1/2 Wave (oz1254)


1/2 Wave (oz1254) by Harvey A Thomasian 1954 - plan thumbnail

About this Plan

1/2 Wave (Half Wave). RC gas model. 1/2A class radio control model for .049 power, sport rudder only.

Quote: "This is one of the finest small RC jobs yet published. Because various experts who have seen it fly recommended that MAN print plans, you can bet your boots it is a real performer. Hot .049's to .065's.

The 1/2 Wave began as a small radio job designed to duplicate the flight characteristics of larger radio controlled ships. To this end we have built into the ship good stability, both directional and longitudinal, excellent wind penetration, and maneuverability.

The ship is of robust construction - take a glance at the plans - and will take all kinds of beating without falling apart. The construction is conventional in most respects and sufficient information is given on the plans to enable one to assemble the ship with ease. Each piece of balsa is a common size obtainable in all hobby shops. There is sufficient room in the fuselage to accommodate any of the smaller receiver units on the market now. Our ships have been flown with the Lorenz and the North American two-tube receivers. The North American job is shown on the plans.

Much fooling around was done with landing gears before the one shown was chosen. Inasmuch as the nose wheel is mounted on a trailing link, there isn't much possibility of its bending back. Its semi-retracted position prevents nose-overs in deep grass common to long dangling type nose gears. The moment arm between the nose wheel and main gear is short, minimizing the effect of leverage and permitting the ship to be steered by rudder during take-off. The main gear is located under the center of gravity to lessen a nosing down tendency from thrust during take-off, and shortens the take-off run.

The radio receiver is mounted solid to the ship, and no difficulties have been experienced here, although it would be wise to check the wiring occasionally for cracks from vibration. The Sigma 4F relay is mounted solid to the ship on the pine relay block, and has worked out well in this position.

Each wing half is built complete on the plans, including leading edge sheeting and cap stripping. This eliminates the addition of parts after the section has been lifted from the plans and thereby prevents warping. Only the center sheeting, rib, and dihedral braces are added later. There is no construction on the underside of the wing as it is flat and most of its strength belongs in the upper curved surface, anyway. Do not forget the 1/16 in negative incidence in the wing tips. It would be wise to watch this during covering and doping. The left half wing is constructed by oiling the opposite side of the plans and working from it.

Escapement installation follows conventional practice. We used the reliable torque rod method of rudder control as it is easy to adjust and maintain. The forward position of the escapement keeps the CG forward and allows easy inspection and adjustment..."

Update 14/10/2013: Have replaced this plan with a clearer copy, thanks to theshadow.

Update 03/07/2017: added article, thanks to RFJ.

Supplementary file notes



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1/2 Wave (oz1254) by Harvey A Thomasian 1954 - model pic


1/2 Wave (oz1254) by Harvey A Thomasian 1954 - pic 003.jpg
1/2 Wave (oz1254) by Harvey A Thomasian 1954 - pic 004.jpg
1/2 Wave (oz1254) by Harvey A Thomasian 1954 - pic 005.jpg
1/2 Wave (oz1254) by Harvey A Thomasian 1954 - pic 006.jpg
1/2 Wave (oz1254) by Harvey A Thomasian 1954 - pic 007.jpg

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User comments

Hi Steve, Thanks for what you are doing in preserving our plan heritage. I have built a couple of models from your plan data base.
Latest is the 1/2 Wave from 1954 [main pic, 004-007]. It was designed as a rudder only small sports model back in the day when Young Elvis Presley was just starting out! I flew it for first time on 1st August and thankfully it handled the gusty conditions well. I enjoyed four test flights only adding some nose weight.
The unusual trike/ taildragger configuration was what sold it to me after enduring nose over landings at the end of an otherwise perfect flight from my old Veron Cardinal. I beefed up the wire for the main gear but the nose wheel is as plan, so far only smooth landings on the grass we fly from here in Dorset. When building I added elevator and throttle control to keep it safe in our smallish field.
Power is a PAW 55 diesel RC which starts and throttles really well. Build took eight months of weekends, delay mostly to solve the little problems that came along throttle linkage, tank placement ( made up a tinplate one from old fuel-can) but nothing major and all part of the fun. Rudder is fishing line closed loop. The elevator a lightweight plastic snake. Throttle control via wire pushrod.
I imagine nobody has flown this for about sixty years, judging by lack of modern photos on Outerzone, hence sending in my own, hope they work. It really has the vintage look of what our American friends used to call a fine small RC “ship”. Regards,
Ross King - 12/08/2022
Hi Ross, This looks really good and I'm thinking of building one either with a Mills .75 or a Frog 80 diesel. Yours had a throttled PAW - would unthrottled be OK but with rudder/elevator control?
Best wishes
keith Hale - 02/12/2022
Hi Kieth, Good luck with your build. I have the engine flat out most of the time and seem able to come back into wind with the elevator. Our field is surrounded by houses so it seemed wise to have some insurance if it got away from me.It’s a good plan to only put about 25 to 30 seconds worth of fuel in the tank the first time you fly it to see if you can control height gain etc.
I made a plug in engine cowl ,bonnet and windscreen . The wing bands need a steep angle to retain wing in place so I band wing on first then fit windscreen and hold with two more bands.Dowel through balsa windscreen.
I have a lot of fun doing loops spirals and just buzzing around,far more fun than electric,but oily??
Ross King - 18/12/2022
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