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PostPosted: 03 Aug 2004 11:13 pm 
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Location: Hong Kong
Just my little comment, not to support nor to disagree . . .

1, Fully charged Lipo is 4.3V per cell, so 2s is around 8.6V.

2, Fully charged NiCd/NiMH is about 1.4V per cell, so 6s is 8.4V and 7s is about 9.8V

3, 1 and 2 is based on unloaded condition. When loaded, NiCd/NiMH can maintain the voltage better.

4, Lipo is lighter than NiCd or NiMH.

I think NiCd/NiMH favours the launch stage, while Lipo has lower sinking rate for the glide. Pilot's choice.


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 Post subject: Ah Pong's comment
PostPosted: 04 Aug 2004 01:45 am 
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Joined: 26 Feb 2004 10:52 pm
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Location: Shatin
I received different comments about the rules but we need to make the change as little as possible as some of the pilots has already prepared their plane for the contest.

I do not think LiPo battery has any advantage as it drains lesser current than NiMh or NiCd cells at the same weight. If we allow 3S LiPo, then it will become unfair to those who use 7 NiCd/ NiMh cells. So I do not want to make change on this. In fact, the same contests in other countries also fixed on 7 cells.

Regarding to the spot landing score, the title of the contest need to count both Duration and Spot landing the same weight. So it will be more fair to keep 10 points for both sections. To avoid any player to play trick, I want to reduce to Small circle that give Bonus 5 points. Existing circle is 2 feet diameter, I want to reduce it to 1 feet diameter and add one more rule that if a plane landed in first 40 seconds, "0" score will be obtained. See below:

6.3 降落點得分之計算方法為量度降落點與飛機停定後之機鼻之距離。5米以外得零分﹔5至4米得1分;4至3 米得2分;3至2米得3分;2至1 米得4分。如距離為0至1米,可得5分, 若距離在半呎內,會另加額外5分,即共得10 分。任何飛機不得在起飛後40秒內降落,否則降落點得分作零分算。

Please comment.

Ken


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 Post subject:
PostPosted: 04 Aug 2004 09:50 am 
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Joined: 03 Mar 2004 07:31 pm
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:) Ken and CM,
Thanks for your valueable comments. I shall make some modification on my Ele-Easy then.
Regards,


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 Post subject:
PostPosted: 05 Aug 2004 02:11 pm 
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Ah Pong wrote:
:) . . . I use a double ball bearing with a stator of 8mm thick. N45 magnet, 0.4mm wire at 17 rounds. This BL is the most powerful that I have ever made. :)


Hi Ah Pong,

I've just removed the motor from a CDROM. The thickness of the stator is only 4mm. Are you using two stators stacked together?


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 Post subject:
PostPosted: 05 Aug 2004 05:05 pm 
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Quote:
I've just removed the motor from a CDROM. The thickness of the stator is only 4mm. Are you using two stators stacked together?

:? :) Hi CM,
The method you've mentioned is called 'double-decker'.The difficulty in making a double-decker is when you stacked two identical stators together, the bell (or so-called can) could not cover the stator completely, and thus, wasting energy. I had dismantled 30 odd CD-ROM, and was able to find just one motor having a stator of 8 mm thickness.
Regards, and happy winding.


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 Post subject:
PostPosted: 05 Aug 2004 05:16 pm 
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Hi Ah Pong,

I have another one which is from a 24X CDROM. The motor is a lot more difficult to disassemble and so I don't know the dimension of the stator. However, it has a BIG bell of 10mm height and the stator should be . . . he he :lol:


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 Post subject:
PostPosted: 05 Aug 2004 07:58 pm 
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Joined: 03 Mar 2004 07:31 pm
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:P CM,
Are you going to use homemade BL this time? If you wish to do so, then you better do it quick. As you have to calculate the torque, current and the diameter of prop. Should you need magnets, give me a call. :mrgreen:


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 Post subject:
PostPosted: 05 Aug 2004 09:56 pm 
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Joined: 26 Feb 2004 05:08 pm
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Probably not for not much time left, but will try. My basic plan is the Filip that I used last year.


