Cierva C.30 Autogiro

mcbirdman

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Thank you, I read most of both. Of particular interest to me is the compression tailwheel. I have the spring steel type tailwheels and am interested in seeing how I can still use cable control and vertical movement of wheel.

Right now I am assuming the rudder horn just goes up and down with the wheel and the cable just arcs up or down between rudder horn and the cable guide exiting fuselage.

I am interested in landing near vertical so I am interested in changing out the spring I now have. I have already made the steps towards a beefed up main gear and I have up to apx 8" of travel with the air shocks.

Thanks again, jtm
 

kolibri282

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James,

letting your cable just arc up and down might be a very good solution. If your distance to the tail wheel is like 8' and your tail wheel travels 4'' the stress you put on the cables is approximately 160N/mm² (23000psi) , which is very low even for a wire rope used for a bicycle break. Now this value is the upper bound that will be only reached if the wire were attached to absolutely rigid supports at both ends, which is definitely not the case. You will get the true stress value if you take into account the stiffnesses of all the parts that are loaded by the wire and that value will be much lower.


Cheers,

Juergen

PS: your avatar shows a very attractive tractor gyro, perhaps you might want to have a look at this nice little bird that comes with love from Russia http://www.rotaryforum.com/forum/showthread.php?t=25862
 
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kolibri282

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This one is not a Cierva but positively an old/odd drawing, so here from Russia with love:
http://hobbyport.ru/avia/a_7_3a.htm
(scroll down to about the lower quarter of the page)

Enjoy,

Juergen

(Arnie, by the end of this thread you'll receive the "Odd Old Certificate"....;-)
 
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kolibri282

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C. Beaty

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Here’s a bit about 2-blade C30s and successor, C40 from Cierva Autogiros by Brooks.
 

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kolibri282

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Pictures of Albert and Gladys Batchelor, who flew one of the, probably, very small number of privately owned C-30s.
https://yooniqimages.com/images/detail/216320368/Creative/albert-and-gladys-batchelor


Some more nice pictures of Rolf von Bahr's C-30
http://www.nordicrotors.com/reg/SE-AEA/4567#0
http://www.nordicrotors.com/reg/SE-AEA/4567#2
http://www.nordicrotors.com/reg/SE-AEA/4566
http://www.nordicrotors.com/reg/SE-AEA/4567


This is the colour footage of Rolf von Bahr flying an aerial taxi service in a Swedish ski resort from this thread:
http://www.rotaryforum.com/forum/showthread.php?p=622660
I had posted it last Christmas and just include it so that the C-30 links are a little less scattered.
http://footage.framepool.com/en/shot...erry-fairbanks
 
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kolibri282

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kolibri282

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Some high resolution pictures of a C-30 in the Mass museum
https://collection.maas.museum/object/211799
The description says the aircraft was built in 1934 and has been owned by Andrew Thyne Reid. The quality of the pictures is outstanding and they would make a nice wall paper for C-30 nuts...;-)

PS: somehow I had managed to mess up the link, thanks for the notification!
 
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kolibri282

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Picture of Rolf von Bahr flying his C-30:
https://1.bp.blogspot.com/-R0oBFWCu2x0/XTAwjQ31QGI/AAAAAAACsrs/dZUNN3bRi8cJILq780KQh9e4xVSfhbOHwCLcBGAs/s1600/49-09-27_von_Bahr_svavar_over_marken_w1500.jpg

3 view of the C-30. It is interesting to note that the fuselage has the same width until right after the place for the pilot and then takes a pretty sharp turn. This featuer is consistenly seen in drawings of the C-30, so I think it is correct.
http://www.samolotypolskie.pl/uploads/Products/product_683/Cierva_C-30A_plany.jpg
 

XXavier

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In this three-view from Brie's 'The autogyro and how to fly it' the turn is only slightly less sharp...

fc1* 1.jpeg
 

kolibri282

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You are right, Xavier, the radius at the transition to the tapering part of the fuselage is probably too small in the Polish drawing. What I actually wanted to point out is, that the tapering part of the C-30 fuselage is very short and therefore the angle at which it tapers towards the tail feathers is quite steep. This becomes obvious if you compare the C-30 to the LeO 301 that was developed from the C-30 by the French. The LeO's fuselage starts to taper almost from the rotor head position. Either the pilot cockpit of the LeO is narrower or the fuselage is a bit wider than that of the C-30 towards the front.

leo_sncase_c_301_autogires-70469.jpg

from here:

https://www.the-blueprints.com/blueprints/helicopters/helicopters-h-m/70469/view/leo-sncase_c-301_autogires/
 

XXavier

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