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Old 05-24-2006, 07:12 AM   #16
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So here’s my question, can you use an ESC (i.e. one of the extremely small ones from Great Planes used on electric aircraft and designed for LiPo’s) as a voltage regulator? They are much smaller and lighter than the dedicated voltage regulators plus the added advantage of incorporating low voltage cutoff. The specs on the ESC show BEC at 4.8 to 6.0 volts.

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Old 05-24-2006, 11:07 AM   #17
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What is the point of using the Lipo battery, if it is less Mah than a Mimh. I see numbers like 1000, 1400 mah etc.. My battery is 2300 mah in the 1/8th scale, and 1400 in my touring car (nimh). Are Lipo amp hours different than nimh amp hours??? The cars are already too light anyway.
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Old 05-24-2006, 11:27 AM   #18
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Quote:
Originally Posted by Grinder
What is the point of using the Lipo battery, if it is less Mah than a Mimh. I see numbers like 1000, 1400 mah etc.. My battery is 2300 mah in the 1/8th scale, and 1400 in my touring car (nimh). Are Lipo amp hours different than nimh amp hours??? The cars are already too light anyway.
Mah Are the same across the board the advantage to the LI-PO set up is consistant voltage from start to end. With the VXR regulator you get a consistant 6.4 volts,this makes servo work faster with more torque also. Some one posted that the regulator conserves power and that is incorrect. It regulates power to 6.7 volts that is why we now have a 5amp regulator the previous regulater was to small in amprage and had issues with the amp draw from the load from the digital servos. You are also correct most cars are light, the LI-PO makes them weigh even less. Hope this helps a little.
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Old 05-24-2006, 07:15 PM   #19
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Grinder,

From what I've been reading you get a constant 6 volts regardless of the load from the servos. With the Nimh the voltage dips as the load varies. Someone correct me if I'm wrong.
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Old 05-24-2006, 07:29 PM   #20
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LVR-5000
5A Switching Regulator (6.7V) for Li-Po Rx Packs (For Spectrum 2.4GHz & Futaba PCM only)

Regulator Technology: Switching
Assembly Technology: Surface mount
Weight (including wire and connector) : 9 grams
Dimension (excluding wire and connector): 20 x 40 x 7 mm
Output voltage: 6.7 Volts
Max continuous current: 5 Amp
Input Connector: JST - RCY Polarized
Output Connector: 'J' Type
Wire length: 12 cm
Recommended Application: 1/10th GP and 1/8th GP On-road and Off-road
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Old 05-25-2006, 06:17 PM   #21
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Has anybody tried this LiPo receiver pack (LRX-211300) with a KO Propo EX-10 Helios and a Spectrum receiver? Also what is the weight difference compared to the 5 cell NiMH pack?
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Old 05-25-2006, 06:32 PM   #22
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I dont run it with the KO radio, but I run it with my M8 Spektrum system. The batt with the regulator is less than half the weight than the regular 1200 or 1400 5 cell pack. Mine is around 55 grams compared to 120 grams for my Skyline 1200 pack.
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Old 05-25-2006, 06:33 PM   #23
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These Batteries have not arrived in the U.S. yet but ar due in early next week. below are the specs on the battery.

Capacity: 1300mAh
Weight: 61 grams (including wire and connector)
Li-Po cell arrangement: 2S1P
Norminal voltage: 7.4 Volts
Discharge capability: 10C
Dimension(mm): 83 x 28 x 13
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Old 05-25-2006, 06:42 PM   #24
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Quote:
Originally Posted by Scottmisfits
On most receivers available today, the erceivers have a BEC in them. That's why you don't need one. I know my JR's, Airtronics, and Spektrum receivers do at least. I'm not putting the full 7.4 volts to any of the equipment. I guess I should have said this in the first post. I'm doing it like this in my 1/8th buggy and haven't had an issue.
on JR recievers the RS300 has a bec, but the RS 310 doesn't, not sure about others
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Old 05-25-2006, 10:44 PM   #25
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cansom1tell me y lipos are so soft???
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Old 05-26-2006, 04:31 AM   #26
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Quote:
Originally Posted by Grinder
What is the point of using the Lipo battery, if it is less Mah than a Mimh. I see numbers like 1000, 1400 mah etc.. My battery is 2300 mah in the 1/8th scale, and 1400 in my touring car (nimh). Are Lipo amp hours different than nimh amp hours??? The cars are already too light anyway.
Hello? Lipo is better than the regular battery NOW. If you talking about lightweight , stronger , fast transfer rate or respond, you name it skies the limit lol. Regular battery is way far now than lipo. Lipo is next generation now. Im pretty sure someday you gonna use lipo instead regular battery.? If i saw you using lipo im gonna tell you this:

What is the point of using the Lipo battery, if it is less Mah than a Mimh. I see numbers like 1000, 1400 mah etc.. My battery is 2300 mah in the 1/8th scale, and 1400 in my touring car (nimh). Are Lipo amp hours different than nimh amp hours??? The cars are already too light anyway.
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Old 05-26-2006, 05:52 AM   #27
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Mad_Killah, I don't understand. The MAH, is only good for (time) run times, and I used to use 800mah for 40 minutes or longer.. So, the need for high MAH numbers don't really make sense for my 30 minute mains. Anything over 800mah for a 30 minute main is just wasted battery.

Also, you statement that the cars are too light? I don't get that either, in the world of racing, horsepower to weight ratio is the key. Unless your car is already under the ROAR minimum weight for you class... Then your car is "fat" or too heavy and your weight to power ratio isn't optimized..

I'm using the Novak Regulator with a GWS 2s1P 1050mah lipo.. My serpent 960 is still slighty overweight and ran all my practice and qualifers last weekend before a recharge, which by the way for Lipo takes about 20 minutes.
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Old 05-26-2006, 06:23 AM   #28
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I can run all day with a 30 minute main with it. Practice, warm ups, heats, and main without charging. That is nice to be able to do.
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Old 05-26-2006, 06:31 AM   #29
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always charge the lipo at a 1;1 rate, never overcharge it (if your charger has a 100%+ charge rate, ie it keeps pumping in Mah's past the batteries designated amount).

also, periodically inspect the battery shrink wrap for damage. or better yet wrap it in a balloon and zip tie the end with a ziptie that has fuel tube passed over the zip tie (to avoid the zip tie cutting the balloon).

ALSO, but don't attempt this ...there are lipo camera batteries with 1000+ mah's that are encased in a hard shell and are even thinner than the lipos we can get for rc ...solder some wires to the battery terminals, seal the soldered section with something like shoo goo and you have a very light and skinny battery....BUT I DON'T RECOMMEND THIS! ...my next project is redesigning the mtx4 tank with the above battery so that the tank is entirely below the top deck
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Old 05-26-2006, 10:06 PM   #30
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here is a picture of a VXR lipo installed in a mtx4 with the regulator mounted on the side. i used xray servo posts.

i sealed up the ends of the regulator with gasket sealant. this stops fuel getting into the chip and makes it waterproof.
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New LiPo receiver pack -- replaces 5-cell packs-img_0273-small.jpg   New LiPo receiver pack -- replaces 5-cell packs-img_0271-small.jpg   New LiPo receiver pack -- replaces 5-cell packs-img_0279-small.jpg  
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