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Post  roddie Wed Jan 22, 2020 6:28 pm

Oldenginerod wrote:
roddie wrote:
Regarding the FRV "Hero's".. the subject of this thread; we should prolly be running a "stock/OEM" engine.. using a lower-nitro fuel than we would run in a Cox engine. 10/15% nitro was likely the blend of glow-fuel that these engines were designed to run on.
My first Testors .049 wouldn't start on anything less than the standard (red can) Cox fuel at 25% nitro.  That's what they were built to run on as the original Testors fuel (which I couldn't buy in AU at that time) was 25% nitro as well I believe.

I have a sealed/unopened quart of Testors/McCoy glow-fuel in the black-white can. Gawd only knows if it's still potent.

Testor/McCoy heros - Page 2 My_tes10

Does anyone know what this blend/formula was/is? Hey Rod; maybe it's the 1/2A blend that you needed.. but couldn't source?
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Post  roddie Wed Jan 22, 2020 7:15 pm

rsv1cox wrote:I will have to scout out those two engines again and run them.  

I still think it's amazing that they ran as well with those crushed glow coils as they did before they burned out.  But no one else thought that strange, or at least there was no comment regarding it.  

Bob

I was surprised at the glowhead(s) lighting-off after their showing a loss in continuity.. Huh... I didn't think a glow engine would run if the coil/element in the head was burnt-out (open)... even after disconnecting the DC mains. Glow ignition engines have been known to fire-off/re-start, if drawn thru a stroke when hot.. and no leads connected to the plug.
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Post  Oldenginerod Wed Jan 22, 2020 7:31 pm

roddie wrote:
rsv1cox wrote:I will have to scout out those two engines again and run them.  

I still think it's amazing that they ran as well with those crushed glow coils as they did before they burned out.  But no one else thought that strange, or at least there was no comment regarding it.  

Bob

I was surprised at the glowhead(s) lighting-off after their showing a loss in continuity.. Huh... I didn't think a glow engine would run if the coil/element in the head was burnt-out (open)... even after disconnecting the DC mains. Glow ignition engines have been known to fire-off/re-start, if drawn thru a stroke when hot.. and no leads connected to the plug.
Roddie.  I posted a comment but it seems to have disappeared.  I'll try to recall what it said.

In order to glow once broken, the glow coil would only need to be contacting enough to create a circuit.  Bob gave them a wriggle so they were probably touching enough to complete the circuit and glow.  Once the engine fired, the catalytic reaction would enable the coil to continue to glow even after the coil loses electrical contact.  So, it may run just fine once going, but when it stops the coil is no longer in contact (due to getting bashed around by combustion) and it won't restart.

Regarding your tin of Testors fuel, if it doesn't state it's for 1/2A use, it's probably low nitro for use in Red Heads, Series 21 etc.
Here's a picture Jacob posted ages back.   Specifies 1/2A engines.
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Post  roddie Wed Jan 22, 2020 7:51 pm

rsv1cox wrote:

I still want to build a profile P-38 for them, got all the lumber to do so.

Bob

I'd personally like (really like..) for you to build another 1/2A P38. A profile will build easily.
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