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Old 10-14-2018, 11:21 AM   #41
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Re: Vintage Pattern .60 Phoenix 8 scratch build


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The horizontal stabs are rock solid as they say, just needed some epoxy with micro balloons to blend in the joint.

This morning, I designed the retract mounting plate and determined where the aileron, the flap servo and the retracts will get mounted. Used my Dura Grit rotary burrs to make all the recesses. Love using these burrs as they are sanding, not cutting, so you barely feel them removing the foam and balsa. As a result, it's very controllable using them.

The servo wire channel will be caped with 1/2" wide balsa, either 3/16" or 1/4" thick, whatever I can scrounge drom the scrap bin. The servo pockets will have a 1/16" plywood floor epoxied in so the servo rails will have something more substantial to be bonded too.

The aileron and flap servos are Hitec HS-225MG's, I know the aileron servos are sufficient, and I hope the flap servos will have enough staying toque. I intend to use a small control horn on the servo and a larger one on the flaps to take advantage of the mechanical leverage. I'll also be using a 6 volt system, not the standard 4.8 volt. If not, I have bigger ones.

Now to duplicate this in the other wing.
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Old 10-18-2018, 10:06 PM   #42
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Re: Vintage Pattern .60 Phoenix 8 scratch build

Looks good there John, do yourself a favor and add a false rib and two dowels or six dowels on you retract plate or added safety. You fly off grass don't you? I would hate seeing you rip the LG on your maiden.
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Old 10-20-2018, 09:46 PM   #43
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Re: Vintage Pattern .60 Phoenix 8 scratch build

Yep, I always use the six dowel method of anchors the retract mounting plate in the foam cores. Never had one rip out yet.
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Old 10-21-2018, 08:34 PM   #44
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Re: Vintage Pattern .60 Phoenix 8 scratch build

Can you guys explain the dowel method? Does it extend right through to the top of the wing and cut flush? Or just enough to hit the skin on the top wing?

Also "False rib"- where does that go?
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Old 10-22-2018, 05:44 AM   #45
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Re: Vintage Pattern .60 Phoenix 8 scratch build

The dowels go through the retract mounting plate and through the foam core, up to the balsa skin or close to it. The rib method is harder to do, but the retract plate gets epoxied to it, you cut a slot for it and the parts would get epoxied in place. Both methods work well, the dowel method is easier to do. Both methods anchor the mounting plate but if your airfoil has a thin profile, like a jet, then the false rib(s) spread the stresses better within the foam.
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Old 05-04-2020, 10:12 AM   #46
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Re: Vintage Pattern .60 Phoenix 8 scratch build

Well, bouncing back and forth between projects. This morning, I applied the final coat of resin on the wingtip tank plug, it'll get wet sanded and buffed this afternoon. Hoping to get it into parting boards this evening.

Also, after judicious measuring and luck, I cut off the intended cowl section. Went ahead with the E-Filte Power 60, it barely fitted in the cowl. I know the motor might not give me unlimited vertical but that's fine. I am intending this model to be just a sport flier. If I need to put in another motor, I have the moulds to make another part(s). To toughen up the edge of the cowl, I'll most likely laminate some carbon fibre veil on the inside.

There will be a clearance of 1/16" between the spinner and the cowl. The firewall is 1/4" birch plywood. It actually get mounted so there is a lip retained from the fuselage skin. So some 1/8" to 3/16" standoffs will be required behind the X motor mount.
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Old 05-04-2020, 02:21 PM   #47
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Re: Vintage Pattern .60 Phoenix 8 scratch build

Nice work, John. It's been a long time since this one saw the bench!
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Old 05-05-2020, 01:46 PM   #48
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Re: Vintage Pattern .60 Phoenix 8 scratch build

You can say that again, Max.

Figured I had better get at these projects so I'll have victims for this summer

The resin was not fully cured on the wingtip tank last night so will get at it tonight maybe. But, I did make a nice foam work cradle for the model out of scrap pieces. Turned out quite nice I think.

Also, laminated inside the front of the fuselage and the rear edge of the cowl, 5.5 oz carbon fibre cloth to add strength and rigidity, turned out very nice as well. You cannot see it, but the seam along the top of the fuselage was also dressed up, just a finish sanding needed.
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