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Old Jul 08, 2012, 03:49 PM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,808 Posts
Joe,
Just weighed it and with a 3000 mah 4cell Lipo and it is 4 3/4 lbs!

Been playing with different blades/ motor heights and hang angles today, started off with the blades from last week at 46" diameter (had a bump with these as I got into an uncontrollable negative G dive!). Ended up with 64" diameter blades and what a difference!
Made a video as I was trying things out, you can see the dive but my camera girl just missed the impact!

Have you had a play yet?


Regards

Rich
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Old Jul 08, 2012, 04:03 PM
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Jockadopolus's Avatar
Scotland
Joined Jan 2010
936 Posts
Rich many thanks for the info keep it coming
I hope to get the Air Space flying first then get back to the Pegasus
Been busy at the flying field teaching helicopter pilots
Joe
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Old Jul 08, 2012, 04:12 PM
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Si_B's Avatar
United Kingdom, England, East Grinstead
Joined Nov 2007
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What a fabulous looking model. I like the sound of the shrouded prop.
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Old Jul 08, 2012, 05:05 PM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,808 Posts
Its a power sucking lipo killer!


Heres a video I made from today, getting better slowly.

RC Autogyro testing, Avian 2 -180 (4 min 45 sec)



Regards

Rich
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Old Jul 08, 2012, 05:29 PM
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Great info and video you will have it doing jump take offs next
Joe
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Old Jul 08, 2012, 05:40 PM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,808 Posts
Joe,
Don't think so, the jump would be the easy bit. Its the transition that is the hardest part. Power to the rotors, positive pitch with motor off to jump, then back into to negative pitch whilst tipping the rotors back and applying motor power to get back into auto rotation all in a split second.
Not impossible but you would need quick thumbs or cheat with electronics

I'm just happy to fly around in circuits killing my Lipos and making a noise

I did have a chat with my mates and they reckon if I build the back how it was originally (streamlined) then this would possibly give me a little extra thrust?

Regards

Rich
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Old Jul 08, 2012, 09:08 PM
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britinoz's Avatar
Elizabeth South Australia 5113
Joined Nov 2005
1,685 Posts
G"Day Rich
Looks a little bit of a hand full buddy............re your prop situation........If I remember correctly Dave had a three blade in that model ?? I believe that you will get a better run using a two blade prop that has been cut back with a square tip and about 1-2 mm clearance inside the shroud .{make that gap as small as possible} If you don't use this set up ,then you will be wasting a lot of power.
Chris..........
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Old Jul 09, 2012, 07:14 AM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,808 Posts
Chris,
Yes it was a handful with the smaller blades but with the longer blades it was pretty easy to fly and stable.
I did try t get the prop as close to the housing as I could but it is not perfectly round so I had to compromise, the largest gap is about 5mm and the smallest about 2mm. I am using a 3 bladed prop so I could switch to a 2 blader maybe with more pitch. What do you think?
I could make a new housing perhaps and increase its diameter a touch?

Regards

Rich
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Old Jul 09, 2012, 08:27 PM
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britinoz's Avatar
Elizabeth South Australia 5113
Joined Nov 2005
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Rich
The gap is the problem...............with a shrouded prop/fan system,it is pretty important to have the blades as close as posssible to the shroud. A two blade prop will be a lot more efficient as the third blade is just going for a ride. Using a larger dia blade and cutting it back is the way to go and not rounding of the tip, but keeping it with a small curve on the tip to match the dia of the shroud.You may also need to use a higher KV motor to get more revs out of it.Re the pitch......trial and error....you should not need more than 6".
I have been flying a Fantrainer for about 10 years and my system is not heavy on the lipo.
Chris............
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Old Jul 10, 2012, 03:40 AM
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Scotland
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Quote:
Originally Posted by Mud Duck Bill View Post
Wow Joe :
Did you notice that that prop seems to fit in a channel inside the shroud with a black rubber gasket, That shroud must be pretty ridged as not to interfere with the prop.That is one tight fit and hard to center.
Bill
As bill observed the full size Pegasus had what looks like a rubber ring to minimize the gap
Joe
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Old Jul 10, 2012, 08:59 PM
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britinoz's Avatar
Elizabeth South Australia 5113
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That rubber ring would be very efficient if you could get it to work..............but ......lot of work..
Chris......
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Old Nov 07, 2012, 02:36 AM
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Scotland
Joined Jan 2010
936 Posts
Hope to get some work on my Pegasus this winter
Footage of the full size
Pegasus Autogyro Certification Flight (2 min 54 sec)
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