Jan 27, 2013, 03:02 AM
Registered User
I took the liberty of editing your diagram (butchering!) to better illustrate the assembly sequence. I hope this helps


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Description: Assembly sequence for SFH
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Jan 27, 2013, 07:50 AM
Derek_S's Avatar
Malcolm, sorry I have delayed to do that for you, but I neglected to mention it might be a little bit before I could get to it as I was actually working on some freelance this weekend.

BUT, I just sat down and knocked it out really fast. Let me know if you need more editing.

It should probably also be noted the image is not to scale, if you do put this in the PDF.
Last edited by Derek_S; Jan 27, 2013 at 11:26 AM.
Jan 27, 2013, 08:42 AM
Registered User
Tom Wright's Avatar
Hi Derek

If that's a quick "knock up I would like to see proper job" Brilliant and very helpful .

Jan 27, 2013, 10:43 AM
Registered User
Wow, thanks Derek. I wasn't trying to pressurise you - brilliant job.
The only difference I can see is that you have a spacer in the spruce arm.
I don't recall one on the SFH.

Tom, is a spacer used?

If its not required i can take it

Jan 27, 2013, 11:02 AM
Registered User
Tom Wright's Avatar
Derek and Malcolm.

A spacer is not required ,and not used on my original model .It would only increase the bending moment on the arm .Great drawing though.The 3mm bottom lock nut is all that's needed.

Jan 27, 2013, 11:27 AM
Derek_S's Avatar
Jan 27, 2013, 12:25 PM
Mike's Ma Maaaaaaaaan

Hard part done :-))


of course you can use the illustration, just sorry that I donít have time to do a more professional one.
Got the blades done today, went well except that one of the lengths of trailing edge stock had a different weight distribution which meant that although all 3 blades were within 0,15 of a Gram that the C of G of one blade was a whole centimetre out. I used my old method of drilling holes in the blades at the appropriate ends at the maximum chord position and then filled them with hot glue (epoxy works well too, and you can mix some lead shavings in) to balance and they are now smack on.
I will add a picture to show what I mean.

Tom, did I read somewhere that you use 1800 mAh packs?? I have 3 of them (140 Grams each) and if they will fit and balance I would use them, what do you think?


Paul Bray
Jan 27, 2013, 02:28 PM
Registered User
Tom Wright's Avatar
Hi Paul.

Thanks for posting the photos . those blades should be fine with any size lipo up to 2.2A ,as long as the lipo's are mounted under the floor as suggested in the pdf.

Jan 28, 2013, 02:19 PM
Registered User
Tom Wright's Avatar

Here is the revised pdf for the Crane Fly SFH , I hope this helpful to existing builders and to those wanting to have a go .

Many thanks to Malcolm , Paul, Derek and Allan for their contributions .

Feb 03, 2013, 12:05 AM
AMA 562227
Three-Wire's Avatar
Anyone on the fence about autogyros should just jump in and build one... I did and it's been great fun! My Crane Fly is an early version but flies superbly.

One word of caution, be sure your ESC's BEC is up for the job of handling the servos! Brownouts are unpleasant, even in autogyros.

CraneFly Flight #2 (2 min 0 sec)
Feb 03, 2013, 07:05 AM
Derek_S's Avatar
My bearings just came in so I should be able to finish mine sometime this week.
Feb 03, 2013, 11:18 AM
Registered User
Tom Wright's Avatar
Three Wire.

Congratulations on your success with a MK 1 Crane Fly , and for taking the time to post the video . I must say the MK 2 and SFH versions are easier , so you have done well . .

Feb 04, 2013, 02:23 PM
Mike's Ma Maaaaaaaaan
I was knocked out with a Bug last week. Had a 39,5 temperature which made me a bit woosy in the head, might explain why when I got my order of bits from Giant Shark today that I found out that I had ordered 2 Blue Wonder engine mounts but only 1 wheel!!!! Can I re-design the model to be a twin rotor uni-cycle?????


Oh well, off to the LHS to find 2 big light wheels :-))
Last edited by PaulB; Feb 04, 2013 at 02:24 PM. Reason: Spelling.
Feb 04, 2013, 03:28 PM
Registered User
Tom Wright's Avatar
Don't worry Paul I get things wrong even when I feel well .

Feb 06, 2013, 02:31 AM
Registered User


I want to clarify about blades :
C30 cervia blades are given for 690mm rotor
In the PDF home made blades are 400mm long giving some 850mm rotor
So What is wrong ?
Are Cervia blades lengh OK ?

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