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aircraftclocks

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May 8, 2015 at 2:27 pm in reply to: Help identifying Smiths Fuel Gauge #915929

aircraftclocks
Participant

All I can tell you about this instrument is that its Sect. Ref. number is 6A/6432.

March 3, 2015 at 2:24 pm in reply to: Can anyone i/d this old RPM gauge? #887345

aircraftclocks
Participant

This is a Smiths model AV.503 engine speed indicator.
The standard calibration was 60 to 2600 RPM. When you placed an order you needed to state the calibration required, the particulars of the engine and if dial markings were to be luminous or non-luminous.
The Mk V is the standard version of this model.
All the other models of indicators have a 14 or 14A printed on the dial face. So it looks like this one is a civil one.

December 30, 2014 at 11:40 pm in reply to: Help Wanted With Mk5a Clinometer #861439

aircraftclocks
Participant

Now, can anyone explain the difference between the Mk. V and the Mk. VA?

I don’t have the answer but…..

From a Department of Aircraft Production publication, Aeroplane instruments (2nd edition) dated February, 1918

“Mark V and Va only differ from Mark IV in having an electric lamp at one end so that the bubble can be seen at night.”

Having a look at the specification documents I have, these are amongst them

17th July, 1916.
ROYAL AIRCRAFT FACTORY SPECIFICATION No. 101A.
(Cancelling R.A.F. Specification No. 101).
CLINOMETERS FOR USE ON AEROPLANES.

30th May, 1917.
ROYAL AIRCRAFT FACTORY SPECIFICATION No. 155A.
(Cancelling R.A.F. Specification No. 155).
MARK V.A. CLINOMETER WITH ELECTRIC ILLUMINATION FOR USE ON AEROPLANES.

The difference could be explained in the earlier cancelled specification, RAF 155.

For the record, the drawing numbers are given as 2346/W, 2347/W and 2348/W.

December 30, 2014 at 11:39 am in reply to: Help Wanted With Mk5a Clinometer #862240

aircraftclocks
Participant

I have found the clinometer listed as being fitted to both the Bulldog Mk2 and the Hyderabad, according to AP1393 and AP1318 respectively.
I suspect most aircraft in the 20’s would be candidates for this instrument to be fitted to.

December 8, 2014 at 10:14 am in reply to: Dutch National Military Museum To Open This Week #879159

aircraftclocks
Participant

Is there going to be a library or archive at the museum for research purposes?

November 26, 2014 at 12:29 pm in reply to: Abbreviation – U.E.T. ? #891087

aircraftclocks
Participant

Thanks everyone.

Unit Equipment Table sounds good to me.

October 26, 2014 at 11:14 pm in reply to: 26ee – any idea? #919177

aircraftclocks
Participant

26EE had also been assigned in the 1920’s to the Avro Andover.

September 11, 2014 at 1:55 pm in reply to: The hunt resumed. #882723

aircraftclocks
Participant

The above information is also given in the 1934-5 air annual as well.
While the dimensions are slightly different as shown in the diagram above compared to your tank, the volume of the “large” tank is given as 1174 cu. in.. I would say it is most likely the same item. For the record the weight of the tank is stated as being 12.37lb or 5.62Kg.

September 7, 2014 at 7:03 am in reply to: Any idea what this 'elapsed time' clock used on? #886508

aircraftclocks
Participant

A.P.112G-0805-1

A.P.112G-0805-1 gives the following description for, CLOCK, ELAPSED-TIME, TYPE N.L. 1395

Introduction
1. The clock, Type N.L. 1395 (Ref. No. 6A/5184), is an elapsed-time aircraft instrument and provides an accurate time datum when flying on a Q.D.R., thus enabling the various stages of a let-down to be accurately timed, or for a given rate of turn to be maintained for a predetermined time.

2. This elapsed-time clock is complementary to the time-of-flight clock, Type N.L.6520-VC (Ref. No. 6A/5183). The two clocks constitute a set.

I have this set as being fitted to the VC10.

I have always wondered what the VC in the part number stood for, perhaps I have just figured it out?

August 13, 2014 at 2:44 pm in reply to: AP1348 applies to which aircraft? #909027

aircraftclocks
Participant

Anne
Having looked into it a bit more, you would be correct that, as each new aircraft type came in to service, a new AP number was issued in the 20’s. I have noticed this with administrative type AP’s

An Air Ministry order, A.819/30, issued in 1930 laid out the three-volume scheme for technical publications relating to aeroplanes and aero-engines.

Air Ministry order, A.201/34, issued in 1934, set a standard system of numbering each of the constituent parts of the three volumes issued under this earlier order. The AP number assigned to a new aeroplane or aero-engine was promulgated by an Air Ministry Order introducing the type, the suffixes which were subsequently added to identify publications dealing with later marks of the type were also published in the Air Ministry Orders.

A.M.O. A.113/35 introduced to the Service the three volume scheme for technical air publications.

August 12, 2014 at 1:40 pm in reply to: Bristol Bulldog Aileron #910233

aircraftclocks
Participant

There are a few documents about spinning tests. In light of the above, this all makes sense.

August 12, 2014 at 1:34 pm in reply to: Bristol Bulldog Aileron #910234

aircraftclocks
Participant

Aircraftclocks, thank you. Are we talking accessible vodka drinking Cracow Museum here or inaccessible tea drinking UK museum ?

It’s the one in the UK near the famous gardens. I have always found the underground the best way to access it followed by a short walk. As to tea drinking, most likely behind closed doors as you are searched for such things on entry.

August 12, 2014 at 12:09 pm in reply to: AP1348 applies to which aircraft? #910270

aircraftclocks
Participant

Ross
Thank you for your quick reply, this is the reference and am referring to.

I however think it is incorrect, as I believe that Bristol Bulldog aircraft are covered by the AP1393 series of publications.

I am just trying to find information to independently determine the case either way.

August 12, 2014 at 11:59 am in reply to: Bristol Bulldog Aileron #910273

aircraftclocks
Participant

Ed-1
Full scale tests of Hartshorn ailerons on a Bulldog aircraft has a former reference of B.A.1268, dated 1936 so may be a different document to R&M 1734. Only one way to find out.

Ed-2 The comments about the various IPB’s were for your benefit.

The documents shown as being held are as follows:

AP1393A Vol. III Part I, 1931
AP1393B Vol. III Part I, 2nd edition, 1934

So looks like parts manuals for Mk I & II aircraft.

The AP associated with the Appendix A, seems wrong to me, so I have started another thread on that subject to see if any information comes to hand in order to figure it out.

August 12, 2014 at 12:51 am in reply to: Bristol Bulldog Aileron #910432

aircraftclocks
Participant

Ed
Having had a look on the public records web site there are several IPB’s available, of different editions etc. There are at least 2, Vol 3’s and an appendix A.

There is also a report on full scale tests of Hartshorn ailerons on a Bulldog aircraft.
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