of roughly 24.5 pounds. I am gonna add on another 8 to 16 ounces for wire, screws, mech brakes, mounting hardware for esc, etc. so the finished product should weigh in at 25lb or just over.

This is the first build i have done where i havent tried to shed weight and been concerned with weight.

_paralyzed_ · 07.04.2009, 06:07 AM

I can't wait to see this come together. Your builds are top notch.

KaztheMinotaur · 08:38 AM

The MT gasser with those HUGH tires weighed 37 pounds! I calculated hte impact force of it hitting something at 35 mph and it came out to around 400 pounds.

I'm currently using a scanner-rc.com servo for steering. 348 ounces at 6V. It is digital and works well for the price of $60. None of the US distributors carry that one so I have to get it from the Canadian distributor. $60 shipped to the US isin't bad though.

What about using this motor? http://www.innov8tivedesigns.com/pro...roducts_id=515 The power seems to be similiar or am I missing something?