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Oct 27, 2018, 07:58 PM
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AntiArf's Avatar
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Build Log

Handley Page Victor 46.5" span 30mm QX fans flight video


Will be some time before there's anything else to show, working on the wing and fuselage layout. As usual, the 3-view leaves much to be desired, correcting some obvious errors. Built the tail assembly with 1/32" balsa sheeted fin and stab, with the rudder and elevator to be iron-on covered to shave weight. The completed assembly with linkage is heavy enough as it is at 22 grams. Used internal linkage for the rudder and elevators, with the elevator hinge line not exactly scale, going off the 3-view drawing. The overall part perimeters are scale. The full scale aircraft has a semi-full flying stab, which would have short distances between the hinges and would be even more difficult to fabricate. There will be a bellcrank in the rear fuselage, connected to the elevator pushrod. I've used the rudder linkage setup with rudders at almost as steep of an angle as this model, without issue. For this model, the rudder pushrod will probably be routed along the fuselage top, angling down a bit into the rudder linkage arm, to straighten out the geometry a bit.

The elevator joiner bar wire has bent ends which operate the elevator torque plates, made from 1/32" ply sandwich plates. 1/32" ply was also used to set the gap between the plates, with a few CA layers added to the plates before gluing the sandwiched plates together, to set minimal clearance for the wires to fit into. The tighter the clearance the better, but the wires have to slide freely inside the plates. The wire ends need to insert into the very front/inside corners of the elevators so that the joiner bar rotates on a fixed axis, which is why there are CF wraps around those corners of the ply plates. You can't put anything in between the plates in that area, as the bent ends of the joiner bar wire enter there. Moving the elevators up and down, the ends of the joiner bar wire slide closer to the inside edge (open edge) of the plates. The bend angle should be set so that the wire ends come close to the open edge of the plates, as a larger bend angle will amplify any freeplay caused by the minimal clearance between the wire and the plates.

The elevator joiner bar uses a #2-56 Dubro threaded rigging point and a wheel collar, with a flat filed into the joiner bar center, all filled with thin CA/activator after tightening. Tweaking the pushrod s-bend, you can get it to insert in the rigging point hole and operate without any freeplay.
Last edited by AntiArf; Jun 07, 2019 at 05:51 PM.
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Oct 28, 2018, 12:46 PM
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Kevin Cox's Avatar
Nice! You are a building machine!
Oct 28, 2018, 01:03 PM
hdowding
Subscribed. Already getting some linkage ideas.
Nov 04, 2018, 08:05 PM
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AntiArf's Avatar
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Thanks Kevin and Harvey

Might get something done now, with a parts kit cut. The fuselage formers and wing ribs were a bit more effort to draw up than usual, for this subject. Added a bit a reflex to the wing ribs like the full scale, which seems a good idea given the smallish stab. The laminated formers are an added effort to assemble and cut out, but have the advantages of nearly continuous grain strength, where the 1/32" laminate seams are easily as strong as the rest of the part. They also use up otherwise useless scrap 1/32" balsa for the laminates, while making efficient use of the 1/16" balsa sheet also. All 13 fuse formers were cut from a single sheet of 4"x36". All but one wing rib (3rd rib outward) was cut from a single 4"x36" sheet also, experimenting to determine an efficient part layout. The 3rd rib outward requires 4 of them to be made, as the wing will be made in 3 individual sections.

The QX fans have hub reinforcing rings, cut from Revlon lipstick metal tubes with a pipe cutter. The are slightly expanded with a socket, for a tight slip fit over the bell, and then glued in place. A few of the slightly higher rpm 2s version of the fan had been known to come apart, at the seam welded rolled sheetmetal bell seam. One was ran unloaded without a rotor, but still seems an uncomfortable safety margin to run the 3s version without the rings. Both operators had grenade like shrapnel injuries from the magnets.
https://www.rcgroups.com/forums/show...rushless-Motor
Nov 06, 2018, 07:24 PM
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balticS2's Avatar
Very nice Bill. A Victor, specifically B2 XM714, is on my list. I'll let you do the heavy lifting on that shape.

Alec
Nov 07, 2018, 07:02 PM
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AntiArf's Avatar
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Thanks Alec. Saw a build of that camo painted Victor using the GWH plastic model kit, which appears to have the registration numbers included.

The wing center section was designed along the lines of "fill in the blanks as things progress", providing a basic structure to work from. This build was started with the intention of adding retractable landing gear, which forces cutting away the lower main spar in the area where the main gear will be located. The forward part of the wing has a CF rod on the bottom and will have either a CF rod or spar across the top, using the leading edge wing sheeting to form a D-tube type structure, for strength. The lower CF rod is now tied into the wing rib with a gusset since the photo below was taken, as a tack glue joint obviously wouldn't cut it. Working out the main gear retraction, the CF rod is located about as far rearward as possible to clear the tires during retraction. The steerable nose retract unit was built with aluminum tubing and a GWS plastic accessory parts kit mount, improving somewhat on the design used for my past Saab Lansen build. Also used GWS plastic parts for the main gear wheel truck frames, that fit perfectly in the metal clevises that attach to them. They're at least 1/16" thick and seem amply strong for the frames.

