Scaling an Arkansas Traveller?

[Andrew Tinsley]

Hello Everyone,
  I know it isn't stunt, but for years, I have wanted to build an Arkansas Traveller, complete with a McCoy 60 Red head, Black case ignition motor. So far I have drawn a blank on obtaining a McCoy 60, so I got to thinking of building a scaled down version or two for a Red head, Black case McCoy 29 and 49, which I do have. I can then go on searching for a 60 to complete the trio! At this stage folk are probably shaking heads and wondering if this old fellow is quite right in the head!
  Assuming that the power of the McCoy family are proportional to their displacement (big if), then how does one go about scaling down the plan? My copy is probably a copy of a copy of a copy and the rough linear scale of 8 inches on the plan is in actual fact nearer to 7.75 inches. This gives the full size 60 version a span of around 30.5 inches.
  My brain refuses to get into gear and I am wondering if the scaling factor should be linear or squared (i.e. proportional to wing area), cubed seems way out. My initial feeling is that the scaling factor should be proportional to wing area, but for the life of me, I can't work out if this is correct! Help please!

Regards,

Andrew.

[Garf]

McCoy 60's are out there. All you need are deep pockets. Sounds like that is a speed plane. Never heard of it.

[Andrew Tinsley]

Hi Garf,
 Yes the McCoy 60s are out there and I have been piped at the post a few times! My pocket probably isn't deep enough for a pristine example, looking for something that I can restore. I have plenty of time and machine tools, even do my own anodising!

Regards,

Andrew.

[rustler]

I have plenty of time and machine tools, even do my own anodising! Regards, Andrew.

Whoa!! Wahey... !! That's let the cat out of the bag Andrew. Sooo. You do anodising. I may be in touch!! 

[rustler]

On the business of scaling, an indication may be obtainable from the Pete Wright series of speed models. Drawings are published of his Gook and Bazooka models, essentially the same model to different scales, viz. for E.D. Racer and Dooling 29. He also built one for McCoy 49, and there is a photo. I always thought it would be nice to have all three, plus scale up for the one he did not build, for McCoy 60, probably BCRH. The Gook plan is published, and I also have measurements from the original Bazooka.

[Andrew Tinsley]

Hi Ian,
          Looks as though I should have kept my big mouth shut about anodising! I usually do it during summer, because the process I use is temperature dependent. I am not allowed to have witches brew in the utility room let alone the kitchen! Maybe I shall have to rig up a temperature controlled bath.........another job to join the queue! Don't forget that half the secret is in polishing the alloy before anodising and that means lots of elbow grease. My elbow grease doesn't come cheap! I have to raise the cash for a McCoy 60 somehow!!!!!!!!!!
  Thanks for the info on the Gook and Bazooka, should be interesting to see the scales chosen for the various engines. I am sure that I am missing a trick on the scaling. One should be able to use theory to work it out. I am a physicist after all and I should be able to think this one out. For some reason, I just can't get to think straight over this problem. There ought to be loads of people on the forum that scale models on a regular basis. Someone here should be able to get me out of this embarrassment!

Regards,

Andrew.