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Jan 14, 2005, 11:15 AM
Albatros biplane addict
Tobi's Avatar
Question

Airsail's Auster AOP 9 - 620 mm span


I would like to start my first conversion from rubber power to electric scale flight and have selected Airsail's Auster AOP 9 for that project (please see picture below).

Has anyone a "best-practice-solution" concerning a suitable combination of motor/gear/prop? Which RC-equipment and which Lipo should be chosen? Any convenient alternative to tissue covering?

Any advice will be appreciated gratefully. I'll keep you informed about the project progress ...

Thank you very much in advance!

Tobi
Last edited by Tobi; Jan 14, 2005 at 11:20 AM.
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Jan 14, 2005, 07:41 PM
Registered User
CA'ed fingers's Avatar
woooo, nice plane! Where do you get it?

I've just finished my very first conversion and I'm just waiting for my battery to do the maiden. I was lucky enough to have some help so you may want to check out my thread for different advice: https://www.rcgroups.com/forums/showthread.php?t=299222

As for covering, I went with RA Microlight. It's like the big stuff (monolote and all) but thin and light (lighter than jap tissue). I got mine from homefly and also directly from the manufacturer http://www.ramicrolite.com/

I'll let the experts weigh-in on the best combo but I would expect the gear I used (kenway N-20 geared 4:1 with GWS 5030 prop and 145mah and 170mah lipos) would do well? Actually, maybe not enough? yours is 620mm wing span which is much more than mine at 16 inches...

Anyway, you can probably use the Micro Joule combo from Cirrus which I highly recomend...

Let us know how it goes and take lot's of pictures...

eric
Jan 14, 2005, 09:53 PM
Gravity is a harsh mistress.
Tim Wolff's Avatar
Quote:
Originally Posted by CA'ed fingers
I'll let the experts weigh-in on the best combo but I would expect the gear I used (kenway N-20 geared 4:1 with GWS 5030 prop and 145mah and 170mah lipos) would do well? Actually, maybe not enough?
eric
I missed your SE5 power setup in your thread. Are you planning on one or two cells? I have the same combo going into a Walnut Scale Baby Ace. I have some doubts about it on a single cell.

Tobi, So much depends on the AUW of the plane, it's intended flying area and your flying style. Keep any plane light, but it also has to support the RC gear and power system.
Sub 5g servos, a Berg Microstamp 4 RX, Castle Pixie 7p Speed conrtoller and a GWS LPS or IPS power on 2 250-700 mAh lipos would be a good place to start. There are some brushless setups that are light enough for a plane that size too.
Last edited by tiberius; Jan 14, 2005 at 10:01 PM.
Jan 17, 2005, 04:04 AM
Albatros biplane addict
Tobi's Avatar
Hallo CA'ed fingers & tiberius,

thank's a lot for the reference threads as well as for the suggestions concerning the equipment to be used. I'll ckeck that out. Now that you want me to take lots of pictures I finally have a reason for buying a digi cam ... ;-)

CA'ed fingers,

you can order the kit directly at http://www.airsailmodels.co.nz/produ...art_no=10-AOP9

But it should also be available at homefly etc.. If it is not possible to obtain it overseas I'm going to send you one from Germany within a few days. Look at http://www.jamara.de/d/start.shtml, for instance.

I'll post some pictures concerning my progress next week.
Jan 17, 2005, 05:14 PM
Registered User
CA'ed fingers's Avatar
Hi Tobi,

thanks for the links. I'll old-off for now until I get my SE5 in the air. My first kid is due in a month and my girlfriend is diverting some of my RC money to diapers...

Tiberius, I've got 2 cells on mine. According to Mike, I should get around 40g of thrust. Should be ok in a 60g plane...

eric
Jan 18, 2005, 12:20 AM
Time wounds all heels.
Some of those free flight rubber power kits from Airsail are yummy. Very unusual kits, and would make really nice scale projects.

I might have to get the Piper Tomahawk.



this one is pretty swank too...


Jan 18, 2005, 04:21 AM
Albatros biplane addict
Tobi's Avatar
Hi Watersharer,

I've just bought them both and can recommend the kits. Simple, but okay. Would like to start assembling them immediately ... . It's a pity that there are more models than time and money in the world, isn't it? ;-)

Tobi
Jan 18, 2005, 06:48 AM
Registered User
Hello i am Ivan from Italy,where i can buy this model in Germany?Thanks
Jan 18, 2005, 07:52 AM
Albatros biplane addict
Tobi's Avatar
Ivan,

http://www.jamara.de/d/start.shtml, for instance.