On paper the main gear retracts should work, although you really have to study the design to make sure there are no oversights. The idea is to have a rod running from a servo horn to the main strut, connected to the main strut near the wheel truck. The attachment point will be able to slide along the main strut along a short distance, which is necessary for the arrangement to work, when at near to full retraction. Using a 180 degree servo, the servo horn will need to be a disc type plate or possibly an X type horn. Maybe difficult to visualize until completed, but the idea will be to have a pin mounted in the servo plate, that will contact the rod when the servo has rotated nearly 180 degrees. Once the pin contacts the rod, the pin will serve as a cam that lifts the rod, so that the gear can fully retract into the wing bay. From what I can see in photos, it appears the full scale operates in similar fashion, although with a different mechanism. For anyone thinking about using a heavy servoless unit, the unit would need to be mounted in the rear of the wing to retract the gear forward, like the full scale. The wing is not thick enough in that area at this scale to house the unit, and the wheel trucks would contact the motor on the servoless unit before fully retracting into the wing.
Nov 08, 2018, 12:00 PM
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turbonut's Avatar
Looks good so far..The V bomber is such a cool looking jet...again nice work
Latest blog entry: In flight
Nov 11, 2018, 02:38 PM
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AntiArf's Avatar
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Thanks Turbo

Waiting for micro retract servos, so figured may as well build the outer wing panels. Originally the plan was to possibly tilt the inner panels up a degree or two, and then add the slight annhedral to the outer panels. Doesn't seem worth the added complexity for the small effect, although I still have the option. The wing panels are not glued together between the outer and inner panels (mating wing ribs at the 3rd rib outward) and have dowel pin locators (pic 4). The inner panel main spars will be cut in the center, where the CF rods will plug into tubing joiners. After installing the retractable gear, the panels could be laid flat on the table and permanently attached at that time. I figured it would be more difficult to install the retractable gear with the outer panels attached, making it more difficult to handle the entire wing versus only the center section.

Worth the effort of making the LE spars (pic 3) with the sweep angle bend. The bend point is tack glued, adjusted, and reglued until the angle is correct and both sides mirror each other. The tricky part is that they can't be laid on a flat surface when forming, as they are inserted into notches cut into the front of the wing ribs. When made precisely and matching, you have a better chance of ending up with matching wing panels, versus installing the LE sections as individual pieces.

The retractable gear assemblies now weigh 1oz, with three 9 gram servos, small nose steering servo, and a bit of linkage to be added. Not bad considering that a single servoless retract unit weighs over 1oz, less the strut and wheels. Pic 6 shows how the main gear unit fits into the wing, where the main spar below will need to be cut away in that bay. The thin 1/32" basswood spar at the top provides maximum room for the retractable gear, as there isn't much room to spare.

Pics 5 and 7 show the aileron servo mounting and cut away ailerons. The aileron headers on the wing side have stringer laminate stiffeners added near the bottom, so as to not interfere with the hinge slotting. The covering shrink would otherwise tend to bow in the header without the stiffening, given the wide spacing between the wing ribs. The braces at the bottom of the ailerons placed between the ribs serve the same purpose. Pic 8 shows the wing, ready to be removed from the table. The stringers that route to the aileron header have 1/32" balsa shear webs, creating a rigid spar. The 1/8" balsa main spar and 1/16" stringer at the top of the wing ribs are also connected with 1/32" balsa shear webbing. Much of the wing strength will depend on spars/sheeting to be added later in the wing front area, as the lower main spar will need to be cut away in the retractable gear bays.
Nov 12, 2018, 10:41 PM
Registered User
Wheel trucks look great.
You ..Have been busy
Altering anhedral could be iffy. It's purposed effect is to make a bird more agile/less stable. But it's an element in the overall design.. tricky to fiddle with one element in isolation.
Noticing that there isn't Any wing twist.. yet ? Bit surprised by that TBH.
Should be lots incorporated IMO.. based on 3 views and similar German configurations the Victors' designers Clearly 'emulated'
Presumably it will appear with the covering.. or?
Nov 12, 2018, 11:11 PM
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AntiArf's Avatar
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Thanks. Thought about adding some twist, which can be done with the bottom stringer installation and the leading edge sheeting. Almost always end up setting and tacking one or two bottom stringers in place while holding a bit of twist, to get both panels to match as well as possible. The planned LE sheeting also allows for twisting and tack gluing in place, then checking washout. The rib sections do provide dynamic washout, with the LE unusually high at the wing root and then tapering down at the thin section tips. Figured if the weight is kept reasonable that stalls shouldn't be an issue.
Nov 12, 2018, 11:50 PM
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stacker's Avatar
Looks real good Bill. Wonder if you could use one of the 4 in 1 quad speed controls to save a littl weight?

Take care—Stacker
Nov 13, 2018, 02:16 PM
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AntiArf's Avatar
Thread OP
Thanks Dave. The Emax12A units I'm using are pretty light. Already have them. Ran them before with these fans in the TU104 airliner mounted the fuse, not heating up at the current draw of these fans. Using a Castle BEC, given all the servos.
Nov 13, 2018, 08:26 PM
Ken Stuhr
The anhedral was put into the prototype to counter the dihedral effect of the sweepback. I have never found it to be 'destabilizing' on several of my jet models. Indeed, removal would likely result in 'Dutch Roll', which all of the Boeing and Airbus airliners have and require use of a black box on the rudders to tame. No reason to suspect there is a scale effect either, so suggest you stick with it.
Nov 13, 2018, 09:49 PM
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4stripes's Avatar
Great project!
Handley Page Victor: A Futuristic Style Proved To Be A Pinnacle Of British Design (7 min 46 sec)
Nov 13, 2018, 09:57 PM
Registered User
4stripes's Avatar
some dramatic footage...
HANDLEY PAGE VICTOR TRIBUTE (9 min 34 sec)


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