Just Right (oz15057)
About this Plan
Just Right. Radio control sport model, for electric power. Wingspan 38 in, wing area 267 sq in.
Note the Frank Ehling Just Right (oz2492) design first appeared in American Modeler, Nov 1958. This here is a later redrawn version for RC with electric power. Electric RC conversion by Tom Binkley, 2013.
Direct submission to Outerzone.
Note this plan is stamped as Archive #003292 from the Cooperative Plans Service. See their website at www.co-op-plans.com
Update 24/2/2024: Added article, thanks to Tom Binkley.
Quote: "Just Right, first published in November 1958 American Modeler magazine is simply too attractive to resist. No designer is named on the plans, but Just Right was an .020 powered free flight model that spanned 33 in and featured a built up wing and an all balsa fuselage, fin and stab.
It seems an ideal choice for a 3 channel, electric R/C conversion and it seems 'Just Right' for night flight. While the basic lines are true to the original, the fuselage presented here is stick framed and covered with semi-transparent film so that LED lights can be added for night flying.
With or without the added dimension of lighting, Just Right is a delightful, easy to build and easy to fly Parkflyer.
Readers of RCMW-FSP are likely familiar with the many LED lighting options available to model aviators, including the Flexible High Intensity LED Light Strips used here. We'll see how easy it is to add a new dimension to your flying.
You will need a brushless motor weighing under 50 grams, a 12A ESC, two 6 gram servos, a micro receiver and a 500 to 610 3S LiPoly battery. The lighting system uses all white LEDs, less than half of a strip and about 8' of light gauge wire. To get the red and green colors, transparent red and green SoLite is used on the respective wingtips. Transparent yellow was used on the rest of the model.
You will need 3/32 balsa for the wing parts and 1/8 balsa sticks for the fuselage and empennage. A pair of light 2 in wheels, .062 and .032 music wire and a little 1/32 plywood complete the package.
Start construction by cutting 3/32" balsa ribs, spars, trailing edges, gussets and wing tip parts. Using a template made from a photo copy of the rib glued to 1/32 ply, or cereal box cardboard, cut 14 ribs slightly oversize. Stack and pin them together, and sand them to finished shape.
Cut the notches for spars and trailing edge with a razor saw or razor blade. Use a rat tail file to shape the leading edge notch. If you plan to install lighting, drill a 1/16 diameter hole in the ribs just behind the spar for the lighting wire.
Once the ribs are made, measure the space between the upper and lower spars notches and cut the shear webs out of 1/16 balsa to that dimension. Shear webs can be vertical grain or span wise grain. Trim 6 shear web ends to the dihedral angle..."
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User commentsI was surprised and very pleased that my version of Frank Ehling's Just Right has made it to Outerzone.
If you would welcome them, I can provide an updated version of the construction article and the original plan.
Tom Binkley - 19/01/2024
I have many pictures.
Tom Binkley - 19/01/2024
Hi Tom. Excellent. Sounds great! Send us everything you have, and we'll add it here to this page. Just email everything to firstname.lastname@example.org
SteveWMD - 20/01/2024
Photo here of the framing [pic 003]. It was an easy and quick build, and a delight to fly.
Tom Binkley - 21/01/2024
My thanks for the masterful structural, effective, and elegant design by Tom Binkley for the RC e adaption of the Frank Ehling's, AMA hall of fame'r, you don't get in there for nuthin you know!, original outline. and hats off to Tom for bringing this gem to our attention once again. An absolute beauty to behold, originally outlined by none indeed I'm smitten. You just know it'll spread its wings and fly just like an angel. Sweeet.
Do remember to click on the link, https://outerzone.co.uk/plan_details.asp?ID=2492 to see the 1958 original. I think Tom's is far superior structurally than Frank's in terms of weight, however obviously not as robust, understandably so however, considering it's not a freeflighter. Happy contrails,
clem - 21/01/2024
Hello Tom. Please do send construction photos. They would be most helpful.
Greg Knipp - 22/01/2024
Two more pics of the Just Right here [004, 005].
Tom Binkley - 22/01/2024
Thanks Tom. I'm curious as to power set up and CG too.
Greg Knipp - 25/01/2024
Good catch Greg! It's not shown on the plans, but was in the construction article. Balance on or just behind the spar. The prototype has a Turnigy 2822-17 1100kV motor. It is heavier than needed. With an HD 9070 prop it draws 9.7A at 10.3V for 100W. On 2S it's 6.4V, 7.3A for 47W. I recommend the E-Max 2822 motor. It's a little lighter, inexpensive, rugged, same power.
Tom Binkley - 25/01/2024
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