Tobi
Jan 18, 2005, 08:17 AM
Registered User
hi

I have the piper tomahawk
i started the other day and have completed the tail group
so far it has been a good build but the quality of the wood has put me off a bit. the weight and strength of some identical parts (fuse formers, ribs) differ too much for my liking and the quality of the precut parts, most of the edges are crushed.
other than that a good kit

james
Jan 18, 2005, 08:38 AM
in persuit of low wing loading
Gordon Johnson's Avatar
Quote:
Tiberius, I've got 2 cells on mine. According to Mike, I should get around 40g of thrust. Should be ok in a 60g plane...
That's about right. At 7.0 volts I get 38g static thrust with the N20-HV and 4.2:1 gearing and a GWS 5x3 prop.

Gordon
Jan 18, 2005, 08:43 AM
Gravity is a harsh mistress.
Tim Wolff's Avatar
Quote:
Originally Posted by Gordon Johnson
That's about right. At 7.0 volts I get 38g static thrust with the N20-HV and 4.2:1 gearing and a GWS 5x3 prop.

Gordon

Edit: Found some single cell data on the Kenway geared N20. Dosen't look good for my application. 3.7v 20.5g thrust with the 12 cm blue prop.
Last edited by tiberius; Jan 18, 2005 at 08:48 AM.
Jan 18, 2005, 09:10 AM
in persuit of low wing loading
Gordon Johnson's Avatar
The problem with the N20-LV is it's really more of a medium volt motor and is happier for our applications at about 5 volts. You can run it on two cells at 7V if not geared too high or propped too high. Eventually the motor will begin making funny noises.

Unfortunately, because it is more of a medium volt motor at 3.5 volts it doesn't put out much power. You can see this by looking at the table on my site.
http://home.comcast.net/~gordon-john...rconstants.htm
The N20-LV only puts out 1.08W of output power at max power rpm, compared to the M20-LV which puts out 1.55W of output power when propped at its max power rpm.

Notice that the N20-LV at 7.0V puts out 4.4W compared to the (no longer available) M20-MV's 4.9W.

The values for the N20-HV are not in the table as I've not got around to doing them yet. I need to get a new N20-HV from Kenway to compare to the one I got from GWS. I just need more "roundtuit" time.

Gordon
Jan 18, 2005, 10:35 AM
Gravity is a harsh mistress.
Tim Wolff's Avatar
Thanks Gordon! This is very off-topic here and should be in the Cookup thread as it concerns my Baby Ace
Jan 25, 2005, 06:42 AM
Albatros biplane addict
Tobi's Avatar
Hi Folks,

I promised to keep you informed about the project progress. Well, I'm going to post some pictures of the tail and fuselage frame construction after the tomcat ate the elevator last night. Don't worry, HE's fine ...

Thank's a lot again for your hints concerning both a suitable motor/gear/prop combination and on RC-equipment.

After going through some English/French/German magazines and comparing the products, being easily available here in Europe, with the solutions you recommended I am finally opting for a combination, as follows:

Motor:
Micro DC 5-2.4 + gear 1:8; mass 12,5g
http://www.wes-technik.de/English/propulsi.htm

or (even better?):

RS LRK Motor (195.03 slo); mass 11 g
http://www.rs-e-motoren.de/index.php?go=news

Microcontroller :
High-Frequency-Controller; HF100; mass 0,9 g
http://www.wes-technik.de/English/controller.htm

Kokam Lithium-Polymer Cells:
3 x Kok 360 HD/360mAh; mass 9 g (each)

Prop:
Carbon 16/12cm; mass 1,2g
http://www.wes-technik.de/English/propeller.htm

Micro-Receiver:
JLC1.6-JST Receiver with 5JST sockets, aerial and Micro Crystal; mass 1,9 g
http://www.wes-technik.de/English/receiver.htm

Light Servos:
LS-2.0; mass 2 g
http://www.wes-technik.de/English/light_ng.htm

All in all this would make up a total mass of 47,5g (46,0 g).
What do you think about it? Any comments are appreciated. Well, nevertheless, I hope I'm not wrong in this forum, because my whole stuff isn't really "Micro or Indoor" ...?

Tobi


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