Lipo vs Brushless

Sounds like two different things.  How do you compare?  But they are both new technology, and both very expensive.  If you want to upgrade one at a time, which one will you buy first?

Want speed first then power ---->  Brushless

Want power (long run-time) then speed ----> Lipo

Make more sense now?  Yeah, the charger too if you vote for Lipo

lipo gives you speed as well....because it's lighter

原帖由 銅鑼灣大帝 於 2006-10-24 12:37 發表
lipo gives you speed as well....because it's lighter

What kind of run time can you get out of Lipo?  That guy at the hobby shop said 30-40min for 19T motor (1 charge)

原帖由 GigaRacer 於 2006-10-25 04:40 發表



What kind of run time can you get out of Lipo?  That guy at the hobby shop said 30-40min for 19T motor (1 charge)

i dont use lipo
but the guy sounds reasonable.....lipo generally have capacity over 4000mAh, it's reasonable that it can last 30-40mins for 19T...even my GP3300 can last around 40mins for silver can.

Yeah, but my 3800 only have 6-7min with 19T

一定係買BRUSHLESS先.

锂电寿命太短，属易耗品，平时玩不合算。

無刷馬達是未來趨勢，今年ISTC開放無刷可以參賽，成績雖然不是很好，但是決賽也有2台無刷車車。不過，目前還是高單價物品，希望未來能更加平價。
至於鋰聚電池：個人是認為還早，以現今比賽規格與鋰電的能耐來說。
1.車重限制，鋰電的優勢是輕，這點在比賽中完全不合規格。
2.高放電量，隨便以MC-330來說，前進200A後退100A，拿個最高級的20C放電的鋰電來算，你得用10A/H的鋰電才夠用----10000mA的鋰電會比4200mA的鎳氫電池輕嗎？
好就算你有10000mA的鋰電，請注意一下，現在鋰電充電建議用1C來充，以免電池被充壞。也就是每顆電池要充一個小時。
沒錯10000mA的鋰電是可以玩很久，但是這顆電池的售架足夠你買5棵4200MA的鎳氫電池。

原帖由 龍崗小吳 於 2006-10-25 23:59 發表
2.高放電量，隨便以MC-330來說，前進200A後退100A，拿個最高級的20C放電的鋰電來算，你得用10A/H的鋰電才夠用----10000mA的鋰電會比4200mA的鎳氫電池輕嗎？
好就算你有10000mA的鋰電，請注意一下，現在鋰電充電建議用1C來充，以免電池被充壞。也就是每顆電池要充一個小時。
沒錯10000mA的鋰電是可以玩很久，但是這顆電池的售架足夠你買5棵4200MA的鎳氫電池 ...

200A只係電變最大可承受電流, 唔代表隻摩打全程都用緊200A, 如果唔係用一排4200mA唔洗一分鐘就玩完?? 20C絶對唔係一個細數目, GP NiMH 都係講緊10C...

原帖由 cowcowlee 於 2006-10-26 15:07 發表


200A只係電變最大可承受電流, 唔代表隻摩打全程都用緊200A, 如果唔係用一排4200mA唔洗一分鐘就玩完?? 20C絶對唔係一個細數目, GP NiMH 都係講緊10C...

當然不是全程都是用200A在跑，而是最大瞬間，但是你的鋰電如果無法放到這個電量，那你的起步會很沒力。還有鋰電池會過度放電，可能玩沒幾次就掛了。
另外，MC-330只是一般電變，拿棵競賽級的電變來看，
例如TAMIYA VOLAC MS ESC
瞬間最大電流 : 3120A
連續最大電流 : 780A
那要多大棵的鋰電呢？？？

其實，若是以未來發展------>無刷+鋰電來說的話，未嘗不是不可能。
前幾期日本雜誌曾用3CELL--3.6V+無刷馬達來跑1/10電房車，結果與現今最熱門的搭配法--->23T碳刷馬達+7.2V鎳氫來比，單圈時間差不多。
這樣看來，無刷馬達在較低電壓時也能有所發揮，而3CELL鎳氫當然比原本7.2V6CELL要來得輕，如果使用1CELL的鋰電3.7V來跑ㄧ定更加的輕快啦！

It took almost 2 years for brushless technology to be mature and popular as today. Lipo may follow the same trend. I think lipo technology at the moment is still too new. It is reasonable to expect lipo with much better quality and price to be available in the next 1 year or so.

I think one of the points we don’t have to mention is Li-po is not approved by racing organization such as IFMAR, ROAR...etc.
The main advantage of Li-po is light weight and/or longer run time than Ni-mh. If we are using Li-po but compare or fulfill current racing rule, WHY still consider of using Li-po? The price of Li-po is not cheap even expensive than NiMH but slightly shorter life even using with care.
IMO, only if the racing rule is revised or on fair ground, for example, the min weight is reduced to a suitable level, such as 1300 g – 1350g or  lower, and the race duration revised to 10 – 20 minutes without reducing speed , or this may be a suitable time to discuss pros and cons of Li-po and NiMH.

[ 本帖最後由 Concept 於 2007-9-20 12:10 編輯 ]

li-po has 50C now.....not a news...

One additional advantage of the brushless system is its performance is less dependent on the conditions of battery. So, the performance provided by brand new top end matched battery and the performance provided by conventional battery become closer.

Only change the brushless system can improve a lot already. such as prower and running time.

Brushless motor first

原帖由 龍崗小吳 於 2006-10-25 23:59 發表

                               
登錄/註冊後可看大圖

無刷馬達是未來趨勢，今年ISTC開放無刷可以參賽，成績雖然不是很好，但是決賽也有2台無刷車車。不過，目前還是高單價物品，希望未來能更加平價。
至於鋰聚電池：個人是認為還早，以現今比賽規格與鋰電的能耐來說。
...

不好意思,第二點不太明白,可以解釋一下20C 即是多少A 呢??

如果你舊li-po 係5000mAh 20C的話, 1C=5000mA=5A 20C=100A

唔講性能,市潰D講,brushless可以話係一件省錢的産品,至少你少咗買銅頭機果份錢.
同時亦都方便咗好多
而lipo係屬于注重performence既進階産品.
以現時黎講依然有好多唔完善既地方,最基本的,價格,分分鐘係NIMH既2-3倍
so,我都係brushless first.
lipo都係要霖霖,一味追潮流未必係件好事