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Old Oct 26, 2010, 02:51 PM
Registered IGG Finland pilot
Hannu Vuorinen's Avatar
Finland IGG-FIN
Joined Feb 2003
680 Posts
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Indoor Aerotow

Hello fellas!

Once outdoor aerotow season is now ending here in Nordic,
we experimented little bit transferring that great fun into Indoors
also, so here we go, Indoor aerotow:

Lahti Fly indoor - small scale aerotow (1 min 19 sec)


and towing 2 gliders at once:

Lahti Fly indoor - dual small scale aerotow (2 min 14 sec)


Tow plane is CC Lee Cessna -conversion with Parkzone technic, AUW apprx 40g.
Gliders are apprx 100 cm region wingspan

Best regards,
Hannu
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Old Oct 26, 2010, 03:19 PM
Storm Runner guy
Slider2732's Avatar
USA, OK, Muskogee
Joined Nov 2008
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Ha excellent !!!
I can imagine heating vent thermal riding too in winter. What a wonderful sight, so very different and graceful
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Old Oct 26, 2010, 03:41 PM
Registered User
United States, AZ
Joined Aug 2004
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Very cool!
We do something similar at our field, but there isn't that much interest in it.

What you have done is great! Thank you for posting it,
Ryan
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Old Oct 26, 2010, 04:08 PM
del
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north of Chicago
Joined Feb 2003
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Beautiful!

Can you show us the details of your tow release mechanism?

--del
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Old Oct 26, 2010, 05:20 PM
Registered IGG Finland pilot
Hannu Vuorinen's Avatar
Finland IGG-FIN
Joined Feb 2003
680 Posts
Hello,

well, there is not much in release mechanism, it is just a pin, where towline is attached. Once glider is turning " in" and tug "out", it releases towline from pin.

So far, it looked to be working just ok

BR,
Hannu
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Old Oct 26, 2010, 05:54 PM
del
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north of Chicago
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Quote:
Originally Posted by Hannu Vuorinen View Post
Hello,

well, there is not much in release mechanism, it is just a pin, where towline is attached. Once glider is turning " in" and tug "out", it releases towline from pin.

So far, it looked to be working just ok

BR,
Hannu
Thanks for the info, Hannu,

From what I can see, I presume that you are using rudder and elevator. Is that true?

This year at the KIEF model meet some friends tried indoor aerotow. It was not successful. The glider was not stable in yaw or roll while on tow. Do you have any suggestions?

--del
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Old Oct 26, 2010, 07:49 PM
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Minneapolis, Minnesota
Joined Jul 2007
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I'd like more information on the glider! Size, AUW, construction, possibly some 3-views?

Jay
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Old Oct 26, 2010, 11:00 PM
Registered IGG Finland pilot
Hannu Vuorinen's Avatar
Finland IGG-FIN
Joined Feb 2003
680 Posts
Hello!

Here is some basic specs for Indoor aerotow we used:

Towplane:

-Flying speed as low as possible, needs good static thrust
-Wingspan max 80 cm
-Motor + radio technic for example from ParkZone/Mustang/Sukhoi,
on video towplane is freeflight CC Lee Cessna Rc- conversion with Parkzone
technic inside. We used succesfully also RTF Nine Eagle Cessna in Lahti Indoor event.
-all up weight 40 grams is Ok to tow 100 cm wingspan glider with AUW 40g
-only rudder+elevator is enough for controls

Glider:

-100 cm wingspan seems to be quite good one, scale is approx 1:15
-Profile models, plate type wing, with slightly curved type airfoil
-material used was depron insulation plate, 3mm thickness
-keep it light
-wingload is apprx 3-5g/dm2
-only rudder/elevator control is enough
-tow release servo is not needed, just pin for tow line attachment

This was just our 2nd test for Indoor aerotow, so lets see later on where
"development" leads.

Best regards
Hannu
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Old Oct 27, 2010, 02:48 AM
Registered User
Kouvola Utti, Finland
Joined May 2003
154 Posts
Hello guys,

Here comes more info.

