OV10 Bronco by Planeprint

[davidk]

Time to start the Bronco.

[Michael]

Wingspan?

[davidk]

Wingspan 1400mm / 55.1 inches.  Printable in 2 versions, A or D, and with or without the sponsons on the sides of the fuselage.  I've printed the short nose A version with the sponsons.

[davidk]

The rear 2 sections of the main fuselage are made up of 4 printed parts... tops and bottoms.
The gold piece is a crossbar brace.  The carbon fibre tubes run through the fuselage and through this crossbar.
There are a lot of alignment tabs between these 2 sections.

[davidk]

Twin booms done.  The parts are so similar that it's tough to tell left from right.  Planeprint designs an "L" and "R" into parts.

[davidk]

Really nice hinging system.

[Michael]

Impressive design and engineering.

[davidk]

Very good structure on this OV10.  There's a cross-brace in the fuselage and the front landing gear is supported by 2 6mm CF tubes crossing over sections.

[davidk]

Outer wings are done, so it's on to the landing gear.  Since the brass threaded inserts worked so well for the L-39, they're going into the Bronco.
I've got a bit more to work with so I'm using a 3mm x 6mm threaded insert this time.
But, there's always something.
Pushing that long an insert through melting plastic allowed that melting plastic to feed into the open end of the insert.  Completely filled the 3mm interior.
So, I did what anyone else with this problem would have done... I left to watch a movie.  The Beekeeper with Jason Statham... excellent.
When I came back, I took a 3mm long set screw and screwed it into the threaded insert flush with the end.  Now, while melting, the plastic has no where to go but around the insert.
Remove the 3mm set screw and all is clear.

[davidk]

The rudder servos Planeprint recommends are small 4.8g Hitech HS-40.  I think they're too small but there's only enough room for these so they'll have to do.  The servo cover screws into 4 posts, but there's no way to get those posts situated perfectly.  So, Planeprint instructions are to screw the posts onto the servo cover, then add a drop of CA to the bottom of the posts and put the cover in place.  When dry, take off the cover and secure the posts with more CA.  Then the servo is attached to the servo cover with double sided tape.  Worked out well.

[davidk]

The OV10 has inner and outer flaps... which are on either side of the motor fuselage.  A 6mm CF tube is glued into the inner flap.  That tube then runs through the motor fuselage. A small connector is glued into the open end of the CF tube.  This connector fits into a slot on the outer flap but is not glued... it's this part that actuates the outer flap.
A servo is put in place inside the motor fuselage.  A control horn is snapped into place around the CF tube and the servo is connected to the control horn.  I don't think there would be any way to get the left and right flaps aligned enough to use a "Y" cable and 1 channel, so 2 channels will be used and the flaps can be adjusted.