17.5 Brushless Motor opinion
10-13-2008, 03:53 AM
#23
17.5
Would be great to have a site and chart with specs that you can compare all brands of motors including prices.
10-14-2008, 12:31 AM
#24
kid TT-01 tested both nimh and lipo on Friday and he told me nimh was much faster.
He made top 3 in stock NSW on-road state title using nimh. (Top 2 used brushed/nimh combo)
I don’t know why but some reason 17.5 seems to be faster with nimh. I run 10.5 in club race and I find they are faster with lipo. It’s weird but that’s what I found out. It maybe different with off-road but SP 17.5 aren’t slow.
He made top 3 in stock NSW on-road state title using nimh. (Top 2 used brushed/nimh combo)
I don’t know why but some reason 17.5 seems to be faster with nimh. I run 10.5 in club race and I find they are faster with lipo. It’s weird but that’s what I found out. It maybe different with off-road but SP 17.5 aren’t slow.
10-14-2008, 01:07 AM
#25
17.5
Possible reason why 17.5 is faster with Nimh is because a lower power motor needs higher voltage to gain in top speed and draws less amps so there is a higher voltage left in the battery at the end of a race you appear to have a fast finish.
Where a 10.5 you will see a higher current (amps) draw voltage drops sooner with Nimh and you will go slightly slower towards the end of a race - so when you use a lipo (as you state) it is almost constant output voltage so it may seem faster.
My thoughts
Where a 10.5 you will see a higher current (amps) draw voltage drops sooner with Nimh and you will go slightly slower towards the end of a race - so when you use a lipo (as you state) it is almost constant output voltage so it may seem faster.
My thoughts
10-14-2008, 02:13 AM
#26
Possible reason why 17.5 is faster with Nimh is because a lower power motor needs higher voltage to gain in top speed and draws less amps so there is a higher voltage left in the battery at the end of a race you appear to have a fast finish.
Where a 10.5 you will see a higher current (amps) draw voltage drops sooner with Nimh and you will go slightly slower towards the end of a race - so when you use a lipo (as you state) it is almost constant output voltage so it may seem faster.
My thoughts
Where a 10.5 you will see a higher current (amps) draw voltage drops sooner with Nimh and you will go slightly slower towards the end of a race - so when you use a lipo (as you state) it is almost constant output voltage so it may seem faster.
My thoughts
That seems to be the current thinking of a lot of the 17.5 runners
10-22-2008, 01:50 AM
#27
I run the Losi 17.5 motor and esc, i found it very fast and easy to gear and it doesnt heat up as much as what ive heard about other motors, i run it in my xx4 and it still didnt get too hot, i ran it at the NSW off road states and TQ'd stock truck and 4wd stock, with many people remarking my truck was probably the quickest in a straight line
10-22-2008, 03:40 AM
#28
i was running 76/27 which gives an FDR of 6.47 which after reading a bit more and talking to people, is a bit under geared really, but it worked at illawarra because even though its a long track, there weren't many high speed sections (one nice long straight), so the punch out of the corners was noticable when running with others, knowing a bit more now if gearing for a high speed track i'd be going up 3 or 4 teeth
10-22-2008, 03:52 AM
#29
I run my zx-5 @ 5.5 fdr, 76 spur 34 pinion. I will be moving to a 72 spur soon and perhaps a 35/36 pinion. I know one guy who is running his novak 17.5 @ 4.9 fdr so there is room for play.
10-22-2008, 04:01 AM
#30
yeah good call, from what ive read, the 2wds are looking around 4.9-5.4 fdr, and 4wd having the same tyres are being geared around the same, it varies between motors, it depends on how much cooling you've got etc, i suppose because its all pretty new, gear them a bit conservative and check temps after each run and gear up gradually