Gearing...ing...ing...ing

[o0wiz0o]

RTR with VP links, steering links, alloy knuckles, chubs and lockouts. Big ally shocks and HB Rovers. Ally side panels and weighted front wheels and a dude sat in the seat.

Re-geared to 87t spur and 18t pinion and a Axial 27t.

This has now burned out. :-( I thought I had the gearing right...I've now got a 16t pinion on the way. Will this do? How low do I need to go!

Edit: I guess is do some quite tough crawling...but even razzing it about the back garden the motors get very hot. Going to buy a motor heat-sink and fan...

[Jus]

The heat sink is nothing but a band-aid. I love the 27T Axials in my scx-10's but I have a feeling the much larger Wraith with 2.2 tires is a lot harder on that motor and it just can't handle it.. What are you using for batteries?

You're on the right track though lowering the gearing.. I'm currently running a 16T pinion on my 35T HH Expert motor as 18 was getting it a little too warm too quickly on 3s lipo.

[JesterSpec]

Take a look at the motor thread here in the wraith forum. It will help.

[frdtrkguy]

Originally Posted by o0wiz0o

Re-geared to 87t spur and 18t pinion and a Axial 27t.


Edit: I guess is do some quite tough crawling

For tough crawling with a 27t motor I would go 14 or even 12/87...

[k goodrich]

I put the 14/87 combo in my daughters wraith and it has worked out. If this is a pure crawling wraith you might go with a 12/87 combo as stated above. Just get both and start with the 12/87 and watch your temps. For crawling i started with a 35 turn holmes motor and a 16/87 combo and it was very nice. Enough wheel speed and crawled great.

[o0wiz0o]

Thanks guys. I'm running 2 cell LiPo.

I'll give the 16t a spin and hope to get a Tekin 35t next. If that combo still runs to hot i'll drop the pinion down more. At the end of the day I'll have a lovely range of pinions! :-)

[redrokin00XJ]

Axial motors are junk. You get what you pay for.

[derek_18mt]

I run a 17t on a Reedy sonic 17.5 and its very cool. How are you guys getting under a 17t on the motor? I couldn't get a 15 to mesh at all..

[frdtrkguy]

Originally Posted by derek_18mt

I run a 17t on a Reedy sonic 17.5 and its very cool. How are you guys getting under a 17t on the motor? I couldn't get a 15 to mesh at all..

Bigger spur..

[derek_18mt]

Originally Posted by frdtrkguy

Bigger spur..

Oh I guess I miss read to fast, I seen 87t spur so I figured. Mybad..

[rockrigcustoms]

im running 14/86 stock esc, ccbec hh 27t & 2s on my sons wraith with tsls, alum rims and tin panels and im still seeing 130*. the rig is just fast enough to be faster than he can walk. (hes 3) but it climbs like a goat.

im running stock gearing on mine br-xl, axial 20t(HH13t cm is in the mail to me) with 3s. ripsaws,ssz-9s, rubi body. pretty light. my temps are easy over 160*. mine is twice as fast as his and crawls ok(motor stinks) but wheel speed is insain!! hoping i can get my 13cm to be somewhat as quick without a heat issue. aslo switching to tsls so smaller dia tire.

[o0wiz0o]

Thanks.

I put the mud slingers on which are smaller and went for a long trek on the beach. Still got hot but not as bad. I'm thinking about buying another gearbox/transmission so I can have one for speed and one for crawling and just switch them out....

The smaller tyres ruin the looks though IMO... :-)

[Jay-Em]

The axial stock-motors are really the cheapest-of-the-cheapest, despite the nice sticker. They are ,like 3$ a pop straight from china, Axial slaps a $0.15 sticker on it.. "Shazamm!"suddenly it's a $20.- "option-part"

If You're not after insane speeds, a Titan 12t on 2s or a Titan 21t on 3s is a good, cheap alternative. Don't expect to break any speed-records though.

The Titans are 550-size motors with a flux-ring, and have tóns of torque compared to those wheezy 540's. I tried 23/80 gearing with it, and stíll it (the 12t Titan on 2s) didn't get any hotter than about 40 C... Díd twist my drive-axles into fusili's though

Heck! Ány cheap 550-size motor beats the snot out of the axial 540's

[o0wiz0o]

Well am running 16/87 now and don't want to go any lower really. The unknown motor in it is holding up ok. This is a lot better quality and cost $70 when my bro bought it. He thinks it's about 20t but can't be sure as the label is missing...

[Speedweigand]

Originally Posted by derek_18mt

I run a 17t on a Reedy sonic 17.5 and its very cool. How are you guys getting under a 17t on the motor? I couldn't get a 15 to mesh at all..

What kind of batteries are you running?

