Motor brakes or mechanical?

[Ryu James]

Originally Posted by Mozzy

Yep, same track, same surface, same ambiant & battery temps, but, the motor temps were slightly higher when using motor brakes.
I'm guessing with the motor braking it creates more heat to make the motor brake. Could that be the reason?

that is exactly the reason. this is advertised in all of Teknos conversion ads; that mech. brakes result in lower temps. your motor has to work a lot harder to stop a 9lb truck by spinning in reverse than it does when you let a servo do the work.

btw, the proof is in the pudding. 4mins is mins. more than i have heard from anyone seeing increase the other way around. granted you would get a more accurate depiction if you recorded say...10 run times of each setup with the exact same setup.

Mozzy, do you always track your runtime? if so, when you had motor brakes did your runtimes ever vary by more than 4mins? if so, then it is simply just that much variation exists in your runtime regardless of brake setup. let us know more about how you did your test? more than once? just one time?

Monster Mike has just joined this discussion without knowing. This is a quote from the store (1/8th conversion kits):

*Direct drive - like electric should be. Stay connected to your drive train - this is the most efficient drive scenario for electric power. Power delivery can be tuned on your radio and esc. Motor braking is consistent, tunable and puts energy back into the battery pack. No extra rotating weight, extra components or complexity of mechancial brakes. Less parts to fail or tune. Low weight, optimum acceleration and control. Motor is coupled to the center diff, allowing the chassis to flex as intended without affecting gear mesh or accelerating gear wear.

[Ryu James]

Originally Posted by drkdgglr

Monster Mike has just joined this discussion without knowing. This is a quote from the store (1/8th conversion kits):

imo, that is mostly marketing and aimed at the "other" kits to try to get sales. despite some of it being truth (and some of it opinion) it is not the "gospel" just because it came from this site or from Mike. (as much as we all love both!)

read this from the Tekno site.

*Mechanical brakes with front/rear brake bias provides world class handling while lowering operating temps and easing the stress on your motor, ESC, and drivetrain
*Patent pending Elektri-Clutch system to tune the power delivery of the hottest brushless motors. Our hardened steel clutchbells will last and last because the motor is disengaged from the drivetrain off power. For those that prefer direct drive, our kits are compatible with long shank 5mm bore mod1 pinions as well. More options and flexibility than any other kit on the market.



oh hell, who are we kidding? this debate will never end will it?

[Mozzy]

Originally Posted by Ryu James

that is exactly the reason. this is advertised in all of Teknos conversion ads; that mech. brakes result in lower temps. your motor has to work a lot harder to stop a 9lb truck by spinning in reverse than it does when you let a servo do the work.

btw, the proof is in the pudding. 4mins is mins. more than i have heard from anyone seeing increase the other way around. granted you would get a more accurate depiction if you recorded say...10 run times of each setup with the exact same setup.

Mozzy, do you always track your runtime? if so, when you had motor brakes did your runtimes ever vary by more than 4mins? if so, then it is simply just that much variation exists in your runtime regardless of brake setup. let us know more about how you did your test? more than once? just one time?

I have timed my runs from the start (which isn't that long ago) to see the difference between the gearing/motor & battery chosen.

I'm using Zippy 5S packs both 4000 & 5000 with a 2.5d in my CRT on a 15t pinion.

The difference between the two packs is 5mins.

I have a timer on my 3PKS & as soon as I hit the track or accelerating I hit the start button. If I roll I stop it untill I begin accellerating again. As soon as the pack shows signs of dumping, I stop the timer.

[_paralyzed_]

Mozzy seems to have the real world answer. Of course, theoretically regenerative motor braking would be more efficient. But with an r/c, on a track, how often do we brake and coast to a stop? Never. We're either stabbing the brakes or locking up the wheels, which of course wouldn't regain any power. More a/b comparisons like Mozzy did will confirm that mech brakes are the more efficient setup. Very interesting. One more reason to always keep an open mind and always keep learning. Thanks Mozzy!

[Ryu James]

i totally agree with you paralyzed. the proof is in the pudding and Mozzy is the one who has brought some to the table.

@George
i agree with you about the elektri-clutch setup. I dont like it. i definitely prefer direct-drive. i dont know, i was going to pull out a clutch again this week and try it again since i am a better driver now. the Tekno guys still religously use the clutch setup. but Danny recently told me that one of their biggest sellers recently are the long shank pinions. that would be a good user name - Longshanks. lol. anyway, when i switched from cluthc to direct drive i was expecting some huge difference but i didnt notice much. other than the pinion is sooooo much quieter. i can still control at low speeds. not quite like a clutch i guess but i have never felt i need to switch.

mozzy, thanks for sharing more info. so it sounds like on motor breaks your run times were always roughly the same amount of run time. so the mech brakes 4 extra mins was after several times with motor breaks, right?

[Mozzy]

Originally Posted by Ryu James

i totally agree with you paralyzed. the proof is in the pudding and Mozzy is the one who has brought some to the table.

@George
i agree with you about the elektri-clutch setup. I dont like it. i definitely prefer direct-drive. i dont know, i was going to pull out a clutch again this week and try it again since i am a better driver now. the Tekno guys still religously use the clutch setup. but Danny recently told me that one of their biggest sellers recently are the long shank pinions. that would be a good user name - Longshanks. lol. anyway, when i switched from cluthc to direct drive i was expecting some huge difference but i didnt notice much. other than the pinion is sooooo much quieter. i can still control at low speeds. not quite like a clutch i guess but i have never felt i need to switch.

mozzy, thanks for sharing more info. so it sounds like on motor breaks your run times were always roughly the same amount of run time. so the mech brakes 4 extra mins was after several times with motor breaks, right?

I'd driven the CRT with motor brakes alot prior to going the mech route. Was also trying different gear ratios to see what was best & then settled on my current set up.

This set up was used with both motor & mech brakes & the mech brakes yielded a longer runtime by over 4mins.