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Old 12-04-2008, 12:13 PM   #271
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Nice catch on the switch off configuration. It does make a difference and we are checking out this unplanned effect that could be good. Even a blind elephant finds a peanut once in awhile...


What are you seeing for servo performance with these boosters?

How hot do they get?

The one listed above is rated at .5A at 5V. We have gone to great lengths to supply 3A at 6v for good servo performance. Even with the lighter load of 1/12 this has to slow things down a bit.
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Old 12-04-2008, 12:34 PM   #272
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The booster that I have is rated at 1 amp continuous and 1.5 amps peak but that's probably rather optomistic. It's a very basic buck boost and only has like 5 components or so.

The servo isn't all that bad actually. I'm used to running at about 5 volts or so in 4 cell so it's not a big deal (you're not boosting up to 6v in 4 cell as far as I know). A properly regulated 6v booster would be great even if it's a little bigger than what I have.

I'll know more about how hot it gets after this weekend and I have an extra that I can send your way if you want to take a look at it.
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Old 12-04-2008, 08:20 PM   #273
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That's where I got mine from. I'll have a look and see if I can find the manufacturer when I get out of work.

Am I the only one that thinks about "Sofa King" on Saturday Night Live when I see Hobby King?

Fred - Did you wire your switch to the negative or positive side?

Also, before the voltage booster or after?
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Old 12-05-2008, 04:19 AM   #274
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I wired mine in on the positive side before the booster. If you wire it up after the booster it will run the booster all the time once a battery is hooked up. I don't think that it matters if you wire the switch into the positive or negative side.
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Old 12-05-2008, 07:02 PM   #275
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it totally works! i was running 17.5 and only about 3 10ths offmy pace, and i suck, i have a 13.5 coming soon! pulse!
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Old 12-05-2008, 07:49 PM   #276
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VERY interesting thread...having converted to lipo's for everything else, this may get me to buy another 12th scale to have around. Very cool.
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Old 12-05-2008, 09:15 PM   #277
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will smc lipos fit on a trf415msx?
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Old 12-05-2008, 09:28 PM   #278
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will smc lipos fit on a trf415msx?
Yeah, But this is the 12th scale single cell lipo. You may want to check out the smc 4000 and 5000 28c 7.4v lipo thread.
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Old 12-05-2008, 10:00 PM   #279
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oh! sorry!
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Old 12-06-2008, 06:13 AM   #280
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Testing result: failed

Test parts:
SMC 1c lipo
Speed Passion LPF Speedo
Futaba R603FS Receiver
Dimension Engineering LVBoost
Speed Passion 10.5T motor
JR Z3650 servo
Running traditional 4c nimh rollout for 10.5

Configuration:
- LVBoost configured to output 5v
- Wired the LVBoost from the speedo battery +/- connection (input) to receiver B/C port (output)

Observations:
[Late last night] Ran one or two laps with speedo power switch off. Car eventually died (no power shown on receiver)

[Morning] Charged 1c lipo for the first time hoping I observed a input voltage problem. I was unable to pull 1 lap on my local track at speed. Ran about 5-6m with the speedo power switch on until the motor started cogging.

Pulled the car off the track and pulled out the volt meter. The battery had 3.8v, but the LVBoost was now only outputting 3.4v. With the car on a stand and a friend working the radio trigger the car continued to cog and also not respond to throttle inputs. Voltage on the output for the LVBoost stayed at 3.4v

Conclusion:
The dimension Engineering LVBoost appeared to work well on the bench but its specifications were not sufficient for the on track loads.

The stability of the car when power was consistent was OK, and lap times compared to my 17.5/4c nimh configuration but there was more speed in the car if the setup could be adjusted.
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Old 12-06-2008, 08:43 AM   #281
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What is the max current these can be charged with? 1C?

Thanks,
Carter, battery neophyte.
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Old 12-06-2008, 12:16 PM   #282
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Quote:
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Testing result: failed
.
Sorry to hear that.

Do you have a capacitor installed on the RX?

I bought one of those cheap $5 modual from hobbywing and it appeared to worked well. I installed a UltraLow ESR 6.3V 3300uf capacitor on the RX. Just like ESC's need capacitors to work properly under loads, the Modual may need a power reserve capacitor too.
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Old 12-06-2008, 12:29 PM   #283
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Quote:
Originally Posted by darcydawg View Post
What is the max current these can be charged with? 1C?

Thanks,
Carter, battery neophyte.

All our Lipos can be charged at 2C with no issues.
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Old 12-06-2008, 12:32 PM   #284
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Judging by the size of the Novak Booster I think the cheaper ones must not supply enough power. I will contact Novak for a new update on when they should have the units ready. I believe it will include a cutoff for single cells which is very good to use.
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Old 12-06-2008, 01:26 PM   #285
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Danny/SMC

You have a PM
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