Reaction 36, 50 mm EDF - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-05-2021, 07:03 AM   #1
Dutkoski
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Reaction 36, 50 mm EDF


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I got the bug again, this being cooped up is causing me to think too much
So, I wanted to design something fairly simple and straight forward, one piece or optional to have the wing removable. Also, have the option of retracts or nothing. I saw the chuck glider I had made last year for the bigger model and saw the potential. So, I increased the model slightly to a 36 wingspan.

Im using my Profili airfoil program to design the wing, the root airfoil is a NACA 0014 and the tip airfoil is a NACA 2412. Profili plots the number of ribs very accurately, placing features such as spars, trailing and leading edges is real easy, plus, itll plot alignment building tabs on each rib.

So, I printed out the ribs, using nine for each panel. They will all be 1/16 thick balsa, 1/4 square balsa spars, with shear webbing. The covering will be 1/16 balsa, in front of the spars, open bay behind the spars but the ribs will have 1/16 cap strips 3/16 wide. Ill be using 9 gram servos for the ailerons. I simply stack two pieces of balsa sheet, tack on the rib drawing with contact glue and cut out the two ribs at the same time. I then use my Dura Grit 120 grit True Sander to bring the profile to final shape. I use my Dura Grit 120 grit hollow drum to make the servo lead access holes, this tool quickly cores out the holes.

The fuselage sides will be made from 3/32 sheet balsa, with 3/32 sheeting top and bottom.

The vertical fin and stabilizer will be built up structures from 1/4 thick sticks to keep them light.

The whole structure will be eventually covered in monocote.

I have quite a few RC Lander 50 mm EDFs still, and since they crank out around 425 watts on a four cell at just under 30 amps draw, one of those will be the unit of choice. And, I already have the thrust tube mould made from the original foam Avro Arrow design I did.

Not too bad progress for only 2 hours so far
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Old 06-09-2021, 08:23 PM   #2
cschimno
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Re: Reaction 36, 50 mm EDF

Hi John Interesting build. I have a question about the airfoil. Root 0014 and tip 2412. Is that the same as adding actual washout, but with airfoil changes.
Cheers
Carl
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Old 06-10-2021, 08:38 AM   #3
Dutkoski
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Re: Reaction 36, 50 mm EDF

Im not sure Carl about the washout, the airfoil change was primarily to add thickness for possible space for mini-retracts. Plus, I wanted to try using the NACA 2414 series as it is semi-symmetrical. If it dosent work, then I can rebuild a new wing using the symmetrical NACA series of airfoils without having issues rebuilding the wing root. At least, thats my line of thought.
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Old 06-10-2021, 09:00 AM   #4
Dutkoski
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Re: Reaction 36, 50 mm EDF

Life's little hick-ups got in the way, delayed my progress. But, still picking away at it. The horizontal stab and vertical fin are built the traditional stick method using 3/16 thick X 1/4 wide balsa. The rudder and elevator are solid 3/16 balsa sanded to shape. Turned out very light over all, 24 grams for everything.

The fuselage is your basic box structure, so far, no plywood yet. The sides are 3/32 thick balsa sheet, a 4X36 sheet for each side. The bulkheads, there are four, are all balsa, 3/32 or 3/16 thick. The 3/32 bulkheads are backed up with 3/16x1/4 balsa strips to provide extra strength and gluing area.

The fuselage inner edges are beefed up with 1/4 X 1/4 square balsa. This is for strength and to provide material so I can round over the edges.

The top surface of the fuselage is sheeted in 3/32 balsa, cross grain, the bottom surface is covered in 1/16 balsa, cross grain.

The wing will be detachable in the traditional manner, alignment dowels at the front and two small retaining screws at the rear. This will allow access to the EDF unit, ESC and the receiver when needed. The battery compartment will be under the huge solid canopy. This location will provide lots of fore and aft space to adjust the battery location, to facilitate balancing the model.
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Old 06-10-2021, 10:04 PM   #5
Dutkoski
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Re: Reaction 36, 50 mm EDF

The fuselage is 95% built. Just the nose cone needs to be made and attached. Then a sanding to round over the sharp edges. The fuselage, horizontal stab and the vertical fin tips the scales at 4.5 oz.

The hatch turned out better than expected. The sides on the fuselage and the hatch maintained their curve and match up perfectly. Its held in place by tabs and secured with a small magnet.

The overall large size of the battery compartment is great, shown are two 2200 Mah batteries, which are old and big. Ill be ordering a couple of four cell batteries tonight, probably in the 1800 mah size. The EDF draws around 28 amps.
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Old 06-11-2021, 08:41 AM   #6
Dutkoski
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Re: Reaction 36, 50 mm EDF

Ordered a pair of these 4S batteries last night, pretty good price, $23.99 each. Amazon is so convenient for ordering stuff, its becoming a dangerous habit I might need counselling soon.
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Old 06-12-2021, 09:29 AM   #7
Dutkoski
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Re: Reaction 36, 50 mm EDF

Im at that stage now, gotta build the wing. This is my first built up wing in decades, Ive pretty much gone to the dark side making foam core wings or composite wings. But, for this model, I wanted it to be all wood. So, I made the alignment jig ( tapered strip of balsa ) to hold up the trailing edges of the ribs at the proper height and dry fitted the ribs and spars.

Amazingly, all 9 ribs assembled beautifully and in alignment.

I even dressed up the fiberglass thrust tube with a bit of paint why not
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