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Author Topic: Polikarpov Po-2  (Read 7887 times)
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Pete Fardell
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« Reply #125 on: October 31, 2013, 08:22:09 PM »

Here's the finished engine (with real one inset for comparison). The gas pipe to the cylinder is mostly disguised in one of the dummy exhaust tubes.
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Sky9pilot
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« Reply #126 on: November 01, 2013, 10:29:37 AM »

SWEET

Tom
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Pete Fardell
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« Reply #127 on: November 01, 2013, 01:04:45 PM »

Thanks Tom, but today I realised that my 5 cylinders were not at the 72 degree intervals they should have been. Don't know why it took me so long to notice this as it is fairly glaring. Thank you if you were just too polite to mention it! Anyway, here it is again, suitably adjusted and then temporaily held in situ. I've not actually fixed the noseblock on yet as it will mean I no longer have easy access to the tank. I know some people would come up with a way to make the block removeable, but my inclination is to just stick it on and cut it off if/when ever I need to. I wonder if Dan or other CO2 nuts have any thoughts on the wisdom of this? I'll at least check that the tank's not leaking before I entomb it.
Next though I'll get on with the rigging while I think about it.
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danmellor
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« Reply #128 on: November 01, 2013, 07:46:33 PM »

Looking good, Pete!

Don't worry about the tank access too much. Check everything for leaks before you build it in permanently and after that, don't worry at all!

Cheers,

Dan.
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DHnut
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« Reply #129 on: November 01, 2013, 11:51:33 PM »

Pete, I confirm what Dan has said about checking for leaks before insatallation and it has worked for me. My Hacker Cub has flown for 8 years without any leaks and other models have been the same. I suggest some small resraint of the tank as a sudden arrival can move things causing some unwanted challenges getting the CG back in place after the tank moves. I like the PO 2 it has a certain utilitarian air about it.  I look forward to seeing videos of the first flight.
     Ricky
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Pete Fardell
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« Reply #130 on: November 11, 2013, 05:42:24 AM »

Rigged! Got a bit carried away with control wires as well.
Nose block now fixed on as the engine seems to run without leaking.
I shall do windscreens and maybe pilots next.
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Yak 52
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« Reply #131 on: November 11, 2013, 07:06:33 AM »

Love it! The control horns/wires look great.

Could your clarify how you did the stars Pete? Is it white decal sheet?
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Pete Fardell
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« Reply #132 on: November 11, 2013, 07:59:36 AM »

Yes, red stars printed on to A4 white decal sheet followed by a coat of Krylon, and then I just eye-balled the white borders when I cut them out.
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OZPAF
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« Reply #133 on: November 11, 2013, 04:32:19 PM »

Stacks of character there - it looks great. The rigging seems perfectly in scale - what did you use?

John
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Pete Fardell
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« Reply #134 on: November 11, 2013, 05:17:53 PM »

Thanks. I use grey shirring elastic, carefully picked out from the tops of my son's old socks. This is thinner than the shirring elastic you buy on a reel, and also thinner than the stuff in adult socks. Also, you can control the thickness further by stretching it more or less.
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Monz
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« Reply #135 on: November 11, 2013, 05:27:31 PM »

That's really gorgeous Pete!
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Graham Banham
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« Reply #136 on: November 11, 2013, 06:40:30 PM »

Nice one Pete: looks great!

Got to have a pilot.

Graham
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Pete Fardell
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« Reply #137 on: November 11, 2013, 07:13:30 PM »

Thank you both. It will have a pilot and a navigator, as I always said it would represent a Night Witches aircraft. I'm not guaranteeing how much they'll look like these two though. There is still plenty of other detail to add; windscreens, little lights, spacer bars, even more rigging on the undercarriage which I forgot. The question is how much to put on before I start trimming? Even foam pilots might effect the CG a bit so I think they will be coming soon. In any case I've never really got the hang of adding detail after the first flights. I like to think it's finished before it flies although I know that's not the sensible way to go about it as bits often get knocked off in the early tests.

