Andy Stephenson

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Could it be that the ailerons were plugged crossed and the effect was only noticed on finals?

You don't say what size they are or if they are connected in series or parallel. Your best bet is to get a 3s LiPo say 2200 mAh, this is what I use to power a 12V geared starter it has enough power to turn over large 4-stroke engines and it only needs charging a couple of times in a season.

This is what I use... https://deluxematerials.co.uk/collections/emulsion-adhesives/products/cover-grip

A wooden lining might be effective in jamming a metal cutting blade.

Can you, for instance, change the aileron differential using the rudder trim lever on a 16SZ. This is one of the many features it's possible to set up on open source radios or at least ones that came out of that thinking.

I recently had an upgrade done to my glass slope soarer, with flaps added to make it much easier to land on difficult slopes. I was told that my Futaba 14SG was almost impossible to program to any satisfactory level to take advantage of all the conditions needed to fully utilise it. I was well advised to go for an FRSky X14 setup. This is because there are already pre-baked complex mixes (85 of them) ready to be installed exactly for this application. A well respected guy in this field called Mike Shellim has done all the work necessary to make this setup easy.

The government were thinking of cutting down the legal level, if I remember correctly, to 17% there was a response document posted some time ago about this so I sent in my objection.

Yes they're from an Austrian company called Kolm but you really, really, won't like the price. https://www.kolmengines.com/?lang=en

Only shipping as I said earlier.

At the current exchange rate OS F plugs are £5.78 from RC Japan. As we have a free trade relationship with them, all you pay on top if you order from them is shipping which works out to not a lot if you buy a few at a time. https://www.rcjapan.net/index.php?main_page=index&cPath=80_115&zenid=09o04gm5flurpb37le76e19jn4 I should also add, if you are concerned they aren't kosher, you can buy a certificate of origin for around another fiver.

This is the technique I use for making Panic wings, I apply 1000 grade lining paper directly onto foam cores using PVA. The paper is absorbent so I don't thin the PVA but I do wet the paper to make it compliant as it's too thick and stiff otherwise. I wrap it around the leading edge and peg it at the trailing edge to keep it tight while it dries. It shows some of the foam grain through as it shrinks but as long as you aren't too fussy it works just fine.

I'm sure the OS91FX engine I once owned was ABN construction so I don't think they are necessarily all ringed.

There are bogus OS glow plugs out there but I haven't come across F plugs being copied. If indeed you have fake plugs they will probably be laser etched with the type rather than stamped like the genuine article. Alternatively, it could be there is some manufacturing debris remaining in the engine which is destroying plugs. This is not an unknown phenomenon in a new engine. It may be worth stripping it down to investigate.

Looking at the external state of that engine and the use it may have had, it's likely that the liner has had it plating stripped, this is a regular occurrence with OS 2stroke engines of this vintage. A friend recently bought a second hand OS 61FX to discover the liner was in a shocking state and replacements are either very hard to find or far more money than he paid for it. I personally have had this issue with OS engines on a number of occasions. It's worth checking out what spares are available before buying.