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Old Jul 19, 2010, 06:15 AM
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brisbane
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idea's for a real slow indoor model?

HI
The group at indoor is always trying to achieve the slowest flight possible but the plane must fly on the wing, not hover or fly nose up using power to maintain height.
The plane must use commonly available light gear from the likes of hobbyking etc, not tiny micro stuff. We have been flying single skinned under-cambered wings and small brushless motors and weights of 150g ish.
We have a double basket ball hall to fly in so space is good, but always room to improve our designs. Any idea's?


Thanks
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Old Jul 19, 2010, 09:07 AM
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Perth Australia
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hard to improve a design which i havent seen or have any details about but general rules apply , reduce weight and drag , increase lift .
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Old Jul 19, 2010, 11:01 AM
del
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At the risk of seeming to blow my own horn, you might take a look at this thread:

http://www.rcgroups.com/forums/showt...ing+pennyplane

--del
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Old Jul 19, 2010, 11:07 AM
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somewhere i saw a VERY large built up indoor plane that weighed about 7 oz IIRC. it was supposed to fly at just about a walking speed. i'm thinking it was in the 70 inch size range.
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Old Jul 19, 2010, 12:37 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
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The Kolibri design and variants have been around for a long time, probably at least 15 years. It is a CF rod and mylar covering design. Larger sized versions can use conventional mini-servos and equipment. Here's a link to a construction article here on RCGroups from way back.

http://www.rcgroups.com/forums/showthread.php?t=183298

The Kolibri type of design has been built in variations all the way from 4 or 5 grams weight up to several ounces, as well as with actuators and with servos, brushed and brushless. The Parkzone Vapor is actually just a commercial RTF version of a Kolibri (without the V-tail) very nicely done and using their micro servo brick.

Gordon
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Old Jul 19, 2010, 05:41 PM
del
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Quote:
Originally Posted by derk View Post
somewhere i saw a VERY large built up indoor plane that weighed about 7 oz IIRC. it was supposed to fly at just about a walking speed. i'm thinking it was in the 70 inch size range.
Howdy Derk,

That might have been one of Henry Pasquet's, or my, duration models. In those days the rules for duration required that we haul around NiCad's, and the airborne r/c electronics were much heavier. To get models to fly that slow (reduced wing loading) they had to be _huge_..

They did fly slow. But were a pain to build and a bigger pain to transport. The biggest one I built had a wingspan of around 48 inches.

A fun thing to remember, but not something I'd care to do again given more modern equipment.

--del
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Old Jul 19, 2010, 06:13 PM
del
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Quote:
Originally Posted by onlyifamppowered View Post
HI
The group at indoor is always trying to achieve the slowest flight possible but the plane must fly on the wing, not hover or fly nose up using power to maintain height.
The plane must use commonly available light gear from the likes of hobbyking etc, not tiny micro stuff. We have been flying single skinned under-cambered wings and small brushless motors and weights of 150g ish.
We have a double basket ball hall to fly in so space is good, but always room to improve our designs. Any idea's?


Thanks
OK. I admit it...
I just got around to reading your post in detail, rather than just cranking out a quick response...

It's all about wing loading. To fly slow, you make that low. It's as simple as that. You need to tell us more about what sort of wing area your models have. But with even a standard Parkzone brick and drive it's not that difficult to get a model's all-up weight down to under 20 grams.

And, if you really want to fly slow, I'd suggest giving up on brushless motors, and buying idea-rip-off stuff from HobbyKing. Brushed motors are, in general, lighter; and you won't have to haul up an ESC and heavy LiPo's.

--del
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Old Jul 19, 2010, 07:35 PM
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Old Jul 19, 2010, 11:10 PM
RIP Sheba :(
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Brentwood, CA
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As Del said it's all about wing loading. This has got to be one of the slowest RC indoor planes I've ever seen.. Just amazing! Well.. anyway food for thought. May want to reconsider using the small micro stuff.

5YOUKI (2 min 15 sec)
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Old Jul 20, 2010, 04:49 AM
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HI
Thanks to all for the idea's
I was thinking a little bigger then most of the idea's so far.
I know wing loading is the key and we do build fairly light but bigger and a little tougher to survive the mid-air's that always happen at indoor. Cyno and kicker is a pilots best friend at indoor !
I will attach a pic of the sort of model I have in mind. We use brushless motors of the CD Rom size, 2 S lipo of around 350mA and 5 five gram servo's
Just looking for other idea's to share and learn from
Thanks
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Old Jul 20, 2010, 07:14 AM
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Northeastern Illinois
Joined Mar 2009
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Quote:
Originally Posted by onlyifamppowered View Post
...
I will attach a pic of the sort of model I have in mind. We use brushless motors of the CD Rom size, 2 S lipo of around 350mA and 5 five gram servo's
Just looking for other idea's to share and learn from
Thanks
Can you tell us more about that one? Kit, scratch built or what? Any more pics of it?
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Old Jul 20, 2010, 02:20 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
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Quote:
Originally Posted by onlyifamppowered View Post
HI
Thanks to all for the idea's
I was thinking a little bigger then most of the idea's so far.
I know wing loading is the key and we do build fairly light but bigger and a little tougher to survive the mid-air's that always happen at indoor. Cyno and kicker is a pilots best friend at indoor !
I will attach a pic of the sort of model I have in mind. We use brushless motors of the CD Rom size, 2 S lipo of around 350mA and 5 five gram servo's
Just looking for other idea's to share and learn from
Thanks
That's very nice. No need to do a Kolibri type plane if you guys are already flying planes like that.

Here's a very low wing loading plane I'm slowly progressing on. More details can be found in this thread.
http://www.rcgroups.com/forums/showthread.php?t=1232909

Gordon
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Old Jul 20, 2010, 06:26 PM
Playing with AutoCAD!
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United States, ME
Joined Oct 2008
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Can anyone find the pictures and/or videos of those huge jets and other planes that were stick and tissue but flew inside a tiny little gym? I think that they posted sometime last year in the fall or in the summer. I am almost positive that they are in this forum.

-PC49
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Old Jul 20, 2010, 07:00 PM
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USA, OK, Muskogee
Joined Nov 2008
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Is this the thread ?
http://www.rcgroups.com/forums/showthread.php?t=612610
Seems the vids have been removed though....might be on YouTube somewhere still.
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