HS748

[Le TVR]

It's time for another propliner.
Does anyone know a source for a good set of drawings for the HS748? There are a few 3 views on the web but they are woefully inadequate at 1:12 scale.

[Eric Mc]

What model are you planning on building?

Welsh Models do a vacform 1/144 748.

[Le TVR]

I was thinking of a series 2 in BahamasAir colours. I've got a reasonable 3 view blown up to A2 size ie somewhere around 1:60. The basic plans are now drawn but some details are not visible on then views. I'm not looking for absolute scale, just that there is nothing obvious missing. At 102 inch span minor details get rather big.
It doesn't seem to be a very well documented aircraft, guess I'll have to work with photos.

[Eric Mc]

Are you going to build it from scratch or try to use a kit of some sort.

As I said, Welsh Models do one in 1/144. I'm not sure if anyone does anything in the larger scales.

[Le TVR]

It will scratch built. Don't think that anyone has done a RC model of one before and certainly there is no sign of either a kit or plans anywhere.
I found some pictures of the Welshmodels one, I got the impression it looked a bit 'iffy'?

[Eric Mc]

Le TVR said:

It will scratch built. Don't think that anyone has done a RC model of one before and certainly there is no sign of either a kit or plans anywhere.
I found some pictures of the Welshmodels one, I got the impression it looked a bit 'iffy'?

In what way?

It's a vacform so will have the inherent build problems associated with that form of model but it is the onl;y kit of the aircraft out theere, as far as I know. There may be smaller scale white metal ones out there too.

[Le TVR]

Looking at several more completed models it is clear that the overall result with vac-formed kits is proportional to the talent of the builder. There are excellent ones just as there are iffy ones.
Will try posting a request on Keypublishing Forum when it's back up and running.

[Eric Mc]

Absolutely. Making a vacform look good is very difficult.

[magpie215]

Ah the budgie.....I have some fairly close up pics from my time working on them.

Want me to scan some into photobucket? any use to you?

[Le TVR]

Close up detail photos are always useful. There are a couple of photographic "walk arounds" on the web but most of them have little of interest.

Thanks.

[magpie215]

Here you go hope they are of use.

G-BEJE was a series 1 these pictures were taken around 1998 at Blackpool just before we stripped it to spares.





G-AYYG came in from mount cook new zealand it became G-OSOE.



the pics of G-ATMI were just after a runway excursion at liverpool AAIB report about it on the net if interested.



G-BIUV in the very early Emerald paint scheme at Liverpool



G-BPDA the first 748 to come on fleet with Emerald being loaded at Blackpool around 1990 re reg G-ORAL nose section in preservation(wirral area).



G-BGMN with Jersey European at Blackpool...Emerald eventually acquired MN

[Le TVR]

Thanks! They have answered most of the questions I have so far.
Should now be able to complete the plans for the wing and nacelles.

[magpie215]

I do have further pictures and a bit of knowledge so if there is something you need to know give me a shout will see if I can help.

Also I have an airline type desktop model of the 748 which I have been contemplating moving on...any interest to you/anyone you know?

[Le TVR]

The plans for the fuse, tail and nacelles are drawn now and most of the sections are done. Have started on the wing this morning. Only one question at the moment. It looks like the lower rear of the nacelles overlaps the flaps but is not attached to the flap? ie the flaps track rearwards out of this slot and no part of the nacelle moves?

Thanks for the offer of the model but if all goes to plan I shall need all the spare space in the workshop!

[Eric Mc]

Why the 748?

And what type of engines will it have?

[Le TVR]

Good question, I don't think there is any particular reason, just things like:
never seen one modelled before, I like the high aspect ratio wing, it's not a technically challenging shape....
It's a little early to nail down the power yet but I'm working along the lines of 1kW brushless electric each side on 12x8 3 blade props. That puts the target AUW around 7 kg.

[magpie215]

[quote=Le TVR]Only one question at the moment. It looks like the lower rear of the nacelles overlaps the flaps but is not attached to the flap? ie the flaps track rearwards out of this slot and no part of the nacelle moves?[quote]


correct

The aft structure of the nacelle had a jetpipe tray over the flap and did not move in any way.

[Le TVR]

Thanks for the confirmation, I'll get back to the drawing board.

[Eric Mc]

The 748 is an interesting aircraft in that it was Avro's last production aircraft. I wonder did any of the techniques used in its construction carry over from the ill-fated Tudor?

[magpie215]

Eric Mc said:

The 748 is an interesting aircraft in that it was Avro's last production aircraft. I wonder did any of the techniques used in its construction carry over from the ill-fated Tudor?

Eric not sure if true or not but an old timer on the 748 told me certain parts on the 748 were almost direct copies of part used on Lancasters iirc he mentioned trim wheels and rudder bars/pedals?