Great Lakes Biplane (oz12112)
About this Plan
Great Lakes Biplane. Profile scale model, for either FF or CL.
Dual-purpose design: for C/L with .049 engine, or for FF with a Cox TD .020 engine.
Direct submission to Outerzone.
Update 21/04/2020: Added article, thanks to Pit.
Quote: "Fly your own 18 inch Great Lakes midget biplane. Free Flight or Controline An all-sheet balsa simpleton for .5 - .8 cc or Cox Tee-Dee's.
Yeeoow! That was our immediate reaction to the first free flight we made with the Cox Tee-Dee .020 bipe, plans for which are on the following pages. It's a pip of a model, and we've no doubt at all that it'll go equally well on an .010 too. Be sure of that side thrust (same for control line) and to fit the prop on back to front if you don't want a searing race track performance on YOUR first flight too. We grossly underestimated the power of the new Tee-Dee!
The control line version has had checks with the AM .049 and the AS 55 diesel, either of which give loops, wingovers and inverted flight on lines as short as 15 ft long. Wings are set at zero incidence and the balance is forward for C/L use, otherwise there's remarkably little difference between the two, except of course for the tailplanes.
Cut out all 1/8 balsa parts. Fit engine bearers in 1/4 in fuselage on C/L model, drill holes for engine bolts and woodscrews. For Tee-Dee F/F version, mount the scrap 1/4 in fairing and 1/8 ply bulkhead. Coat all surfaces with two applications of sanding sealer and when hard, commence assembly.
For C/L model join top wing halves flat, key interplane struts (with 18 swg strengtheners) into wings, using the card templates as a jig to set the angle of wing stagger and equal incidence.
For the F/F version the dihedral angle is set by cracking the lower wing down its centre line and keying the two sets of wing halves with the interplane struts, using the same jigs. The centre of lower wing is then pinned down and the jig sets the dihedral. Use spacers between upper and lower wings at centre (referring to plan for gap) and butt join top halves with upper 1/4 in fairing to strengthen.
While the wings are setting, make up the 'N' struts from 1/8 sq. When set, add fairing below upper wing c/section, join fuselage to lower wing, and fit N struts. Mount fin.
Attach 18 swg brass control horn as bellcrank mount and 22 s.w.g. light alloy elevator horn to C/L elevators which are joined with 1/8 dowel and sew to tailplane. Bolt bellcrank in position and make up controls, noting the lead-out guide at Port strut. Fashion the undercarriage legs and bind with thread at the axle end. Then sew to fuselage. Retain wheels with fuel tubing.
We used HMG dopes on the C/L model and Yeoman transfer decoration for F/F. When dope is dry mount engine and tank. For C/L this is retained by a length of fuel tubing secured by two 5/8 in woodscrews (see plan)."
Supplementary file notes
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Great_Lakes_Sport_Trainer | help
see Wikipedia | search Outerzone
ScaleType: This (oz12112) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Great_Lakes_Sport_Trainer
Wikipedia page addresses may well change over time.
For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.
Do you have a photo you'd like to submit for this page? Then email email@example.com
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2020.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.