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 Post subject:
PostPosted: 07 Aug 2004 06:14 pm 
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Joined: 26 Feb 2004 05:31 pm
Posts: 741
Location: 沙田
剛收到消息﹐今次比賽將會有兩位來自珠海同佛山既朋友參加。不如改名粵港電機賽 ﹖


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 Post subject: Strange result
PostPosted: 09 Aug 2004 06:20 pm 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
Strange result yesterday in Pingche:-

2.5M with 500 brushless motor --- > 5 mins.
Ele-easy with homemade brushless motor --- > 6 mins.
Speed 400 with a brushless motor --- > 9 mins.

How to classify? :shock: :?:


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 Post subject:
PostPosted: 09 Aug 2004 06:21 pm 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
CM Cheng wrote:
Probably not for not much time left, but will try. My basic plan is the Filip that I used last year.


What do you think this time after you read the trial result, CM?


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 Post subject:
PostPosted: 09 Aug 2004 06:23 pm 
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Joined: 26 Feb 2004 05:31 pm
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Location: 沙田
尋日坪輋好熱鬧﹐除掟 DLG 外﹐有班機友已經開始為 22 號既電機賽作秘密準備﹐我地同每隻電機計過滯空時間﹐結果出人意表﹗佐治用既超級武器 2.5m Sierra 飛 10 分鐘﹐係冠軍。 阿 Gallant 飛隻全 balsa 制既 0.8m 翼展(大約) F5D pylon racer﹐隻機根本唔係滑翔機﹐ 但竟然可以飛 9分半鐘﹐違反晒地心吸力既定律﹐牛頓死左都比佢激番生﹗但最神奇都要算阿邦隻電 Easy, 佢用最廉價裝置-自製無炭刷摩打+鋰電﹐飛成 6 分幾鐘﹐足以砌低上回電機賽好多人﹐勁﹗睇黎今次電機賽會幾精彩。

坪輋呢個地方已經通晒天﹐尋日同場有好多直升機飛﹐飛滑翔機聽到咁多 Engine 聲﹐真係周身唔自在﹐不過無計。有個村民同隻狗黎睇我地放飛機﹐佢話有班直升機人同D村民租左另外一塊地放機﹐塊地距離我地個度都有幾百米﹐有個小山遮住﹐我地飛個陣都聽到個邊傳過黎既 Engine 聲﹐阿楊仲飛飛下俾人 jam. 比賽個日要事先同個邊D人聯絡下﹐避免撞 band.


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 Post subject:
PostPosted: 09 Aug 2004 10:40 pm 
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Joined: 26 Feb 2004 05:08 pm
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Location: Hong Kong
PatrickYellow wrote:
. . . What do you think this time after you read the trial result, CM? . . .


I'm really bad in thermal flying . . . :oops:


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 Post subject: Re: Strange result
PostPosted: 10 Aug 2004 11:07 am 
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Joined: 26 Feb 2004 10:52 pm
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Location: Shatin
PatrickYellow wrote:
Strange result yesterday in Pingche:-

2.5M with 500 brushless motor --- > 5 mins.
Ele-easy with homemade brushless motor --- > 6 mins.
Speed 400 with a brushless motor --- > 9 mins.

How to classify? :shock: :?:


PatrickYellow,

I think we do not need to make any additional classification on the rules. The spirit of the contest is on testing the flying skills. Both expensive and low cost plane will have chance to win, Control skill, modelling technique and luck are all important. We will play several rounds in the contest (3-5 rounds depends on the number of players) and the same plane must be used in every round. This will avoid player to use hard landing to get higher point in the Spot Landing section.(But every player has one chance to do this)

Stanley is not in HK at the moment so he cannot revise the rule on reducing the spoting diameter from 2 feet to 1 feet. I will have him made the change as soon as possible to below.

