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Park size Avro Vulcan pusher prop

Old 05-16-2019, 08:03 AM
  #51  
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Originally Posted by Don Sims View Post
Curious to see how this one flies Nigel.
That makes two of us !!
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Old 06-08-2019, 02:11 PM
  #52  
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I could kick myself for not putting reflex before launch !

Anyway - walking across field to collect her - stepped into hole and twisted my ankle - its really swollen up now and boy does it hurt.

But main point is she flew very well ... just a pity that crash was down to my own stupid eagerness to get her back in the air without fixing that nose better.

But she WILL fly again ...
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Old 06-09-2019, 11:48 AM
  #53  
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I think it was obvious from the first launch and nose in - that single thickness 6mm is not enough for the nose length to resist breaking.

Repair has now been effected ... pieces tacked back in place with UHU Por, and nose 'reconnected'.

To strengthen and try to avoid such weakness - I then took 6mm and glued second thickness to the horizontal fuselage strips either side from nose back to that first CF rod. While the PU glue was setting - I had wood battens clamped to hold all straight and the doubling depron in place. The PU when it sets is stiff but light ... adding to the strength.



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Old 06-09-2019, 12:29 PM
  #54  
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Ready for battle again ...

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Old 06-16-2019, 09:06 AM
  #55  
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This is just unbelievable ... climbs away nicely ... flies nicely ... turn to come round to complete circuit ... she just rolls and dives ... no reason for it at all ...
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Old 06-16-2019, 03:56 PM
  #56  
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That was a strange crash. Receiver issues?
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Old 06-16-2019, 06:42 PM
  #57  
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No idea .... haven't checked the gear yet ...
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Old 06-18-2019, 09:36 AM
  #58  
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Version 3 in progress .... same size profile 6mm but will have :

Double vertical and horizontal fuselage thickness ... basically 2 x 6mm for each.
Prop will go back to rear of model to avoid that weak section in wing
Wing will have a KF style profile to it emanating out from that second thickness fuselage to help increase wing stiffness.

OK ... reasons :

1. On examining the 'wreckage' I find that the wing although stiff when constructed - now flexes significantly. I believe that after the first crash - it may have weakened the CF spar to wing foam and second flight stressed it further. Using same Cf again with more care in gluing + adding a KF profile can hopefully solve that.
2. Each crash has highlighted the weakness of that fuselage front section to wing joining area - doubling both parts of fuselage and adding the KF should increase that areas durability.
3. Placing motor / prop at rear will avoid cutting out structure that causes weakness around the slot. The doubled fuselage will then be a continuous unbroken section length of model.

'Fingers crossed' this one survives more than 2 flights !!
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Old 06-18-2019, 09:37 AM
  #59  
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Now cutting second sections for doubling ... decided that a full double thick wing may be better... this allows me to case the CF between, while having the two sheets glued stiffens a lot as well.
12mm wing depth .. I can bury the servos more.
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Old 06-18-2019, 04:24 PM
  #60  
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Serious CF spar work embedded before laminating the two wing sheets :



Doubled wing ... doubled fuselage ...



Boy is this baby STIFF !!
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Old 06-21-2019, 05:57 PM
  #61  
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Update ... ready to go ...



Specs :

Span 850mm
LOA incl prop 730mm
Motor 2826 2200KV TGY
ESC 30A Hobby King Blue
LiPo 3S 1300 - 2200
Prop 6x4 Hobby King
Radio (FrSky) 9XR
Elevon reflex is set at 6mm for initial ... will adjust
CoG at 170 - 200mm from L/E to Fuselage joint (170 is maiden setting to be adjusted)

Weight without battery 413gr
3S 1500 Turnigy 113gr
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Old 06-22-2019, 12:18 PM
  #62  
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Hope this version is a winner for you!
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Old 06-22-2019, 12:45 PM
  #63  
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They all flew ! Problem was me ...

Version 1 : Optimistic use of undercarriage ... giving trouble to RoG due to prop strikes .. in air - too draggy.

Version 2 : Forgot reflex and she nosed in on launch - split nose and I stupidly tried flying without at least a field repair. Later hidden damage came to light as CF spars had loosened allowing wing to flex.

So now Version 3 has all I learnt from first two .. fingers crossed all should be OK ...
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