Building a 50% ASW 22

[Len]

Thats a big flap!!

[Rossco]

There's a joke in there...... Anyone?

[Rossco]

Evening all, not much to show tonight but I did get some more done, do the second flap has now had the face trimmed and I've routers a further 5mm off the upper skin to allow the flap to roll inside the trailing edge of the wing once hinged. The resultant gap as mentioned will be filled with a Fibreglass wiper that is glued to the leading edge of the flap. Having thought long and hard about how to lay in new servo wires I'm going with a very long drill, but I'll get to that a little later but needs to be planned now as I've also measured out the servo bays to drive the flaps and the main wiring looms must be accessible from the servo bays while not crashing into the airbrakes.I forgot to mention so as not to cut any holes through the sheer webs, my servos are all mounted behind the spar along with all wiring. This also means I only have very short linkages all of which are hidden inside the skin with 20mm of leverage between the hinge point and the centre of the pivot, so
Loads of leverage there.
So here is the brake down for flpap control horn points I/B flap is 1780mm long going to put control horns 450mm off either end
I/B flap is 2170 long and going to mount horns 600 mm off either end.

Anyhow that's all for tonight

[Rossco]

Still a long road but more progress today, 3 months to get this thing flying.....

So today I cut out the 4 flap servo bays and drilled two very long holes from both root and tip of the inboard panels and hit target with some carefull drilling using an alloy tube and a drill bit glued in with thick CA. My drill bit is now 2.4 meters long..... and meet in the middle of the wing touching on all 4 servo bays and no holes through the skins...

So all in all I'm pretty happy.

Next up is to check the movements with some temporary hinging and if all good then reproduce everything I've done to the opposite wing.

In the mean time I have to order some high grade silicon wire and order a swag of servos from the states.... about 2k worth..... ouch! thats 14 in the wings alone + 5 in the fuse and a servo programmer for good measure.

cheers Rossco.

[Tom]

What kind of servos you planning to run? And then what kind of power to make them move?

[Rossco]

Hey Tom, well after a chat with a well respected member of a uk demonstration team I've decided to
go old school with the 22 and run Hitech digital programmable servos with the recommended heavy gauge wiring and plugs in combination wih the kickass futaba 18mz
I did some servo hunting yesterday and found its a toss up between cheif aircraft and servo city for the best prices as I can buy them overseas at a fraction of the price I pay here. It had also been mentioned to me that Hitech over spec what is said on the box compared with other servos, no problem. I'm going big grunt and big wire to provide sufficient power and minamize voltage drop on 6 volts. At this point my servo of choice for the trailing edge an rearward is the hs7950th. I've been using this servo for a couple of years now on the big elevator of my 40% schweizer 1-30 and ailerons ad thus far havnt let me down, so I'm happy with them and I trust them.

[Tom]

Good choice.....the 7950 will also run on 7.4v.....

[Rossco]

I did see that, intersecting idea I'll check what the voltage it at the outer most servo when I fire things up. I've had really good success with smartly expanders and regs so will probably go this way or emcotec expanders and regs with dual receivers.

[ARUP]

There's a joke in there...... Anyone?

Why... those flaps are so big that if Rossco cycled them on the ground at the JR then Japan will get hurricane strength winds offshore next week!

[Rossco]

nice work thankyou.