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Mini Indoor Autogyro


Stephen Jones
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Hi, I am in the process of making my own Mini Indoor Autogyro but 1st I need to experiment making a head.

large.178128541_HeadOne.jpg.ad9bf639e814d3e36e2706ae0af0f7aa.jpg

 

This one is using a silicon tube to allow movement of the head Up-Down Left-Right the bearings in the tiny bell motor work really well.

Of coarse weight has to be kept down to a minimum. 

 

large.1073482891_HeadTwo.jpg.12021884a3467a784ebb7a78b2d2e3d3.jpglarge.1632038557_HeadTwoa.jpg.3f0fac36dc17caecaf809c5ce4aff71e.jpg

 

I may go with this one .

Steve.

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Happy New year Steve and good work.

 

Somewhere there is a thread on one of several small models I built a few years back, I did exactly the same thing in using silicon tubing for the pivot. I also found that using heat shrink tubing for the control 'links' worked well, I added drops of CA to the ends of the carbon rod before shrinking.

I did several experiments with blades types and ended up with a balsa LE and depron TE profiled with my sharp lower LE edge type aerofoil.

The best material used for the flapping 3 bladed head was PPP cut out of a Jacobs Cream cracker lid, 2 blades I used 0.4mm FG sheet.

Even with a modest size autogyro you should easily keep it within the walls of an indoor Gym, my reduced size Fire Fly goes well indoors. 

I had no luck with the mini Nellie, it was a little too fast for indoors, either that or the walls moved!

If you need any more info regarding my small stuff just ask, though if you are like me the enjoyment comes from going it alone.

 

 

 

 

 

mini firefly 2.jpg

mini firefly 1.jpg

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Wow, Richard where has the time gone 2013 I had completely forgotten the mini Firefly.

Thanks for the info mine maybe more of a challenge as yous looks huge in comparison to mine.

Mine has a rotor diameter of 460mm for a twin blade head  compared to yours which I think is 600mm 3 blade head.

And mine will operate on a 1 cell Lipo. So a really big challenge but if it works being smaller and lighter should work well indoors.

 

I am setting my goal Auw to just over 50g at the moment I am up to 68g so I may have to re-build several times changing head design and construction to get my weight down.

 

Fingers crossed Steve.

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My blades weigh 15g I feel these are a wee bit heavy so this could be due to the brass tube, brass collet, plastic flexi plate.

So will have a re think on that.

 

In the mean time this is the Mast.

large_Mast.jpg.a096cb6ee0c5a0269dad50bf1de5f505.jpg

 

The motor mounted and wheels.

large.755694963_Motormount.jpg.1fb426ae5914d6221b07cb9b9f8ce52e.jpg

 

And a new head which is lighter may have to lose that brass collet though.

large.909738175_Newhead.jpg.118eb6f31537d49e73724b7090792c46.jpg

 

 

Steve.

 

Edited by Stephen Jones
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Hi,

It is a bit too cold to work in the loft so I thought I would work on my drawing.

large.1307831144_NewGyro.jpg.4cd53d595e81f7c678b02be4d57605d0.jpg

 

I have done some more testing on the rotor head and decided to scrap this one as just too heavy.

large.1073482891_HeadTwo.jpg.12021884a3467a784ebb7a78b2d2e3d3.jpg

I have come up with a better solution which is lighter and will allow me to better balance the blades and alter the pitch.

After testing this unit with my blades I am happy it is lighter and better for me.

Also I think I can make lighter blades so more testing in that area too.

 

 

Steve

Edited by Stephen Jones
typo
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Now it time to make a hole through the body for the mast.

 

large.1223336607_foampt8.jpg.a59194ff53366dfa3fcdf52fc7323f99.jpg 

 

I made a guide from scrap balsa.

 

large.1763970963_foampt9.jpg.17d49f4c2e6ca5bc7cccd05ec5037078.jpg

 

This was lined up with the position on my plan.

 

 

large.581327611_foampt10.jpg.3c8e293f9b1307ff80d05a8739962106.jpg

 

This allows me to use a brass tube which will now be guided through the foam.

 

large.627249178_foampt11.jpg.0071506727c4aba6ec57ad07edac97f2.jpg

 

As you can see by the picture above.

 

large.818361376_foampt12.jpg.687fa367c7c617f403e28214f4975c55.jpg

 

Now the mast will fit into the body.

 

Steve,

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Hello again some more work done on this one today.

 

large.452757535_Foampt20.jpg.c49d99b0fdf53544b7bafca88a9e3c2c.jpg

 

Here you can see the tail plane has been added along with the control linkage. Tested and working.

 

large.71639502_Foampt21.jpg.301c662326d4da10a8749621d5fd10ba.jpg

 

The model is now fully constructed.

 

large.956378693_Foampt22.jpg.a18900bc0e7c06d6aa4470798b527027.jpg

 

I now need to permanently fix the servos in place, now I know where they need to be.

Next I need to set-up the angle of the head and blade pitch That should be fun.

 

Steve.

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2 hours ago, Richard Harris said:

Great work Steve, looking forward to some flight footage.

 

Rich

 

Thanks Rich, ??

 

Forgot to mention the weight is 56g ?

 

Servos fitted and tested.

 

 

 

 

Just a preview of the controls need to set-up the correct angles.

Happy with the weight and power so far.

Servos do not seem to have a lot of movement though. 

 

Steve

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11 hours ago, Richard Harris said:

Steve,

 

You only need half the amount of throw using 2 blades compared  to 3 and and a few degrees more rearward tilt.

 

Rich

 

Thanks Richard. Un fortunately I could not get the model to track straight on the gym floor the blades did seem to get up to speed at a walking pace but until I can try a few test hops no point in chucking it to hit a hard floor.

 

So I now need to fit new wire for the landing gear and find some small foam / rubber wheels to grip to the shinny gym floor.

 

Steve. :classic_sad:

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