DONE +++ Project "Bombus": a PantherG tribute build (Zlin Z-37A; OK-BOM)

[KiwiZac]

That is so, so cool! What a fantastic model and a great tribute to a forum stalwart.

[Dizzyfugu]

Thank you! 

[loupgarou]

Fantastic job! Crazy painting work. I would  never been able to paint all the decoration in a proper way. 
As I am a lazy bum, I'd have printed decals directly from the drawings. 

[kitbasher]

 

[The Rat]

Cute little devil!

Finally... And it's cute! 


1:72 Zlin Z-37A "Čmelák (Bumblebee)"; aircraft "OK-BOM", operated by Slov-Air; Bratislava Airport (Czechoslovakia), 1988 (Whif/Eduard kit) by Dizzyfugu, on Flickr

I hope he's merely pulling oil into the cylinders and not trying to flip-start it!  He's also pulling it in reverse. 

[Wardukw]

I have seen dudes turn an engine backwards a couple of times and then turn it the right way before..the reason...no idea at all 
Could be either to loosen the motor up before starting if its been sitting to long..i have done it with car engines so this might be the case...or Dizzy made a bo bo 

[PR19_Kit]

They do that to pre-lubricate the cylinder bores, or that's what a friend at Shuttleworth told me. Apparently it's done much more commonly with radials than win in-lines, but I've no idea why.

[Wardukw]

Oh that makes sense..a radial being round is more likely to have oil settle in the bottom cylinders and drain from the top..inlines or V configured engines have channels built into the heads to hold oil in the heads to lubricate the valves and springs and im pretty sure there is no oil sump on a radial engine if there is then its a tank with a oil pump feeding the engine by pipes or hard lines .
Or something like that 

[Old Wombat]

The old WW1 radials & rotaries had sufficiently low pressure that they could be turned by hand to move the pistons to drain the lower cylinders of pooled oil & fuel, & to lubricate the cylinders prior to start up.

As radials got bigger & more powerful this became the job of the starter motor, which was activated for a few revolutions before the magnetos were turned on.

This was still the procedure on S-2E/G Trackers when I served in the 1980's to prevent hydrolock.

[NARSES2]

As I am a lazy bum, I'd have printed decals directly from the drawings. 

I'd have persuaded someone to do the "decals" for me 

[Dizzyfugu]

As I am a lazy bum, I'd have printed decals directly from the drawings. 

Thank you. Decals were actually an option, but there were certain drawbacks. First, I cannot print in white and the potential white decal film that I could have used lacks opacity. Tghis would have looked quite ugly, and matching a transparent film with the black vein structure over a painted white base would have been messy, with no visible benefit over a fully painted solution. Another problem: the Z-37's wing surfaces are ribbed, and placing decals onto this surface, esp. when these are delicate home-printed stuff, would be an invitation to desaster. Again, painting would be - despite problems in itself - the "safer" solution. And it did not turn out bad at all, the (small) investment into a black enamel paint pen paid out. 

[The Rat]

I have seen dudes turn an engine backwards a couple of times and then turn it the right way before..the reason...no idea at all 
Could be either to loosen the motor up before starting if its been sitting to long..i have done it with car engines so this might be the case...or Dizzy made a bo bo 

When I was a ramp rat we were instructed to not turn the motor backward, apparently it can kick back, and possibly severely damage one's fingers. Might have been a myth just to scare us.

[The Rat]

They do that to pre-lubricate the cylinder bores, or that's what a friend at Shuttleworth told me. Apparently it's done much more commonly with radials than win in-lines, but I've no idea why.

Yes, more common with radials because the oil can drain from the top and settle in the bottom. Sometimes done with horizontally opposed engines, especially in cold weather and prior to hand-flipping the prop. Done that a number of times.

[Wardukw]

Rat man that is a myth ..some of the engines ive rebuilt have been locked up  dew to sitting..you can it when it is still in a car because the motor wont run until you tell it too..ive done it dozens of times..never had a problem.
Did have a mate who welded his watch to his wrist when he tried to remove a lead from a battery and arced it with the spanner he used..i never wear a watch when working on cars ..not for that reason..just keeps getting in the way.

[zenrat]

My wedding ring has a crater melted in it which is the result of putting a screwdriver into a light fitting.
I still wear it when working on stuff but now I turn the power off at the mains and not just at the light switch.