Recent content by andrewh

A De Havilland with two engines conjures up a list of desirable planes, but being used recently into a mountain location makes it almost certainly a DHC Dash-8. ( now made by and badged as Bombardier engines are as described below ( from Bonbardier website) <<Q400 engine and performance The...

Found another ( professionally made) video My pelican flies from 4.25 Andrew

That’s never stopped me! that was my first flight- my dead flying buddy , Wes, didn’t trim the pelican - he used an elevator to make up for “ creative” motor thrust lines. So it took me a few circuits to find the ideal speed/ turn trim. Also the configuration is a Platz planform, and very...

Found a video! This is a pelican ( not sure of the species) made by a flying buddy who died during Covid. This is my first flight with it, so the first couple of circuits are a bit upsy wupsy and downsy wownsy till I get him under control. Differential steering with two motors and an elevator...

OK, I need to get back up to speed, and learn how to insert quotes. It seems obvious but hasn’t happened (yet) Thanks for the welcome messages. I used the be slightly active when I lived in Britain, but have been quiet since I moved to Australia ten years ago GreenTwin. No machining...

After a ten year gap and lurking: Viola! Here I am again Retired engineer with a gas turbine/machine tool/assorted background, I have been following the model diesel threads with interest, and revelling in the creations of Brian Rupnow I have found my old login and may throw in my...

Most of the “glass” tanks associated with model engine carburettors are plastics of appropriate type to resist the fuel used in the particular engine. i seem to remember someone ( Brian Winch?) suggesting using the end of a polycarbonate test tube for the tank. Not many model engines use...

Hi, can I call you pat_? The Venturi size from the drawing should be, I think 5.5mm dia, and the spraybar diameter 4.76. So that explains the tiny air passage we see in your photo. The fuel hole should be #61 drill, which I make 0.039 or 0.99 mm ( I don’t know where you are in the world, so I...

Fundamentally I am wondering whether converting the Chris Boll plans (BollAero 1.8 Gallery) from Imperial to Metric using the 'that's close enough' approach (particularly on drill sizes and fasteners) is the root of all my ills. You can be fairly certain that this is no part of any problem. -...

I’m not fully up to date with current (sorry) small Hondas but when I knew them they used a similar looking coil driven by an LT flywheel magneto, so the applied voltage was probably 2 to 20 volts approx. I have used the C50 coil for many applications, 6, 12 V and several random flywheel mags (...

Hi, Rodrigo Well done! This must be classed as a triumph! I an a diesel freak enthusiast for more than 60 years, and your video is so real that I wish I could lean in to help! As Tim Westcott says, you have the compression almost exactly right, but need to open the needle valve a little till...

Its been a long while since I wrestled with gears, but 16T isn't a small number of teeth! Its the tiny sprocket gears, 12T or less that require modification so that that the "leaving and entering" teeth have enough room to do that P'raps your delrin gear is made to module standards? andrew

From the photo it looks to me very like a zinc plated and passivated (ZPP) coating on a more-or-less mild steel. reasons for thinking this: The range of colours are what ZPP fades to after a few years, there also seems to be a slight white dusting, which would be zinc oxide. ZPP is a minimum...

I am working from memory, but I remember reading in the 1960s that the largest reciprocating IC engine was in south Australia, used for pumping water. The "Piston" was the column of water and was, from memory about 20 feet diameter I couldn't find the article again, it must have been in...

Of no use, but possibly of interest, is the fact that ungula is Latin for a nail (as in fingernail) Hence the horse family are the Monugulates since they run around on one fingernail. Every day, if we're not careful we learn a new thing andrew