Originally Posted by o0wiz0o

Well am running 16/87 now and don't want to go any lower really. The unknown motor in it is holding up ok. This is a lot better quality and cost $70 when my bro bought it. He thinks it's about 20t but can't be sure as the label is missing...

Get the 14t pinion, a BEC and run 3s... it'll be faster than it is now and run cooler. How many motors have to die before you believe me?

I'm running 14/87 here on the Velineon. Mine starts at 1:21 on 2s then the battery craps out and I switch to 3s pack, top speed is about 20mph.

[o0wiz0o]

I believe you

3s looks impressive. Would I not have to change my ECS though? I though the stock one was hit and miss with three cell use.

If I bought the same setup as you is this suitable for some very slow crawling too?

[Tonysmini]

Get yourself a CC BEC and use that to power your RX, servo and lights, and update your ESC software with a Castke Link, you should have no problems with 3S battl then. You may need to drop a tooth or two on your pinion again.

I run this on my Wraith with one of igbandy's Novak motors and it's great.

[nitrooxide]

Well or like i did.

Fx-r tekin 45t on 3s, still on stock gearing 20/80.
35-40 packs still no probs (1500mAh/25min-30min).

well 20/80 is a bit high, the 45t sometimes a bit to hot for my taste.
going down to 18/80 = 4.44 endg. thats 11% lower then wraith stock



but still stock works for me atm, just think before throttel your way out of a evil bind.
bind + fullthrottel = Amps going wild * blue smoke

100% crawling btw. bashing is boring <-- my op.

[Speedweigand]

Originally Posted by o0wiz0o

I believe you

3s looks impressive. Would I not have to change my ECS though? I though the stock one was hit and miss with three cell use.

If I bought the same setup as you is this suitable for some very slow crawling too?

It will run 3s all day with a BEC, you just cant go below a 19turn motor.

Crawling is about gear reduction, this is 16/87 3s training mode. Training mode limits the output to 50% The motor doesn't get hot but the esc might a little. If you came over and we were going just "crawling" I would rock my 12 or 14t pinions so I have more control.

If it's not fast enough consider 4s and a slower turn motor, the extra voltage will give you more rpm and greatly improve top speed. For example;
the velineon is 3500kv, 1v=3500rpms so at 8V (2s) it churns 28,000rpm. At 28K and stock gearing (4:1) it goes about 20mph.

3500kv X 12V (3s) = 42,000rpm so with all that extra rpm we can run 30% less gearing and achieve the same top speed.

On 4s, IF the Velineon would survive it would turn 56,000rpm then we could run a 12t pinion and still achieve the same top speed.

Why does this help so much? well at 50% throttle on 4s, that would be the same as 100% on 2s. Does running at half capacity sound better than running at all out?

Finally here's gearing as simple as I can make it.

You and Billy have matching 10 speed bikes... Billy is using the biggest chainring in the back (low gears) and you are using the smallest(high gears), you both are in the middle frt ring.
On flat ground you are going to smoke billy in a race, but now we get to a small hill. Billy is still sitting down and barely notices the hill doesn't lose any speed. You on the other hand are really starting to crank, and if you slow down it gets even harder to pedal.
Now we get to a pretty big hill, Billy is still seated but starting to work harder, you on the other hand are standing, pedaling has become very difficult and your sweating.
Last part of the climb is a damn near vertical with boulders, billy is now standing, working hard and sweating a little, his speed is slow but steady.
You get 2 options!
Option 1
It's just too much, you are literally coming to a stop at the bottom of each peddle stroke, your squeezing the bars, sweating and using every muscle you have to complete each peddle stroke... then you bitch out and walk the rest of the way (magic smoke).
Option 2
Lets say you eat steroids like candy and can squat a small house(550 can on 4s). So now you are standing and your powerful roid filled legs are cranking on the pedals, the frame is twisting from the torque being generated by the bottom bracket. Finally the crank arm snaps off from the strain... you smash your tiny roid nuts off the top tube and crash into the rocks (broken drivetrain)

You with me so far?
Same analogy but with voltage applied... you and Billy are back on flat ground and you are smoking him, as a human your pedaling at about 140 cycles per minute(cpm) and you are cruising at @15mph. Billy's 140cpm is only getting him 8mph... but Billy is industrious and while he was waiting for you at the top of the hill he bolted a weed eater motor to his bike. Now Billy's weed eater motor can run a much higher cpm than it's human counterpart you. You are surprised to see Billy pull along side and pass you with his 300cpm(higher voltage) and 16mph top speed.

Okay, questions?

I realize that this is not 100% accurate but it's on the same page and I figure everybody has ridden a bicycle. Most of you have probably even downshifted for a hill once or twice... why did you downshift? Same reason the Wraith has too

Speed

[Speedweigand]

After that book I forgot to add this video. This is about the closest I get to "crawling" some will say this doesn't count... but none the less its sensorless going slow.