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Panther Trainer Autogyro

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Panther Autogyro

Panther Autogyro

info for builders of RCM&E's March 2013 free plan

March 2013 issue preview

March 2013 issue preview

in the shops 8th Feb!

RCM&E April 2013 issue preview!

RCM&E April 2013 issue preview!

in the shops 8th March

Second Time Around

Second Time Around

Colin Budds rediscovers his love of autogyros

David Oatham14/08/2020 17:30:22
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13 forum posts
23 photos

Hi Andy, you will enjoy building your Panther I'm sure. This thread is VERY long as you will have discovered, but from my experience it's worthwhile wading through it. There are (or at least were) a few minor errors on the plan, but that is no criticism of Richards design. Regarding the top spindle, I did as was suggested and placed a 'Wanted' ad on the BMFA Classifieds and picked up one for £10.

My Panther is still awaiting its' maiden flight which may take place this Sunday, weather permitting dont know

Enjoy the build !!

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Bob Cotsford14/08/2020 18:56:46
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8744 forum posts
487 photos

I was curious whether the height of the blades above the tilt pivot was critical as I was thinking an old pancake can motor from a dead Pheonix glider might be repurposed as a bearing unit with the windings and magnets removed.

Richard Harris14/08/2020 22:19:20
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2196 forum posts
2034 photos

Andy,

I have put an add on this forum for gearboxes in the past with fruitful results, Astro or Irvine units are the cream if you can get one. If you have no luck I can machine a spindle up for you but would have to get the materials needed first?

Bob,

Your right in your thinking, the further the blades are from the head pivot the more load is exerted on to the control mechanisms.

An old brushless motor works fine as I have tried it on smaller models, with the Panther I would say you would need one with at least a 5mm shaft if using a standard prop driver. I say that as I once had a 4mm shaft shear in flight, probably down to an poor balanced set of blades embarrassed

Rich

Bob Cotsford14/08/2020 22:41:49
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8744 forum posts
487 photos

Cheers Rich, that's another project lined up then.

Andy Joyce15/08/2020 07:24:42
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303 forum posts
64 photos
Posted by Richard Harris on 14/08/2020 22:19:20:

Andy,

I have put an add on this forum for gearboxes in the past with fruitful results, Astro or Irvine units are the cream if you can get one. If you have no luck I can machine a spindle up for you but would have to get the materials needed first?

Bob,

Your right in your thinking, the further the blades are from the head pivot the more load is exerted on to the control mechanisms.

An old brushless motor works fine as I have tried it on smaller models, with the Panther I would say you would need one with at least a 5mm shaft if using a standard prop driver. I say that as I once had a 4mm shaft shear in flight, probably down to an poor balanced set of blades embarrassed

Rich

Richard

Thanks very much for the offer. Need to look first through my old motor box to see what could salvaged to make a head. Think I have an old dc motor with a gearbox, so its just a matter of locating it.

Big T15/08/2020 13:20:11
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220 forum posts
202 photos
Posted by Bob Cotsford on 14/08/2020 18:56:46:

I was curious whether the height of the blades above the tilt pivot was critical as I was thinking an old pancake can motor from a dead Pheonix glider might be repurposed as a bearing unit with the windings and magnets removed.

I have done the same. As long as the blades clear the tail fin when the rotor is tilted back to the max for spin up it will be OK.

Andy Joyce17/08/2020 17:30:02
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303 forum posts
64 photos

Found an old gearbox in my motor spares box which has a 3.8mm shaft. Am I correct in assuming this is not suitable for a panther?

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Richard Harris17/08/2020 23:07:32
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2196 forum posts
2034 photos

Andy,

I had a similar gearbox fitted to one of my first autogyros, it flew well for a few weeks but always had a wobbly UC. This was caused because of an inbalance in the rotor disc that I was going to get round to fix.

One day the 4mm shaft fractured, as you can guess the fuselage was like a lawn dart and the blades floated to a soft touch down. The model was repaired with an Astro box fitted, the blades were balanced properly and I had many safe flights there after.

Ever since then I have been meticulous in the balancing of all my blades as I'm 99% this was the cause of the failure and any model around this size uses at least a 5-6mm spindle.

I have found the photos I took at the time, the model before it happened, the shaft failure and front end damage.

 

In a nut shell, if it were me I wouldnt use it on the Panther. Of course I could have had a substandard shaft but I will never know.

 

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Rich

Edited By Richard Harris on 17/08/2020 23:08:23

Andy Joyce18/08/2020 09:22:49
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303 forum posts
64 photos

Having read the thread I did suspect that this would be the answer Richard. Will return it to the scrap box as I can see there would be insufficient metal to drill it out to let in a 10mm flanged bearing.

Now thinking a combination of your solid ply base design with a fixed 5mm shaft extracted say from a 450 or 500 helicopter, topped off with a Coolwind Models C30 Razer, 5mm bearing assembly is the way to go.

Whilst contemplating, will dig out my old Atom which I never got flying, but think there will be damage to be repaired first before any attempt at flying can be done. Just got halfway through the Atom thread to see what I did wrong.

One thing I do like from your pictures above is the elastic band preventing the undercarriage legs from deforming too far under crash or heavy landings.

Andy Joyce04/09/2020 10:20:59
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303 forum posts
64 photos

Fiberglass sheet arrived from the far-east today but a quick measurement shows it to be 1.7mm against the 1.5mm specified. Is this going to matter for the blade plate?

Decent gearbox has also been sourced for the rotor head, so just waiting now for the laser cut parts to arrive from Sarik before I can start building.

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