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Vega ECM
Rank 5 Registered User
Last Activity: 16th September 2018, 17:37
Joined: 27th October 2005
Location: South Glos
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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Its good question. Please check out the picture below;-
    (Image credit to Stanford A Moss)

    The Bristol Hercules came as a Power Egg for quick installation & removal but the wing structure has a lot of fixed structure in order to accommodate this. Theres no evidence of these...
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    Last edited by Vega ECM; 14th September 2018, 19:38.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Graham
    Cruise is not undertaken in the take off configuration i.e flaps down......You clean up, ie raise flaps to reduce drag in the cruise condition.Thats why you have a high lift system;- for take off;- it allows you get airborne with one low drag point at low speed and then cruise at a second...
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    Last edited by Vega ECM; 16th September 2018, 16:41.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Graham
    Remember this take off is being done at not far off Max Landing Weight (MLW). For an aircraft with a stalling speed of about 80-90 knots its Velocity min unstick (Vmu) is normally about 10-15 knots below Cd min (min drag). The flap limiting speed (max thrust = max drag) is normally twice...
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    Last edited by Vega ECM; 15th September 2018, 08:45.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    HP111, ah, although balancing the cg is essential for flight, its actually the moment you need to restore, and the outboard engine really isnt that far forward of the cg. As a simple guide two tons removed from about a meter forward of the cg can be balanced by about 120kg on the tail.

    ...
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    Last edited by Vega ECM; 13th September 2018, 06:53.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Im not so sure;- many twins of the period had lethal engine out handling zones within their flight envelope;- Mosquitoe, Meteor, Canberra* to mention a few;- the Miles Aerovan was certified despite being unable to maintain level flight on one engine in any part of its flight envelop ...... the good...
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    Last edited by Vega ECM; 12th September 2018, 19:25.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Pictures from Flypast attached.

    So in summary;- four people have reported theyve seen this twin, two took photos. Hence in my mind its not a fake or retouched photography. It was most likely at RAF Riccall in late 1944 early 45. How did it get there? There was little in the way of hangers...
    So in summary;- four people have reported see this, two took photos. Hence in my mind it’s not a fake or retouched photography. It was most likely at RAF Riccall in late 1944 early 45. How did it get there? There was little in the way of hangers at Riccall to undertake such work but this doesn’t offer more than an opinion. The aircraft was probably on charge with 1332 squadron Heavy Transport and Conversion and is reported to have been marked TT-X;- will 1332 operational records offer an aircraft
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    Last edited by Vega ECM; 12th September 2018, 10:59.

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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Many thanks for the replies.

    I dont think the Flypast photos are a hoax or show an aircraft mid dismantling. The wing leading edges look too good with absolutely no sign of controls/pipes etc sticking through them. I could believe that if this one is being confused with the Radlet example...
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  • Vega ECM
    replied to HP Halifax Twin Engine Modification
    Found it;- Flypast May 94 Article Title Something Missing

    Two photos which were found in a former Canadian serviceman album (amongst girls and pubs)showing a Hercules engined Halifax with inner engines only, the outboard having been removed and the holes made good with wing skins....
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  • Vega ECM
    started a topic HP Halifax Twin Engine Modification

    HP Halifax Twin Engine Modification

    Hi
    A good few years ago either Flypast or Aeroplane Monthly published a few pictures of a twin engined Halifax. The was not the early HP56 proposal (I believe never built) but a late production model with the two outers, complete with necelles removed and the hole skin replaced to a flight worthy...
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  • Thanks again Tempest/Eric/Ed
    I know precisely what’s I’ve got here (Grade B Beech)and I can now order replacement ply.

    Silver biplanes is great site and the responses from you guys is this forum at it best.
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  • Many thanks Tempest and Eric. The information is really appreciated
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  • Help wanted - Aircraft Plywood Specification 6V3B

    Does anyone know what type of wood is used in plywood specification 6V3B?

    I believe this a British Spec from 1930 - 40s possibly earlier.

    Any help or leads greatly appreciated.
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