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RCM&E Springfield Bulldog

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Andrew Jarvis 110/02/2015 13:01:45
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155 forum posts
84 photos

Anyone know if there is going to be a CNC part set for this model, I would like to make one but one or two of the formers look a nightmare to cut out.

Erfolg10/02/2015 13:48:33
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11395 forum posts
1208 photos

Snap!!!!

I have looked at the model, and I am pretty attracted to it, other than i am not sure that i am capable of building one.

It does seem that this is one design that would benefit from a comprehensive set of bits, from formers for the body and wing, metal work for the UC and of course a cowl, dummy engine and canopy. It sounds a pretty expensive model on this basis.

Yet, would I like to build one, yes i would!

Bob Cotsford10/02/2015 14:59:11
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8029 forum posts
444 photos

a CNC/laser cut pack would certainly make life a lot easier, and the cut parts would make a pretty comprehensive kit! It's a very tempting model but not one I'd be keen to cut by hand these days.

Dave Hopkin10/02/2015 15:04:45
3672 forum posts
294 photos

You could get in touch with Falcon Aviation in Burnley - they will CNC parts from a plan

Erfolg10/02/2015 16:02:46
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11395 forum posts
1208 photos

I hear what you are saying Dave. I am certain you are correct that the formers could all be cut as a one off. For me there is a problem, in that the service would almost certainly going to be far to expensive.

I can also imagine if they or Lasercraft were to offer packages to help spread the cost, that RCM&E could get upset. Perhaps on the basis of copyright, although I would think they  only have copyright on the drawings.

I am afraid i will be waiting until the RCM&E issue a package and i will see if I can afford one.smiley

Edited By Erfolg on 10/02/2015 16:04:01

Keith Evans 310/02/2015 16:10:20
371 forum posts
81 photos

Doesn't former no, 8 give us a clue that there will be a CNC pack. It says "cut lines for non CNC parts" .

David Ashby - Moderator10/02/2015 17:00:25
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Moderator
10918 forum posts
1674 photos
608 articles

A set of parts is in preparation.


Paul Marsh10/02/2015 17:59:45
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3725 forum posts
1055 photos

Am interested in building one, and therefore would prefer the CNC parts, due to the fuz being quite intricate and needing to be precise, as the ribs.

I would put an IC engine in it, though - reckoning a .70 four stroke.

GONZO10/02/2015 18:04:19
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1287 forum posts
14 photos

Good to hear! I've had a soft spot for this plane since I first saw it on the cover and inside the 'Eagle Book of Model Aircraft' in the summer of 1959 when I was 11y old.

Keith Evans 310/02/2015 19:03:19
371 forum posts
81 photos

I made both the "the Hall Racer "and a fully built up version of "The Gee Bee " also featured in this publication full of lovely Ray Malmstrom Designs .

They were both control liners .One has a PAW 1.5 c.c. and the other a D.C.Sabre .

They were both a great build and currently adorn my "Playroom" wall as my wife ,Sarah ,calls it .! ! !

I'm very much tempted to have a go again and yes I'd make it an I.C. version too .

Erfolg10/02/2015 19:17:02
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11395 forum posts
1208 photos

I have provided a link to a brief overview of Robert L Hall. I think you may find it interesting. There are fuller accounts around the net.

Edited By Erfolg on 10/02/2015 19:36:07

Erfolg10/02/2015 19:51:02
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11395 forum posts
1208 photos

Keith

I have the plans by Henry Haffke for the R1/2.

I have never built it as the span is only something like 1.4m with an enormous body.

The Bull dog looks a bit more viable for an average modeller and pilot. Although the build seems trickier.

Edited By Erfolg on 10/02/2015 19:56:40

john stones 110/02/2015 20:15:19
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10703 forum posts
1480 photos

As Dick Emery might say....That looks awful, but I like it yes

John

Steve Adams10/02/2015 21:14:23
186 forum posts

Great video Erfolg,

Certainly seems a docile flyer in comparison to the Westland Lysander yet the look and proportions seem similar!

Obviously the Springfield Bulldog was designed before the Lysander, maybe Westland used the bulldog as the design basis?

Steve

Pete B - Moderator10/02/2015 22:15:28
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Moderator
7586 forum posts
732 photos

Using another well-known saying, 'every little helps', judging by those miniscule flaps......smile o

Pete

Erfolg10/02/2015 22:57:25
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11395 forum posts
1208 photos

The Lysander was another design by Petter, on that basis a pretty sound design. Although for a very different purpose than the Bulldog. The apparent small area of the wings, was to provide a decent cruise speed, whilst the wing incorporated a whole series of devices for the slow end of the speed range.

I imagine it is this aspect that causes potential problems for scale models. Generally there are no flaps and slats etc. I do remember the complete-a-pac version, where the situation was made much worse by the weight of the build, all the blocks of foam, with veneer, stuck onto some sort of box,or that is what it looked like. However it was done, the model was heavy.

Looking at the Bulldog plan, a lot of effort seems to have gone into loosing weight, from where ever it is possible, particularly at the back end.

Another major plus for this design, is that the use of an electric motor, does not need the same strength of build as with IC. Although i have seen very lightly built IC models, the whole airframe can be seen to visibly shake and squirm, with each firing sequence of the engine. I do wonder what the airframe life will be.

Kevinlad13/02/2015 13:45:34
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41 forum posts
40 photos

I very much like the look of the "Bulldog" free plan, but would like to power it with a glow engine.

Can anyone suggest a suitable size of engine, 2 or 4 stroke? I'm thinking of an OS48 or 52 4-stroke, or maybe an OS55X 2-stroke. Any suggestions??

Edited By Pete B - Moderator on 13/02/2015 15:58:45

Masher14/02/2015 08:57:36
1103 forum posts
79 photos

The article suggests a built in flight pack (unless I've got it mixed up). Assuming we ignore the potential disadvantages of building in LiPo's, this means only one flight before waiting to re-charge a fairly hefty battery - I must have got this wrong???

Secondly the author says he hasn't had the nerve to do any aero's yet. Perhaps this will come in part 2 but surely this would imply the design is a bit too untested to publish?

Hope I'm missing something as I am interested in building this, probably with IC power.

Mowerman14/02/2015 13:30:57
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1542 forum posts
105 photos

I was rather surprised to read that access to the battery involves removing the motor/cowl assembly but he normally charges the lipo pack in situ.

I love the look of the model but , quite a complicated build and not happy about charging that way.

Erfolg14/02/2015 18:22:22
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11395 forum posts
1208 photos

We only have to wait a month, to discover the detail.

i suspect that due to the short nose, that the lipo or lipos are in the cowl.

The very light back end, does seem to hint at the issue of attaining the CG.

I am interested in both the model and the details. I am at present building 2*,Fw 190 (1 off A & 1 off D), where taking the wing of to arm is to painful to contemplate. In my case I have been considering using the a plug in carburetor intake as the male arming plug. I also have a Gilmore special (Black Horse), where I was thinking along the same lines. So how it is delt with with the Bulldog is more than a passing interest.

I do agree that it is quite a challenging build, or should that be unusual, in that a jigging strip is used as part of the process, a little bit retro FF.

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