[The moving runway thought puzzle]

This question would only make sense if the aircraft was driven forward by the wheels - which, of course, it isn’t

[Basingstoke electric fly-in]

[Basingstoke electric fly-in]

[Basingstoke electric fly-in]

[The way we were....]

Ha! Hullavington in the 60s. BristolRCMAC

[Cancelled - Basingstoke Fly-in]

[BMAC Electric Fly-in]

[BMAC Electric Fly-in]

[Harrier Jump Jet- The aeromodelling Holy Grail !!!!]

How do you make those beautifully neat lightening holes, Tony?

[SkyMule connectors]

Thanks. That's what I wondered. You've obviously got better eyesight than mine

[SkyMule connectors]

can anybody who has a Durafly SkyMule tell me what battery connectors it uses, please.

[Black Horse Cessna Bird Dog spare hatch]

I don't recall anything in the instructions about differential - I usually start with some when I first set a plane up. I started with the most forward cg of those recommended and then, after the first flight, added yet another wheel balancer to calm it down. I can't tell you the exact position now without re-assembling it.

Sorry, I don't have a spare cabin hatch.

[Black Horse Cessna Bird Dog spare hatch]

Martin, I've recently maidened one of those so I'd be very interested to hear how you get on when you get to that point. I found that, to get it to go round corners reliably, I had to use quite a lot of aileron differential and mix quite a lot of rudder with the ailerons.

[Simulator for macs]

I use Aerofly Professional Deluxe on my iMac where I run OS X mountain lion. It's a good simulator although its selection of models is biased towards continental Europe and I had to swap over a couple of the connections on the lead which SMC sent me to get it to work with a DX6i. If you get this one I'd be interested to know how you get on.

[Just a bit at a time.]

1.376" perhaps

[Tip-stalling]

Can anyone explain why it should be the inside wing which stalls first in a turn? Since the outer wing has a down-going aileron and, therefore an increased angle of attack I should have thought the plane would tend to fall outwards.

[Anyone for a Tiffie?]

If you haven't got a tripod just rest your elbows on the edge of the table while you squeeze the shutter release gently.

Of course nobody will be able to tell it was you that took the picture but you can't have it all ways.

[Anyone for a Tiffie?]

Forgive me stating the obvious BEB but I think your chronic photographic problem is not focus but camera shake.

[WELL THERE'S YA PROBLEM !]

Both antennas horizontal across the fuselage? Doesn't sound right to me. The fact that you had the satellite body vertical isn't really relevant - it's the attitude of the antennae which counts

[another wot4 crash caused by radio failure :(]

It doesn't sound like a radio failure to me. Have you checked the elevator control linkage, especially the the screws which clamp the control rod to the servo arm. These can move and then jam if the screw isn't really tight.

[The 'share your photos' thread (not model flying)]

Ultimate, you seem to be able to charm the birds down from the trees.

[The 'share your photos' thread (not model flying)]

It's definitely a Phylloscopus warbler, either a willow warbler or a chiffchaff. Judging by the dark legs and the muted over all colouring I'd go for chiffchaff.

[Top-hinged ailerons]

Thank you Will-o. That is very clear.

[Top-hinged ailerons]

I think you, Simon and BEB have provided two distinct and consistent explanations of this.

i would now like to ask why, with conventional centre-hinged ailerons (I'm excluding balanced ailerons and Frise ailerons for the moment) you necessarily get adverse yaw.

I have been assured that this is simply the consequence of drag being proportional to lift. The lowered aileron results in more lift and, hence, more drag while the raised aileron reduces lift and drag.

Is this a correct and complete explanation?

[Top-hinged ailerons]

BEB, that's a very simple and elegant geometrical explanation - thank you.