6.3 降落點得分之計算方法為量度降落點與飛機停定後之機鼻之距離。5米以外得零分﹔5至4米得1分;4至3 米得2分;3至2米得3分;2至1米得4分。如距離為0至1米,可得5分, 若距離在半呎內,會另加額外5分,即共得10 分。任何飛機不得在起飛後40秒內降落,否則降落點得分作零分計算。

Have you test the Spot landing? Is it easy to get 10 points under the revised rule? If we find any plane that showed to be sure win, we will think about addition Classification to the contest.


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 Post subject:
PostPosted: 10 Aug 2004 11:41 am 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
Hello Ken, I aammmm jooooking about that..... I knew there are not too many ppls here to fly specially to join some contest like this, don't be too serious the class. For the spot landing, it might cause some problems - the grass! If you guys agree, I will bring my grass cutter to try to shorten them down this weekend.


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 Post subject:
PostPosted: 10 Aug 2004 11:42 am 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
I'm really bad in thermal flying . . . :oops:[/quote]

CM, your Filip is good enough I think, just make it as powerful as you can!


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 Post subject:
PostPosted: 10 Aug 2004 06:03 pm 
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Joined: 26 Feb 2004 05:08 pm
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PatrickYellow wrote:
CM, your Filip is good enough I think, just make it as powerful as you can!


OK, put a Tango on it :twisted: . It has been sitting arround for many years. hehe.


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 Post subject:
PostPosted: 10 Aug 2004 06:29 pm 

Joined: 16 Mar 2004 01:06 pm
Posts: 30
Location: Tai Po
[quote="OK, put a Tango on it :twisted: . It has been sitting arround for many years. hehe.[/quote]
CM,
嘩!你落隻Tango咁係咪配隻Jazz ESC 呀! :D


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 Post subject:
PostPosted: 10 Aug 2004 06:34 pm 
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Joined: 26 Feb 2004 05:08 pm
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Location: Hong Kong
[quote="佐治]CM,
嘩!你落隻Tango咁係咪配隻Jazz ESC 呀! :D[/quote]

No, it is Beat. Jazz had not yet come out at that time . . .

Just kidding, with the weight of that motor and the batteries my little Filip simply can't fly. :D


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 Post subject:
PostPosted: 10 Aug 2004 07:09 pm 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
No, it is Beat. Jazz had not yet come out at that time . . .

Just kidding, with the weight of that motor and the batteries my little Filip simply can't fly. :D[/quote]

You haven't read the trial result above, a speed 400 can fly more than 10 mins.,so do your Filip too!!! :roll: just make it as higher as possible!!!! :idea:


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 Post subject:
PostPosted: 10 Aug 2004 07:21 pm 
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Joined: 26 Feb 2004 05:08 pm
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Patrick, you told me to make it "as powerful as I can" !!!!

My Filip is powered by a speed 300, so it can fly for over 10 minutes. :D


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 Post subject:
PostPosted: 11 Aug 2004 12:42 pm 

Joined: 08 Jun 2004 07:14 pm
Posts: 92
Location: TaiPo/TuenMun
I mean not only longer, also can makes the plane get higher...C.M.


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 Post subject: Re: Ah Pong's comment
PostPosted: 14 Aug 2004 12:24 am 
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Joined: 26 Feb 2004 05:08 pm
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Location: Hong Kong
ken wrote:
. . . To avoid any player to play trick, I want to reduce to Small circle that give Bonus 5 points. Existing circle is 2 feet diameter, I want to reduce it to 1 feet diameter and add one more rule that if a plane landed in first 40 seconds, "0" score will be obtained. . .


冇死啦今次 :lol: 忽然諗起屋企有隻叫 "Mini Dixi" 既飛機仔應該可以釣臘鴨,咁就一於釣係塊 landing pad 上面 40 秒,夠鐘關摩打跌落塊 pad 度,10分又袋袋平安 :lol: :lol:

Image


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