Hymax (oz11006)

 

Hymax (oz11006) by Mark Miller 1986 - plan thumbnail

About this Plan

Hymax. Radio control powered glider model.

Quote: "65 inch span powered glider for 1.5 cc diesels and two-function R/C. Hymax, by Mark Miller.

Simple, conventional construction and straightforward no-fuss diesel power make Hymax an ideal first R/C model; you can power it to height on a short motor run to keep on the right side of the neighbours then enjoy the silent pleasures of thermal-chasing or fly the tank out performing a wide variety of gentle aerobatics. The model will loop easily, roll if asked politely and even cope with inverted flight! If you're new to R/C Hymax offers a forgiving and docile introduction to the hobby - if you're an experienced flyer you'll enjoy its excellent gliding performance. See you in the lift!

Here's a two-channel radio model which combines a lively aerobatic performance under power with a respectable glide for thermal soaring. As such, you will never be stuck for something to do whilst flying Hymax; if there's no lift to go after, try instead rolls, loops, inverted flight (yes, really!) and spins. Under power the original 'grooves' like a full-house radio job yet is as slow and serene as a free flighter on the glide.

Thus the newcomer to R/C flying can, with a competent flier to hand, first 'steer' Hymax' on the glide then, when ready, progress to handling it under power. If noise is a problem at your flying site then Hymax's rapid climb with a 1.5 cc motor (AM15 diesel with silencer on the original) is helpful, as only a short run is needed to haul it up to a decent height for thermalling.

The nose-mounted motor produces less drag than the pylon variety, gives no trim change when it cuts, and allows the R/C gear to be moved further aft, improving its odds of survival in a prang. It also gives Hymax the appearance of a pure glider when airborne. The original has completed several hundred flights to date without needing ANY attention whatsoever. So, for the man with limited time, a powered glider like this is definitely the way to pack in the flying hours with minimum fuss.

Wing: This is intentionally on the strong side to withstand aerobatics, and spiral dives out of cloud (guilty!) so make a good job of the dihedral breaks to avoid weak spots. Choose straight and even-grained stock, taking care to build each side to a similar weight and to keep the wing tips light. The wing consists of four similar panels each built individually on the building.

First make an accurate 1/16 ply template for R1 and use to cut a full set of wing ribs, preferably from quarter-grain wood. When making the tip ribs, check that corresponding ribs for each wing tip have exactly the same profile..."

Hymax, Radio Modeller, December 1986.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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Hymax (oz11006) by Mark Miller 1986 - model pic

Datafile:
  • (oz11006)
    Hymax
    by Mark Miller
    from Radio Modeller
    December 1986 
    65in span
    IC R/C
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 10/03/2019
    Filesize: 775KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ
    Downloads: 607

Hymax (oz11006) by Mark Miller 1986 - pic 003.jpg
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Hymax (oz11006) by Mark Miller 1986 - pic 004.jpg
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Hymax (oz11006) by Mark Miller 1986 - pic 005.jpg
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User comments

A question about dihedral: In the plans on the left side it gives a wing tip dihedral of 3.5" and on the right side it states a "r". What is this "r" value? Thanks.
Mark P - 09/01/2020
It's hard to read, but I think it says 3-1/2 inch on the left, and 1 inch on the right.
SteveWMD - 09/01/2020
Thank you Steve, for that correction. I would never of thought that that was actually a "1".
Mark P. - 09/01/2020
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