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-   -   CY MODELS La-7//Evolution 160 radial (https://www.rcuniverse.com/forum/rc-warbirds-warplanes-200/11640003-cy-models-la-7-evolution-160-radial.html)

n8622t 08-02-2017 09:01 AM

I believe that the La7 used a cooling radiator which was located on the belly inside an air scoop. I'll have to read my book again to see if that's correct

moparbob498 08-02-2017 03:53 PM

That's coming along beautifully, & looks like you did take a bit more off when opening up the cowl? Look as though you did? Looks great , I'm liking this. Thank you for sharing

n8622t 08-02-2017 04:16 PM


Originally Posted by moparbob498 (Post 12357003)
That's coming along beautifully, & looks like you did take a bit more off when opening up the cowl? Look as though you did? Looks great , I'm liking this. Thank you for sharing

Thanks for that moparbob....didn't get to work on it today with other craziness to deal with but I'll be on it again tomorrow

n8622t 08-03-2017 10:56 AM

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Ok I didn't like the clearance on the rockers of two cylinders inside the cowl so I plugged the bolts hole and started over using a different method

n8622t 08-03-2017 10:58 AM

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Originally Posted by warbird04 (Post 12356805)
Take special care to the hot exhaust cooling air! It is a big problem with the La-7, there are nothing to make escape hot air from the coling... and the 2 openig for the side exhaust are not enought...
Can anybody explain how the full size La-7 motor cooling work?

here it is warbird....cut two large areas from the bottom of the cowl and add the two louvre vents

n8622t 08-03-2017 12:14 PM

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Making some guns....they may be a little bigger than scale but they will make a bigger bang!!! Any of you guys know what the barrel is supposed to look like I would appreciate a pic. Surely they're not smooth on the outer barrel?

n8622t 08-03-2017 12:43 PM

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Do some cockpit work....start with the hard part, cutting the canopy

n8622t 08-03-2017 12:47 PM

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Looks like gun blisters have to be placed out of scale location....bummer!!

n8622t 08-03-2017 01:38 PM

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Good enough for government work...

n8622t 08-03-2017 03:50 PM

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Have to do something about that nasty gap!!!

n8622t 08-04-2017 06:49 AM

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I'll install these after the plane has been painted

n8622t 08-04-2017 10:23 AM

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Ready to glue these in

n8622t 08-04-2017 10:26 AM

Now on to the gun blisters

warbird04 08-04-2017 11:26 AM

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So, I am back from holidays. I post you some pictures about the canopy. For the sliding canopy, I make an aperture that is 250 mm long, and 3.5mm height. I make 2 sliders with plywood at 130mm long, that has an "T" form, with 5mm and 3mm height, the tickness is 4mm.
These sliders are going into the aperture from the Inside, and I fix the canopy with some small screw. It works fine and its simple to make. The canopy is closed with 2 magnets.
You see also my solution about the complete hatch fixture, I make 2 brass tubes with an piston Inside, that hold the hatch in position, and for opening I move the both stem in forward position. In the front, I have the originals bolds, that works fine.

warbird04 08-04-2017 11:43 AM

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For the cooling, you see my openning into the firewall. I make an big bore into the below of the fuselage, where the belly scoop is situated. The hot air can exit into the fuselage, and through the side exhaust openning, and around the opening for the Keleos exhaust.
Take care that the up hot air can escape. In your case, the up hot air cannot escape, it forms an hot poached in the up part of the cowling. Do not forget that radials motor give of hot air around the complet cowling... This is my opinion, and experience about radials and cooling
But you make an good job, be continued...

warbird04 08-04-2017 12:03 PM


Originally Posted by n8622t (Post 12356916)
I believe that the La7 used a cooling radiator which was located on the belly inside an air scoop. I'll have to read my book again to see if that's correct

In the squadron signal LA 5/7 fighters, there is indicated that the Shvetsov ASh-82FN motor is air cooled...
What about a cooling radiator on the belly side for an air cooled radial ? Weird it is...

n8622t 08-04-2017 02:33 PM


Originally Posted by warbird04 (Post 12357512)
In the squadron signal LA 5/7 fighters, there is indicated that the Shvetsov ASh-82FN motor is air cooled...
What about a cooling radiator on the belly side for an air cooled radial ? Weird it is...

it's an oil cooler

n8622t 08-04-2017 04:07 PM


Originally Posted by warbird04 (Post 12357503)
So, I am back from holidays. I post you some pictures about the canopy. For the sliding canopy, I make an aperture that is 250 mm long, and 3.5mm height. I make 2 sliders with plywood at 130mm long, that has an "T" form, with 5mm and 3mm height, the tickness is 4mm.
These sliders are going into the aperture from the Inside, and I fix the canopy with some small screw. It works fine and its simple to make. The canopy is closed with 2 magnets.
You see also my solution about the complete hatch fixture, I make 2 brass tubes with an piston Inside, that hold the hatch in position, and for opening I move the both stem in forward position. In the front, I have the originals bolds, that works fine.

