LiPo: shorty pack vs. standard packs
#1
LiPo: shorty pack vs. standard packs
I need to shave weight off my rc. I have come to the conclusion that the battery is really my last option. I have looked into different options and what "feels" best is a shorty pack.I checked the ROAR rules and it only states "maximum" dimension, not minimum.
The maximum dimensions are:
Length: 139mm +0mm/-3mm
Width: 47mm +0mm/-2mm
Height: 25.1mm +0mm/-3.0mm
What are the benefits/drawbacks to running a shorty pack? I am running RCGT, and 7.5R just for fun.
The maximum dimensions are:
Length: 139mm +0mm/-3mm
Width: 47mm +0mm/-2mm
Height: 25.1mm +0mm/-3.0mm
What are the benefits/drawbacks to running a shorty pack? I am running RCGT, and 7.5R just for fun.
#2
I need to shave weight off my rc. I have come to the conclusion that the battery is really my last option. I have looked into different options and what "feels" best is a shorty pack.I checked the ROAR rules and it only states "maximum" dimension, not minimum.
The maximum dimensions are:
Length: 139mm +0mm/-3mm
Width: 47mm +0mm/-2mm
Height: 25.1mm +0mm/-3.0mm
What are the benefits/drawbacks to running a shorty pack? I am running RCGT, and 7.5R just for fun.
The maximum dimensions are:
Length: 139mm +0mm/-3mm
Width: 47mm +0mm/-2mm
Height: 25.1mm +0mm/-3.0mm
What are the benefits/drawbacks to running a shorty pack? I am running RCGT, and 7.5R just for fun.
There's no loss of performance compared to a bigger pack; did some tests this week comparing a Reedy shorty lipo against a 5800mah 60C pack and the speed and current were identical (with 13.5 boosted motor).
#3
Also depends on your car too. If you have a car with the pack mounted either on the left or right side, it will affect weight balance too. Of course, if the pack runs down the middle, then you have the advantage of distributing the weight around to suit driving conditions.
I'm looking at getting a shorty lipo for one of my F1 cars to not only allow room for electronics, but for a more rear weight bias to increase rear grip on a 2WD car.
I'm looking at getting a shorty lipo for one of my F1 cars to not only allow room for electronics, but for a more rear weight bias to increase rear grip on a 2WD car.
#4
Also depends on your car too. If you have a car with the pack mounted either on the left or right side, it will affect weight balance too. Of course, if the pack runs down the middle, then you have the advantage of distributing the weight around to suit driving conditions.
I'm looking at getting a shorty lipo for one of my F1 cars to not only allow room for electronics, but for a more rear weight bias to increase rear grip on a 2WD car.
I'm looking at getting a shorty lipo for one of my F1 cars to not only allow room for electronics, but for a more rear weight bias to increase rear grip on a 2WD car.
#5
Fatties rule
Why the fascination with weight cutting? My limited experience shows light cars don't handle very well road racing...
#7
Unbalanced
Most race tracks have a high-speed sweeper at the end of the straight. Loading the inside of your car, a la offset Sprint Cars, improves control and keeps your speed up. Plus there will be many more turns in that same direction. Slower infield turns don't shift the weight so hard, so aren't effected as much by imbalance. No charts or graphs, but experience says a 50/50 side-to-side balance is often not the fast way to go...
#9
Ahh, yes.
#10
Tech Master
Most race tracks have a high-speed sweeper at the end of the straight. Loading the inside of your car, a la offset Sprint Cars, improves control and keeps your speed up. Plus there will be many more turns in that same direction. Slower infield turns don't shift the weight so hard, so aren't effected as much by imbalance. No charts or graphs, but experience says a 50/50 side-to-side balance is often not the fast way to go...
A lighter car will also accelerate faster out of the turns and brake better going into the turns. Suspension adjustments can be made to adjust for a lighter chassis. If a heavier car was the better option then we would have maximum weight limits not minimums
#11
Most race tracks have a high-speed sweeper at the end of the straight. Loading the inside of your car, a la offset Sprint Cars, improves control and keeps your speed up. Plus there will be many more turns in that same direction. Slower infield turns don't shift the weight so hard, so aren't effected as much by imbalance. No charts or graphs, but experience says a 50/50 side-to-side balance is often not the fast way to go...
A car takes about 0.5s to get round a sweeper, and 13s to get round the rest of the lap, so I'm going to optimise it for the 13s chunk, not the 0.5s chunk.
#12
Tech Fanatic
iTrader: (8)
Disagree. I want my car to pull straight on the power and under braking, which requires a 50/50 split. I want it to handle the same on LH and RH corners, which requires a 50/50 split.
A car takes about 0.5s to get round a sweeper, and 13s to get round the rest of the lap, so I'm going to optimise it for the 13s chunk, not the 0.5s chunk.
A car takes about 0.5s to get round a sweeper, and 13s to get round the rest of the lap, so I'm going to optimise it for the 13s chunk, not the 0.5s chunk.
#13
Tech Addict
iTrader: (2)
hm.. i thought a slightly heavier rear end would do some good? right now my car is 50.25% rear that translates to 21g heavier at the back, and it handles superbly without losing rear traction even in the tightest turns. These shorty packs are worth a try on my old school 414 type TC to cut weight.
F/R has more to do with driving style and personal preference. My JRXSR is almost 54/46 the way I have it laid out, but I would imagine I could get it much closer to 50/50 if I wanted.
#14
#15
Tech Master