Bolkow Junior (oz1708)
About this Plan
Bolkow Jr. Scale rubber model. From Model Aircraft July 1962.
Quote: "Ray Malmstrom's Bolkow Junior.
Planfile includes article.
Quote: "Here's an easily built, tough little rubber powered scale job that really flies. The helpful sketches on this page clearly show the simplicity of the construction - the fullsize blueprints fold out overleaf..."
Update 10/03/2021: Added article, thanks to JeffGreen. This is essentially a scan of the same document as the planfile, but this here is clearer to read.
Update 12/03/2021: Replaced this plan with a clearer copy, thanks to JanNovick.
Supplementary file notes
Previous scan version.
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by Ray Malmstrom
from Model Aircraft
Scale Rubber F/F Civil
all formers complete :)
got article :)
Found online 23/10/2011 at:
Format: • PDFbitmap
Credit*: aeromeddeler, rchopper56, JanNovick
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ScaleType: This (oz1708) 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/Malmö_MFI-9
Wikipedia page addresses may well change over time.
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User commentsI have a copy of this plan direct from the Aeromodeller of 1962. It is a charming plan, clearly designed to encourage young modelers and those gaining experience with free-flight models (an irony, but a result of the cheap r/c world we live in). An interesting aspect is that the plan was printed as an actual blue-print, in blue with white marking. I have built one example (sadly eaten by a tree), and can attest that with an Airsail 6” propeller and a single loop of rubber that its flight performance is superb, and that trimming is almost unnecessary, as the slipstream torque is more than enough to set it in a gentle climbing spiral, and the windmilling prop is then again sufficient to set the model into a gentle opposite-handed spiraling path back to the ground. Endurance is a good 30 seconds, without trying too hard. Although I cannot prove it, I suspect another loop of rubber would improve performance dramatically. The fuselage is noteworthy for only twisting very slightly when under rubber load, which is very important for stability and the new modeler. With today’s technology, trim tabs of transparent plastic are a great idea for easy control. I also found that ballasting was totally unnecessary. I am considering building another one, but this time r/c’ing it with the guts of an el-cheapo Nine Eagles Su-26MX or P-51 after I have flown one of those literally into the ground ! With Kind regards,
MartinLaGrange - 11/05/2013
I have made two of this fantastic Malmströms design. He definitively WAS a genius. How much we missed him. By the way, the model was published in MODEL AIRCRAFT, not Aeromodeller. Aeromodeller purchased Model Aircraft magazine in 1964 and from the January 1965 issue, it was incorporated to Aeromodeller with several features including Wings Club and Topical Twists. Best wishes,
Eduardo Barriga - 13/03/2021
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