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Hello Petertha, Or in other works, ' The geometric errors are so small, they can safely be ignored in a low compression ratio (6:1) and low revving engine (less than 3000 RPM) such as the 18 cylinder Isotta Fraschini model'. Mike

Hi Diego, Jos is quite correct about clearing any drained oil from the lower cylinders. Years ago, I worked on aircraft fitted with Bristol Hercules sleeve valve radials. Every morning we had to 'walk' the engine through eight blades (two complete revolutions) of the prop, before attempting to...

Hi petertha, Yes it's a bit of a pain to add the throttle servo, tx and rx input for bench running, so I used that cheepo blue servo tester instead. Have a look at the DIY multi cylinder glow driver at philsradial.blogspot.com. It uses an Aduino pro mini to control up to nine glow plugs. The...

I manged to charge some life back into my 20 year old, 25Ah Cyclon lead acid cell. I wired up the Expert Multi Cylinder Glow Driver and used a servo tester to switch on/off the current to the five glow plugs (OS Type F). Filled the tank with 10% synthetic oil/ methanol (no nitro!!!!!) and finger...

petertha, That's not a problem. It's good to learn In post #1 I stated my intention; "I'm trying to get my Seidel ST540 five cylinder radial engine back up and running with all the original equipment. It came fitted with an "Expert, Multi Cylinder Glow Driver". Then back post #6, I said...

Most modern glow drivers, flight box starter and even my ancient 'Expert Multi' use Pulse Width Modulation (PWM) control. The full battery voltage is switched rapidly on and off at a controlled rate whch matches the glow plugs requirements. PWM control of glow plug current is far superior to...

As Hamlet said ‘There are more things in heaven and earth, Horatio, / Than are dreamt of in your philosophy.’ A glow plug is heated by the current flowing through it's platinum wire coil. The exact current depends on the applied voltage and the make of the glow plug. The platinum wire coil needs...

petertha Do you know of any 3.7v to 2.0 volt DC DC converters, capable of at least 10 amps?? Also need to consider the intermittent use of a model engine. In a years time, the chosen battery will have reduced in capacity due to storage etc; so you would be advised to start off with a 'larger...

R Thanks again petertha, Yes, I would like to use the original equipment to run the engine. The Expert multi connects a 2.2volt battery to the five glow plugs when the throttle is closed. As the throttle servo is opened above a per-determined level; the glow power is removed and reapplied again...

Surely ONE crankshaft but SIX camshafts Mike

Thanks Thanks for looking. Close, but not quite the same. The Expert Multi is old tech, vintage, like pre-internet. Mike

I'm trying to get my Seidel ST540 five cylinder radial engine back up and running with all the original equipment. I came fitted with an "Expert, Multi Cylinder Glow Driver". Over the years The single page instruction leaflet has become lost. It's a long shot, but does anyone happen to have a...

Beautiful crankshaft and toolpost grinder. Well done. What was the spindle speed of your home made toolpost grinder? What was the diameter, width and grit size of the stone? Mike

I had similar deep undercuts to do on my Bristol Mercury master rods. They were also in steel, so I was able to use a small diamond stone mounted on a high speed spindle. The grinder was rotated, by hand, about the axis of the slave rod pin. You can see the extent of the undercut in the drawing...

deleted, posted by mistake

Complimenti Ferrari, una vittoria meritata

Paulc you have been sent a PM Mike

I'll take that as a NO Mike

This is a long shot. Does anyone know the whereabouts of a set of drawing/ plans for a fourteen cylinder Bristol Hercules radial engine. I have been given a part built engine but not the drawings. It's 1/4 scale and a big impressive engine Mike

Simon, I did not make a list of errors. most are self obvious.The one I liked best was a dimention of 2 9/8" on the crankcase cross section. I redrew the parts with decimal inches instead of fractons which sorted most things out. Mike