So tell me warbird is that the original canopy that came with the kit? That's a really nice mod you did and adds a lot to the plane.
Thanks for sharing. I'll have to add this to my build. Keep posting man it's looking awesome!!

warbird04 08-04-2017 11:07 PM

Yes it is the original canopy. Cut away the originals mounting brakets, cut away the rear wood plate, make some finish job, and the job is ok. The two brass tube are 305mm long and 4x3mm diameter. The front bolds are the originals.
For best result, I have cut away the above former in the fuselage and on the canopy, and make a new on both, but 65mm backwards. This allow more space for pilot rooms, you can repositioning the pilot as the original size...
I make the pilot room and cockpit later, I want to finish the LA and test first flights befor I spend a lot time into cockpit work.

warbird04 08-04-2017 11:22 PM


Originally Posted by n8622t (Post 12357546)
it's an oil cooler

Ok, but where is going the hot air from the air cooled cylinders? Where is the escape?
I have see this point from the begining, and it is a big problem if you do not want to cut the full cowling with ugly openig.
The American radial Warbirds have all an space between motor cowling and fuselage, and this allow good cooling for us modelers. But the Russian make this différant, and for the models that is an critical point.
In all, I Wonder how the full LA works with cylinder cooling.... I trie to search more infos about this, it is an interesting point to clarify.

n8622t 08-05-2017 02:35 AM


Originally Posted by warbird04 (Post 12357625)
Ok, but where is going the hot air from the air cooled cylinders? Where is the escape?
I have see this point from the begining, and it is a big problem if you do not want to cut the full cowling with ugly openig.
The American radial Warbirds have all an space between motor cowling and fuselage, and this allow good cooling for us modelers. But the Russian make this différant, and for the models that is an critical point.
In all, I Wonder how the full LA works with cylinder cooling.... I trie to search more infos about this, it is an interesting point to clarify.

ok warbird, go back up to post #80 on this page and you will see the pics I posted of the two Louvre vents that will cover the large openings that will be cut into the bottom of the cowl....I think that with those two openings plus the two side vents, it should be enough to keep air moving across the cylinders.

n8622t 08-05-2017 02:44 AM

I started looking at the work you have done on your canopy...that is an awesome job!! I had not planned on doing a functional canopy but yours looks so nice I believe that I will use your method and do the extra work. Thanks for sharing that with me. I agree with you on the cooling thing with the La7. Everything I have read about the full scale claimed that the cockpit was extremely hot for the pilot that flew it, even in extremely cold temperatures. The oil cooler helped keep the engine cooled down but like you, I think the cowl kept a lot of the heat in and probably was the cause of the overheated cockpit. Those poor guys!!

n8622t 08-05-2017 03:05 AM


Originally Posted by warbird04 (Post 12357503)
So, I am back from holidays. I post you some pictures about the canopy. For the sliding canopy, I make an aperture that is 250 mm long, and 3.5mm height. I make 2 sliders with plywood at 130mm long, that has an "T" form, with 5mm and 3mm height, the tickness is 4mm.
These sliders are going into the aperture from the Inside, and I fix the canopy with some small screw. It works fine and its simple to make. The canopy is closed with 2 magnets.
You see also my solution about the complete hatch fixture, I make 2 brass tubes with an piston Inside, that hold the hatch in position, and for opening I move the both stem in forward position. In the front, I have the originals bolds, that works fine.

Your solution for the hatch hold down with brass tubes is a super idea...I will use your set up on this as well, very nice!!!! That motor mount you made is awesome as well. A friend of mine just retro fitted his Saito 90 radial with a Walbro carb purchased from Morris Mini Motors. I included the link for you to look at. The link is for the 84cc radial and you have the 90cc, that means you only need the carburetor and not the adapter plate so it will be much cheaper for you. The Walbro has a choke which is a great advantage to have with any engine

n8622t 08-05-2017 03:06 AM

https://www.morrisminimotors.com/gas...rsion-kit.html

n8622t 08-05-2017 07:41 AM

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  • Check this out warbird .....


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