New LiPo receiver pack -- replaces 5-cell packs
#16
Tech Initiate
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.
Last edited by veesix; 05-24-2006 at 10:35 AM.
#17
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.
#18
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.
Last edited by richey; 05-24-2006 at 06:30 PM.
#20
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
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
#21
Tech Initiate
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?
#23
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
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
#24
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.
#25
cansom1tell me y lipos are so soft???
#26
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.
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.
#27
Tech Regular
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.
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.
#29
Tech Champion
iTrader: (10)
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
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