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Old Jul 26, 2005, 01:53 AM
Does it come in Flouro??
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Melbourne, Australia
Joined Sep 2004
721 Posts
Jurgen

Thanks, that is EXCELLENT information!!!

Looks like 6x6 it is!!!

How does one determine the CI numbers??

I am truely facinated by this new calculation!

Thanks
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Old Jul 26, 2005, 03:50 AM
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Weilbach, Germany
Joined May 2001
2,467 Posts
Quote:
Originally Posted by Jurgen Heilig
When you "play around" with EZ-Calc (8 cells, 6x3") you get the following figures:

Turbo 450, 7.2V - 16551rpm - 71.4% efficiency
Jürgen

That's incredible efficiency for a brushed motor operating above its nominal voltage !

My idea of using the the 8.4v LRP Zenit was to get higher efficiency by operating it closer to its nominal rating (as compared to a 6v or 7.2v can 400). An extra 21g 'well spent', in my opinion.
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Old Jul 26, 2005, 06:47 AM
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Belgium
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Gaelic flyer

I am not too sure it would be easy to fit standard size servos inside the TS II fuselage. The moulded pockets have been designed for perfect drop-in MPX Tiny S servos, apparently (or so it seems to me) with a lot of consideration for space management. Problems might come from control rods position relative to servo arm position with higher servos, also from available space in which to house the battery pack between wider servos.
Concerning the one stick eight cells pack, weight would be alright but perhaps it might prove difficult to move the pack sufficiently forward or backward to hit the right CG spot.

Various : I think 5x5 black 'hard' Gunther props (on 8 cells) will rev too high and draw too much on 480 motors which are an option precisely retained to benefit from a higher torque and a lower current draw. They would be an improvement on the white ones on 400 motors. My electric specialist also tells me 450 motors will draw a lot of current, not an interesting solution.
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Old Jul 26, 2005, 10:52 AM
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Staffordshire, England
Joined Aug 2004
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Hi folks,

Could anyone tell me which is the better choice for 7/8 cells with the white gunthers standard 6v or 7.2v s400?
Called into Punkies today (ModelSpot), came back with a nice new TS11.
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Old Jul 26, 2005, 10:52 AM
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And a Cargo
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Old Jul 26, 2005, 12:02 PM
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53859 Niederkassel, Germany
Joined Sep 2000
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Quote:
Originally Posted by ChrisP
Jürgen

That's incredible efficiency for a brushed motor operating above its nominal voltage !

My idea of using the the 8.4v LRP Zenit was to get higher efficiency by operating it closer to its nominal rating (as compared to a 6v or 7.2v can 400). An extra 21g 'well spent', in my opinion.
Hi Chris,

High voltage - within reason - is always good for efficiency. The Turbo 450 has its max. efficiency at approx. 10A, while the Permax 400 peaks at approx. 4A (at 10A their efficiency is down to approx. 50%!). Nominal voltage is not important - it is Amps you have to worry about.

Jürgen
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Old Jul 26, 2005, 12:05 PM
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53859 Niederkassel, Germany
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Quote:
Originally Posted by Scramble
...
My electric specialist also tells me 450 motors will draw a lot of current, not an interesting solution.
Your "electric specialist" is obviously not an expert.

Jürgen
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Old Jul 26, 2005, 12:42 PM
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Pleasant Hill, Missouri
Joined Jun 2004
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Does the Twinstar 2 have any flying problems? As I recall the original Twinstar had some problems with the motors being aimed too far up.
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Old Jul 26, 2005, 02:05 PM
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United Kingdom, Bracknell
Joined Nov 2000
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Quote:
Originally Posted by Crazyrcer
Does the Twinstar 2 have any flying problems? As I recall the original Twinstar had some problems with the motors being aimed too far up.
The upthrust on the TS1 doesn't cause any problems, it's just there to make hand launches even easier. I removed it from mine when I fitted geared motors and it made no difference in flight whatsoever (I never hand launch my TS).
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Old Jul 26, 2005, 03:32 PM
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53859 Niederkassel, Germany
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Maidened my TwinStar II with a 2s1p Kokam 3200 this evening. New RTF is now 1070g (37.75 oz). Max. static current of the two Permax 400 with CAM 5.5x4.3" is approx. 24A.

I made three flights with one charge - total flight time 20 minutes - with plenty of aerobatics. When the ESC indicated that the battery was getting empty, I still had the feeling of plenty of power left, but recharge took 3066mAh.

20 minutes with 3Ah means 9A average, i.e. 4,5A per motor - nice setup.

How does the TS II perform with Lipos? Very agile - best compared to an A-10 "Warthog". Also the glide rate is fantastic - almost like a glider - glad that I've got spoilerons.

I have to get Jim to do some video.

Jürgen
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Old Jul 26, 2005, 03:57 PM
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And a cargo


Sooty went shopping!
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Old Jul 26, 2005, 09:42 PM
Registered User
USA, CA, San Francisco
Joined Feb 2004
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Quote:
Originally Posted by Sooty100
Hi folks,

Could anyone tell me which is the better choice for 7/8 cells with the white gunthers standard 6v or 7.2v s400?
Called into Punkies today (ModelSpot), came back with a nice new TS11.
Absolutely the 6v motor; the 7.2v motor is lacklustre on anything under 9 cells (or 3s lipo).

= Mike
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Old Jul 27, 2005, 02:11 PM
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53859 Niederkassel, Germany
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Got a second Permax 450 Turbo today. Before I change motors, I will do some static testing - Permax 400 versus Permax 480 versus Permax 450 Turbo - at various voltages. Might take some time, as I will be at the E-Meeting in Rothenburg, Bavaria this weekend.

Jürgen
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Old Jul 27, 2005, 03:42 PM
elaporaholic
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Staffordshire, England
Joined Aug 2004
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Thanks Mike,

Ill go with the stock 6v then with a totally stock build. Any nasties I need to look out for Jurgen during the build?

TT,
its a good job Punkies were waiting on a shipment of EZ Stars (they only had the ARF version inc. radio) Im selling my gliders to please my credit card.
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Old Jul 28, 2005, 12:17 AM
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53859 Niederkassel, Germany
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Quote:
Originally Posted by Sooty100
Thanks Mike,

Ill go with the stock 6v then with a totally stock build. Any nasties I need to look out for Jurgen during the build?
The only change I did was shortening the outer tubes of the rudder linkage by 5mm and mounting the rudder horn connector upside down (you need to shorten the hex key to get to the scrub scew then).

Jürgen
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