(Actually not 'often'...ALWAYS!)
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Graham Banham
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« Reply #138 on: November 12, 2013, 02:44:08 AM »

I'm the same Pete.

All the sensible advice about trimming a new model at an early stage before detail and even before paint if possible goes out the window, largely because if i waited for a suitable venue to come up to do that, each model would take about 2 years!

The only things i would omit on the Po-2 prior to initial test is any more undercarriage detail or rigging as this is the part of any indoor model that gets the most hammering in the early stages unless you're very lucky.
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Pete Fardell
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« Reply #139 on: November 12, 2013, 05:17:21 AM »

I'll take your advice, Graham. There are only a couple of elastic wires to add to the UC anyway. David Deadman designed it so that the forward legs slide up into the fus to give a springy landing, so I'm hoping not too much damage occurs in that department at least. I'll be testing it at the Velodrome on the 23rd. Pictures of the bits will follow shortly afterwards.

Sorry, that should have read, 'videos of the flights will follow....'
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Graham Banham
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« Reply #140 on: November 12, 2013, 03:48:50 PM »

Yes, i had a look at Dave's original model which is very flexible with functional rigging. The forward undercarriage struts do indeed slide into slots in the forward fus, and this works well. If you do a scale prop, bear in mind the reverse rotation of the engine on the full size. Dave's scale prop shows this.
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Pete Fardell
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« Reply #141 on: November 12, 2013, 04:02:32 PM »

Not having Dave Deadman's finesse, I decided early on that his functional rigging and removable wings were just too fiddly for me.  Thanks for the reversed prop tip- I might well have missed that (although I had the same thing with the Farman 190). I won't be worrying about it just yet though; that's something that really can wait till after trimming!
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Pete Fardell
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« Reply #142 on: November 18, 2013, 05:21:21 PM »

I like making pilots usually, but 1/24 scale is pretty small and so I couldn't resist just using the white plastic vac-formed ones I got at the Sam's stall in Nottingham last April. The two halves glue together quite nicely and I know I wouldn't have got anything even vaguely as good by carving.  Sadly they didn't have any lady ones, so I did the best I could with a hint of lipstick and blusher when painting. You'll be pleased to hear that I rejected a plan to augment their chest curves with a heated plug mold. Probably shouldn't have even been considering it.
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Pete Fardell
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« Reply #143 on: November 19, 2013, 09:41:34 AM »

Pilots installed. Also added windscreens and token bit if dashboard detail. That's probably it until after first trimming flights on Saturday.
Few more pics, just in case I wreck it...
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« Reply #144 on: November 20, 2013, 04:33:57 PM »

Looks magic Pete.
John
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« Reply #145 on: November 21, 2013, 04:55:59 AM »

Really nice model Pete - congratulations, and good luck with the trimming.

Mike S
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« Reply #146 on: November 21, 2013, 05:18:37 AM »

That's great work,Pete.

Scott
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Pete Fardell
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« Reply #147 on: November 21, 2013, 11:27:57 AM »

Thanks John and Mike. I'm slightly nervous about the trimming on Saturday. It feels quite heavy (it's about 44g) although a good chunk of the weight is the motor of course. Also, in the Dave Deadman notes he suggests putting the tank at the ideal balance point. I can see the logic of that, but it seemed SO nose heavy that I moved the tank back as far as I could to save adding tail weight. I don't know how much the emptying tank will change the trim mid-flight. Not too much, surely? He also advises trimming over long grass. Not too much of that in the Velodrome, but at least there are no hard walls. Oh well, whatever will be will be.
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« Reply #148 on: November 21, 2013, 05:36:53 PM »

Good luck and proceed slowly.
John
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Pete Fardell
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« Reply #149 on: November 21, 2013, 05:51:31 PM »

Thanks Scott.
John, I'll try and proceed slowly. I'm sure that's good advice. My inclination is to always start from the ground (ie ROG) so as to have less far to fall! On the other hand it's hard to see the flight pattern if it's not in the air. Hopefully I'll have some expert help on hand.
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