Some specs from Ka6e as shown on the second video and two pics on few message above.

Scale 1:15 with no cheating on any surface areas. All material used is 3mm Depron to wing and 6mm to fuselage.
Wing has no spar or anything else strenghtening, just curved slightly.
I glued piece of 0.8x3mm carbon rectangular rod to bottom of the fuselage for strenghtening it.
Lightened Spektrum AR6100, RC1 servo 2pcs, 135mAh 1s Lipo. 1mm carbon tubes for the pushrods with 0.5mm piano wire ends.
All up weight is bit less than 22grams.

I will built new wings with different airfoil and slightly enlarged wing area.

You can find some vintage glider 3-views here: http://www.scalesoaring.co.uk/VINTAG...mentation.html

Now I have on my workbench Finnish designed PIK-15 tow plane project - of course 1:15 scale! EPP fuselage and wings, depron tail surfaces. AUW target is approx. 40g...

BR,
Kimmo
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Old Oct 27, 2010, 05:57 AM
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Elmhurst, NY (Queens in NYC)
Joined Apr 2004
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Wow!

I posted a link in the scale glider forum. Most of those guys think that 1/4th scale is on the smallish side, but I'll bet they like it.

I love the idea, but I don't know any place in NYC where there is indoor flying.

I think I will investigate building something anyway. I am a glider freak. Full sized and models.

Pete

BTW, Scale Soaring UK listed above has a lot of really nice Pathé and Movietone newsreel clips. I think I downloaded around ten or fifteen and also there are some classic old gliding books in PDF format. (Some won't open on my iPad but do okay on my Mac,)
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Old Oct 27, 2010, 07:12 AM
Registered User
Minneapolis, Minnesota
Joined Jul 2007
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In my late 20's I started taking lessons to get my Glider License, but my funds ran about half way through.. Some will probably never understand how piloting a scale model with a Tx can bring the joy and peace of mind you get hanging 5000 feet above ground riding thermals, but I swear, sometimes I feel.. Well, you know..

Jay
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Old Oct 27, 2010, 07:15 AM
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Methuen, MA
Joined Sep 2002
870 Posts
Hannu,

Very nice gliders and video. Thank you for posting all the info. I am building a 30 gram scale glider and hope to get results as good as yours.
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Old Oct 27, 2010, 09:57 AM
Still AWD, Subaru
St.Louis
Joined Nov 2006
884 Posts
those gliders look so graceful

the Rhon Bussard looks perfect for vapor guts...you said you built from 3mm?
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Old Oct 27, 2010, 10:47 AM
Post Digger
Baratacus's Avatar
San Diego, CA
Joined Oct 2005
461 Posts
you should get some really nice hang time with your lightened version that you're building. Most indoor gliders are ultra light weight and can stay up for a really long time, but they wouldn't stand up to being towed like that. Should be a challenge to find just the right ballance.

something slider mentioned about thermals, you might see if they'll let you put a small electric blower over to one side of the room with a deflector so you can have a little up-thermal to grab some altitude.

awesome job on the planes and the execution, and a really simple easy tow release.. I would have completely overcomplicated it.
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Old Oct 27, 2010, 11:18 AM
Registered User
Kouvola Utti, Finland
Joined May 2003
154 Posts
Quote:
Originally Posted by ShawnM4kq View Post
those gliders look so graceful

the Rhon Bussard looks perfect for vapor guts...you said you built from 3mm?
Hi,

Yep, wings and horizontal tail is 3mm depron. Fuselage 6mm depron - two laminated 3mm depron might work successfully.
If AUW is 20g +/-5g, wing should not need the spar. Wing will feel pretty flexible, but will handle well at slow speed. Sure it will bend if speed or weight goes too big. For the test glide it won't need as powerfull throwing like parkflyers. Just a light push.

Our sailplanes have 100cm wing span. Grunau Baby (on the first video) will glide down approx. 0.45m/s which is pretty good from that size glider.

BR,
Kimmo
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