Would it be possible for someone to please explain the prop damage difference between the 12,4,and 8 o’clock position prop blades on this belly landed Lancaster?
The 8 o’clock position blades seem to be bent forwards whilst the others are bent backwards, did they hit first or last?
Thanks
http://www.dva.gov.au/aboutDVA/publications/commemorative/bombercommand/Pages/Image081.aspx
By: Arabella-Cox - 10th April 2014 at 22:47
Yup, agree. See post #4
Anon.
By: The Blue Max - 10th April 2014 at 21:48
If you look at the outer engine the blade is most definitely bent fwd, you can see that by the shape of the blade. Rear face would be flat, or at least flatter !!
By: Arabella-Cox - 10th April 2014 at 21:14
I still stick with my original theory. I suspect that the prop blade bent forward on the inner engine has, due to the impact, sheared the pitch change gear ring at its base within the hub and twisted around to face the “wrong” way. It happened quite a lot with Ham-Stan/de-H hydromatic propellers under severe impact.
Anon.
By: The Blue Max - 10th April 2014 at 20:59
props hit under power bending first blade, no power being developed after that so other blades bent backwards.
By: hampden98 - 10th April 2014 at 20:36
Interesting the story about `the night of the intruders`, With 19 Lancs and 25 Ju88’s lost it would seem to have been the night of the interceptor!
Anyone know what the Ju88’s were shot down by? Presumably mosquito’s.
By: Pim Pouw - 10th April 2014 at 19:50
Please look at the picture carefully, on both engines one blade is bent forward and the other are bend backward !
My gues is that if you look at the damage on the nose that the plane slide over the grass sideways in the direction this picture was taken
By: Arabella-Cox - 10th April 2014 at 18:49
My guess is in this instance that the pilot, when landing, realised too late the gear wasn’t down and opened up to climb away. The engines were in idle for the flare and landing and the inboards contacted first. The inboard engines were stopped by the impact but the outers, being a few feet higher due to the dihedral of the wing, didn’t hit and revved up (and the blades bent forward) before the inevitable happened.
Anon.
By: TonyT - 10th April 2014 at 18:00
As one 8th bit says, when a prop is pulling under power it forms a forward facing cone, rather like a Helicopter rotor when lifting off, when it hits it bends in the direction it’s pulling, for that to bend aft it would need to lift the plane up…..power off or low power means no cone, so fwd motion comes into play… Hope that helps a bit
By: Arabella-Cox - 10th April 2014 at 16:08
Prop blades bend forward mean that the engine was under power when the blade struck. Bent back meant the prop was turning but not under power.
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April 10, 2014 at 4:01 pm