Two Fowler Flaps - One Channel - Zero Fun
My Spektrum DX7s transmitter maxes out at seven channels. This airframe ideally needs eight channels, with two devoted to the flaps. Wth the limitation of my radio however I'm forced to use a Y-harness for the two flap servos. I knew setting up these big fowler flaps with no electronic means to fine tune them was going to be a challenge. And guess what, it was.
Here's the fowler flaps before connecting them to the servos...
The linkages run internally which is nice but complicates any adjustment process. Here they are both hooked up...
Time to see how they work out. I adjusted each so they were even when closed...
At half flaps things are still close but we're starting to seem some drift...
And at full flaps we're way off...
Grumble Grumble Grumble
I more or less expected this but was hoping by some miracle I'd get lucky... nope. With no way to adjust these electronically I had to figure this out mechanically... oh joy. After poking around I discovered the culprit. This is where the servo linkage attaches to the flap...
As you can see these guys weren't installed accurately...
So I yanked one out...
I drilled a new hole & re-installed the pin & what'd ya know, it worked!
Both flaps travel the same amount (plus/minus a degree). Close enough, that'll work...
So that actually wasn't as bad as I expected, very happy to have those working.