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Everything posted by Andy Stephenson
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NiMhs and black wire corrosion
Andy Stephenson replied to leccyflyer's topic in Batteries and Chargers
I'm not sure if it matters whether there is an electrical connection or not since moisture alone may be sufficient to make enough of a circuit to allow the reaction to take place. -
On full-size airliners, winglets reduce vortices by a significant amount. So much so, that it can bring down the time between runway movements where lingering turbulence is no longer a safety risk.
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NiMhs and black wire corrosion
Andy Stephenson replied to leccyflyer's topic in Batteries and Chargers
I would recommend removing batteries from models in storage. If there is no electrical voltage present to drive the electrochemical effect known as black-wire then it can't happen. -
Can someone explain why some items in Aliexpress see unrealistically cheap like an ESC for 40p.
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I've had success removing Solarfilm colour residue from balsa using methanol on a rag and plenty of elbow grease. Methanol won't dissolve foam so it should be OK on EPS. Profilm is quite a different matter, as the colour and adhesive layers are separate. It is possible to remove Profilm without leaving a colour stain.
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Spring is here again - who's been flying?
Andy Stephenson replied to GrumpyGnome's topic in Flying Field Reports and Chat
Maidened my Chilli Breeze this afternoon. With an Irvine 39 on a homemade tuned pipe it literally has unlimited verticals rolling all the way. -
The only times the site appears to be completely clear of this problem is during the main part of the day. Mornings and evenings seem to be the worst, especially at weekends.
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It's happening again this morning.
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It's very patchy, sometimes it's OK others, it's slow or completely offline but it always happens at weekends. It's like someone is steeling bandwidth to download huge files.
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We are now in a predictable pattern of slow access weekend evenings. Is there nothing that can be done about this or is this part and parcel of the service from the host.
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I assumed there was PVA in the DIY filler that produced the rolls when sanding when it sets slightly rubbery.
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A comparison between DIY fillers and model specific fillers would be useful. I have noticed DIY lightweight fillers are often too soft to sand nicely until they have dried over several days, they tend to go into rolls under the sandpaper.
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Slec Sky 40 and Vintage Glider
Andy Stephenson replied to Hoochykins's topic in Power System Selection
The problem is that even major retailers may have fallen into the trap of the counterfeit product. The illustration on the Leeds website clearly shows the wrong type of plug. To be clear, I'm not accusing them of selling fake plugs, it may be the case they just found a library picture on the web and unknowingly put it on the website so check them carefully wherever they come from. -
Slec Sky 40 and Vintage Glider
Andy Stephenson replied to Hoochykins's topic in Power System Selection
Make sure you get a genuine one as there are fake ones about... -
This is a known problem in single conversion receivers. Excerpt from... Understand Electronics (Second Edition), 2001 8.2.2.2.2 Half-IF and image rejection ...The degradation is due to fourth order nonlinearity manifesting itself as second order nonlinearity. More precisely, any interference occurring at Fc±1[/]2FIF will overlap with the desired signal after mixing. In this case, the design trade centered on the filtering strategy, the choice of the IF, and linearity. This is an interesting trade; it entails the classical balancing act between design complexity and performance degradation. Certain knowledge of the level of interference at ½ IF will dictate the design parameters. Recall that the ½ IF problem is nonexistent for direct-conversion receivers since the IF for this architecture is zero...
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This sounds like a problem I had with an ESC. It worked just fine until one day when I was testing it with the prop off, it simply wouldn't run the motor. It made all the right sounds, the 6 beeps to count the number of cells then the go signal but no action after that. I sent it back to the supplier but they repeatedly claimed it never arrived. I lost patience and bought another one from a different supplier.
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I built 3 of these back in the 70s. If I remember, you would want to set the elevator to about 5mm each way low rate and about 8mm high rate. Ailerons would be about the same. Rudder, if you have one, to maximum without fouling the elevator.
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My best guess is that Ecospan could be rebadged Easycote. AFAIK Easycote is a budget film made by Oracover. Both being of German origin, they could be one and the same. https://sussex-model-centre.co.uk/products/10m-easycoat-yellow-35?_pos=6&_sid=43dbbf5ee&_ss=r
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I believe the reason for dual conversion receivers was to prevent something called half IF interference but I can't quite remember the theory behind it. Channels close to 227.5kHz above the lower channels could be interfered due to the phenomenon. When the 35Mhz channels were expanded up to ch 90 there was enough frequency difference to allow this to happen. Although this doesn't add up to an exact number of channels it's close enough to be a potential problem.
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Only APCE props come with spacers, you don't get them with IC props. Providing you can get a prop to centre correctly using a piece of fuel tube or tape as a spacer, if you tighten the nut sufficiently it will stay centred.
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I discovered what's called leveller spray in Halfords. I wasn't sure what it was till I experimented with it. It turns out to be a spray can of thinners specially to level out the orange peel effect from spraying paint. I'm guessing it could be used to remove the blush you get when painting in too humid conditions.
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Good Service!
Andy Stephenson replied to Tosh McCaber's topic in R/C Retailers / Distributors / Manufacturers
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Try RCJapan, OS No8 plugs delivered for £6 each, providing you buy a few. There are lot of cheap copies out there but these are proven genuine.
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That was by way of example.
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I can get No 8 glowplugs for half APOB's price direct from Japan.