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Old Jul 20, 2005, 07:40 AM
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Old Jul 20, 2005, 08:15 AM
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Bill Glover's Avatar
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Quote:
Originally Posted by Numb Thumbs
Actual figures, after abit of dremel work (I feel like a dentist!):

7x4 APC : 1080 grams thrust / 10,000 RPM / 15 amps

It is a 1 to 1 trust to weight ratio now. And I am saving a heap of amps!


Thrust to weight is "adequate" but 10k rpm with 4" pitch props gives a pitch speed of only 38 mph, which is maybe a little low.
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Old Jul 20, 2005, 09:02 AM
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Which Cam Slim Prop Size ?

Hi Juergen,
i would like to upgrade my TS2 the same way like you did, witch Graupner Precision spinners, 480 Motors and cam slim props.

Which size would be better 6x3 or 6.6x3 ? Did you use 6x3 whith your aerial pics ?

Regards, Foamboy
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Old Jul 20, 2005, 01:45 PM
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53859 Niederkassel, Germany
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Quote:
Originally Posted by foamboy
Hi Juergen,
i would like to upgrade my TS2 the same way like you did, witch Graupner Precision spinners, 480 Motors and cam slim props.

Which size would be better 6x3 or 6.6x3 ? Did you use 6x3 whith your aerial pics ?

Regards, Foamboy
I used the 6.6x3".

Jürgen
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Old Jul 20, 2005, 03:27 PM
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Joined Jun 2002
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I flew mine with an 8 x 3600 Nimh pack on sunday. Made a HELL of a difference with the extra cell, great aerobatics and much faster than the old twinstar. Had 2 launches off the 3600 battery, and almost 20 minutes off the one pack!!! If anyone wants a pack of these, they are Jamara 8x3600Nimh from Als Hobbies for £21.95 a go.
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Old Jul 20, 2005, 03:28 PM
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Quote:
Originally Posted by maverick6
Hello !!
Here is my twinstar 2 : http://img301.imageshack.us/my.php?i...tar20030qe.jpg
It it weighs approximately 1350g with my 8/kan2000 pack.
Strange

Your battery pack weighs about 60g less than mine, yet your model is approx. 50g heavier than mine.

Jürgen
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Old Jul 20, 2005, 04:37 PM
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it weighs "approximately" ( + or - 30g )
my receveir weighs 50g ( it's an old receveir ) and my 8/kan2000 pack weighs 360g.
???
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Old Jul 21, 2005, 11:52 PM
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I hope "Numb Thumbs" read my warning about the BEC ?!

Jürgen
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Old Jul 22, 2005, 12:41 AM
Does it come in Flouro??
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Melbourne, Australia
Joined Sep 2004
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Jurgen

Thank you, your advice is always gratefully accepted!

What symptoms should I see?

I will probably go to two Castles 25's?? Cheap sport this one.....

I'm still playing around on the bench with props at present, not flying it. 7x4 or 7x5 seems to be the best spot, 1080 and 1200 grams thrust static. What do you think about prop pitch speed on a 7x4 at 10000 RPM or 7x5 at 9300 RPM??

Cheers

Numb Thumbs
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Old Jul 22, 2005, 02:32 AM
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Quote:
Originally Posted by Numb Thumbs
I will probably go to two Castles 25's??
You might want to look at this thread first ... it's rather big so I'd skim-read the last few pages:

http://www.rcgroups.com/forums/showthread.php?t=354845

Re. pitch speeds, as mentioned before 7x4 at 10k is 38 mph. 7x5 at 9300 is a bit better at 44 mph.
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Old Jul 22, 2005, 03:03 AM
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Ireland
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Twinstar II or Magister?

I am thinking about my first aileron plane. Have flown the Easystar and the Bleriot III and I'm looking at the above two models as my choice (the Magister as an electric setup). I want a good aileron trainer and an all round good performer. From Jurgen's video the TSII looks excellent, however in FMS I prefer the Magister to the TSII as it seems to perform basic aerobatics better. Has anyone flown both in reality and what are the relative merits of both? Is landing gear a plus from a training point of view? (A lot of people in my club seem to have problems properly landing gas planes with landing gear on grass-tipping over, tip stalling etc).
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Old Jul 22, 2005, 03:24 AM
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Polesworth, Warkwickshire (UK)
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Hi guys,

Even thought the TwinStar II flys great on the stock power system and props, I found a gearbox which will fit the motor mounts. It's an Irvine Maxx 400 Gearbox, comes with 3:1, 2.5:1 and 2.1:1 ratio's plus a prop adapter, oh and it's ballraced too. They cost £12 each from www.inwoodmodels.co.uk

[IMG]C:\DaTA\Media\MAXX GearBox.JPG[/IMG]

The only pair of props I have as the moment are APC 9x6sf so going to try those out with the 3:1 ratio and my 8Cell CBP 3300 pack. The installation is nice, it just bolts straight onto the front of the motor mounts.

[IMG]C:\DaTA\Media\Maxx GearBox INstallaed.JPG[/IMG]

Going to have a test fly this evening, can't wait.
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Old Jul 22, 2005, 03:49 AM
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Polesworth, Warkwickshire (UK)
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hmmm, Dont suppose someone can tell me how to insert images properly into a post, as it didn't appear work in the previous one.

Anyway here are the images of the TwinStar II gearbox on my web site I currently creating

http://ppflyers.jaggs.co.uk/gallery.htm
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Old Jul 23, 2005, 03:49 AM
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Quote:
Originally Posted by Viperkk7
Hi guys,

Even thought the TwinStar II flys great on the stock power system and props, I found a gearbox which will fit the motor mounts.
...
The only pair of props I have as the moment are APC 9x6sf so going to try those out with the 3:1 ratio and my 8Cell CBP 3300 pack. The installation is nice, it just bolts straight onto the front of the motor mounts.
...
Going to have a test fly this evening, can't wait.
A 3:1 gearbox on a Permax 400 and 8 cells is too much for a motor model like the Twin Star. You may get good static thrust with the 9x6" props, but dynamic thrust in flight will decrease rapidly, as the pitch speed is much too slow. You are effectively going from 4" (Günther prop pitch) to 2" (6"/3).

Jürgen
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Old Jul 23, 2005, 04:16 AM
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Polesworth, Warkwickshire (UK)
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I'm no longer using the permax motors, but ultrafly falcon s400, which I have left over from my PC9 and Extra Models. I wanted to use 8x8E props but there still on order from my local model shop. I had a test flight last night with the ultrafly motors and the 9x6sf (as these we the only prop pair I have at the moment). Most of the flight was done at half to 3/4 throttle. It flew well, I had a much longer flight time, and compare to the stock on performance there wasn't much in it, pretty much the same really, nothing that noticeable anyway. One thing I did notice is that everthing was a lot smoother, weather thats because I'm use to the model now I don't know.
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