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Nov 19, 2019, 04:41 PM
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FlyingW's Avatar
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Discussion

Slow Aerobat


Built a Sukhoi Su26-like airplane whose mission is to fly aerobatics slowly and in small spaces.

Constructed entirely of Model Plane Foam the airframe came out to about 13 ounces, 16 ounces all-up with the battery. wingspan is 44 inches.

Initially using a Scorpion 2212-960Kv outrunner, 2s 1300mah lipo and 10x7 APC-SF prop.

A couple of test flights showed that it is aerobatic, but not particularly slow. More testing with different batteries and props might get it to where I want it.
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Nov 19, 2019, 10:46 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Using the lightest battery that will give you a flyable CG will probably slow it down a bit more .
Nov 20, 2019, 09:29 AM
treefinder
springer's Avatar
Also using a lower pitch prop will cut top speed and make throttle less sensitive if that is what is wanted. Maybe try a 10x5 of you can find one.
Nov 20, 2019, 12:19 PM
Registered User
What about 11x4.7sf?
Nov 21, 2019, 05:14 PM
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FlyingW's Avatar
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Tried it out today with three lipo cells and a 10x4.5 prop (from my multirotor prop stash).

While the plane kept its energy better in maneuvers, it required too much airspeed for my liking to fly well. It flew more like a pattern ship than a slow flying, small-field aerobat.

So I binned it and am working version 2 which will have more characteristics like that super slow indoor model seen earlier in this forum.
Nov 21, 2019, 05:39 PM
Registered User
I wouldmake a different aerofoil, that method of making a wing makes for a 'spikey' shape so airflow is not smooth.

This could be why it didn't fly slow and gentle like you hoped.

Use 3 mmDepron and BEND the sheets to a nice aerofoil. Or for a slimmer aerofoil use 5mm Grey Depron (is likeness of rubber more than Depron White!) or HobbyKings 5mm foam (bendy unlike Depron) and bend two sheets around a 6mm wing tube.
Nov 24, 2019, 12:51 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by FlyingW

So I binned it and am working version 2 which will have more characteristics like that super slow indoor model seen earlier in this forum.
If you are attempting to make an F3P plane , there is an RC Groups forum for those . The forum has sticky's with plans and equipment recommendations . https://www.rcgroups.com/indoor-pattern-f3p-373/
Nov 25, 2019, 05:31 AM
Registered User
Try to use flaps?
Nov 28, 2019, 08:14 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
I had forgotten about a slow aerobat you can make , LeadFeather's Yak 55 . The plans are in this forum :
https://www.rcgroups.com/forums/show...eos-free-plans
For the slowest flight , make it as big as you possibly can and as light as you possibly can .

Here is one built by RCGroups member boa2110 :



32" Yak-55 (3 min 15 sec)
Nov 29, 2019, 02:12 PM
flyin' fool
goldguy's Avatar
Light weight and low wing loading is key to achieve slow flight and good aerobatics!!!!!
Nov 29, 2019, 02:24 PM
flyin' fool
goldguy's Avatar
Twisted Hobbys Indoor Flying Fun (2 min 22 sec)
Nov 29, 2019, 02:48 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by goldguy
Light weight and low wing loading is key to achieve slow flight and good aerobatics!!!!!
I think FlyingW is referring ( in post #5 ) to seeing the video of this plane , 37 grams AUW :




DONATAS DESIGN / AL "VICTORY" 1S F3P INDOOR RC 37GRAM MODEL - STEVE SCHAFER - 2016 (8 min 9 sec)
Nov 30, 2019, 11:16 AM
Registered User
SilbernerSurfer's Avatar
Quote:
Originally Posted by goldguy
Light weight and low wing loading is key to achieve slow flight and good aerobatics!!!!!
As far as I know the rule of thumbs is that everything below 10 gramms AUW per dm2 wing area will be slow.
Nov 30, 2019, 12:24 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by SilbernerSurfer
As far as I know the rule of thumbs is that everything below 10 gramms AUW per dm2 wing area will be slow.
The lighter the wing loading , the slower the flight .


Indoor free flight (0 min 34 sec)
Nov 30, 2019, 04:23 PM
Registered User
SilbernerSurfer's Avatar
I know! The 10g/dm2 is just a mark to compare. And to get a feeling for the speed.


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