Come on man. Not talking basics here.
The horn (and the hole) is where it is because the pushrod is perpendicular to the surface, not parallel.
Hope to hear from you over the weekend.
Cheers

Who's Mark Kettle? Who's Wibberley?

Must be 1805.
55 minutes to happy hour. Enjoy. See you tomorrow.

Mark Kettle and Wibberley are the same 

Back to the :-

-horn
-hole
-and symmetrical control

I'll do some drawings to help   ( to follow )

I think this is not helping with the control and set up of the model  

Hi Mark,
You made me take a second look.
You are right about the pushrod not being at right angles to the radius arm of the horn, leading to asymmetry, like aileron differential.
But,
All it does is produce more up than down for the same servo travel. No effect on our problem.

A closer look at the stabilizer photo showed up an entirely different problem!
Spar delaminated from stab! See pic.

Causes flutter? Going to epoxy it and check the other side too. Also going to add washers under the stab hold down bolts.

Your landing trim comments made me realise that was exactly what i was doing, except for the fact that i was flying the ENTIRE FLIGHT with that trim!

Well, well. Never too old/late to learn.
Thanks.

Good I'm sure you'll get it flying better, and if your looked over the plane again that's good.

Shall I still do the drawings it will help new starters with the hobby, to help understand more about importance of control movements and set-up?

It could help others learn and you could be a great example in how you solved your problem with your plane/model and got it flying better.
Lets face it KK, alot a RC flying is solving problems to get it to work better, fly better and start having fun.  

Must have done my share of it (ie, problem solving), considering i started in 1966! But that's another story

Anyway, took out the pushrod, hammered the kinks straight, zeroed the sub-trims, reset the servo arms.
While checking if the servo arms snag, guess what i found.
A washer and a C clip stuck under the magnet for the hatch hold-down!
Must have been there from day one. Clip flew off as usual so spent an hour sweeping the floor with a magnet. Till wife found it (as she always does) within 5 secounds, ten feet away.
(BTW she's the RC Aunt who gets mentioned on this forum once in a way. Been into aeromodelling since we got engaged - 1980!)

Latest issue (March) of RC Soaring Digest has a five page article called Linkage 101. Here's what it says about differential throw:
"The pushrod must be connected to the control horn and servo arm at a 90 degree angle from a line between the hinge line and the pushrod attachment point to avoid unequal movement either side of neutral. In the “good old days,” we adjusted the angle between the pushrod and aileron horns or control horns to provide aileron differential but that isn’t necessary with modern computer radios."

A young member recently posted a pic of his horn setup, asking if it was OK. Was really grateful for my brief reply - TURN IT AROUND.

You could put up a few pics/drawings of horn/linkage setup. But start a new thread. Would get drowned in this one.

And don't even look at my workbench 

Good same book excellent - 

I'm glad your sorting your model, I'll start a new topic on horns and settings etc like you say -but start a new thread it would getget drowned in this one.

Mark
There was a lot more stuff for you in my post than just sorting out my model....

Like having the same book? And other things...

Coming back to the topic, looks like i have to take out my amphi's

@rcpilotacro
Thought the whole point of floats was to drift...
If you catch my drift, that is...

Suspect stuff like this puzzles some members.
Maybe we (you/me and several others) should decide
whether to be straight (forward) or gay (abandon) on the forum

BTW Amphies may be theatrical. HaHa. Gotcha.

KK is there a a blog / topic on your plane landing fast?  if so send me the link, and we get back to talking float planes a not drift or be drifting into the India Ocean with set-up

Another float flying video to bring the blog back on track :giggle




Fun day in Leicestershire.

No, but tomorrow will test and let you know. Separately.
Without hijacking the floatplane thread.
Sorry about that, just got carried away talking to a new friend.
Especially when you posted a pic of that book...

No problem KK

This was a good float day

Near Northampton with British Water Association



 

Lovely. Eye opener for guys like me who never got their feet wet!

Just saw the Seamaster video. 
The name Ken Willard is enough to bring tears to my eyes. We were all Schoolboys once.
Still have a Schoolmarm, one at home and one in the hangar.

Also have a Shadows disc, but nothing to play it on.

You don't know it yet, but you have a covert.
Your posts enabled me to recall a name i had been trying to recollect for 30 years.
Don McGovern and Piranha.

Forget linkages. Just drive a floatplane thread. India is virgin territory for the subject.
Wish you luck.

Mark

embedding youtube video here is different from RCMF, see image (Basically http:\\ needs to go url & slash url isnt needed)