Shavrov SH-2 (oz13809)

 

Shavrov SH-2 (oz13809) by Ken Sheppard from Radio Modeller 1997 - plan thumbnail

About this Plan

Shavrov SH-2. Radio control scale model amphibian, for .20 to .25 engines.

Quote: "A 60 in span scale model of a 1930's Russian Shavrov Sh-2 lightweight amphibian for .20 - .25 power.

Designed by the Russian engineer VB Shavrov, the Sh-2 was originally built as an amphibian flying-boat for sports flying, training and light transport, suitable for use in areas of the Soviet Union where few or no aerodromes existed. Derived from the Sh-1, the Sh-2 was larger at 13 metres span and was fitted with a more powerful 100hp engine.

Over the 30 years from its first flight in 1930, the type has been used as sports, liaison, passenger and mail transport, ambulance and agricultural duties, forest protection, ice reconnaissance, civil & military training, rescue and even as a glider tug. A truly utilitarian and functional vehicle. Yet for all of that, the Shavrov Sh-2 is extremely attractive, with graceful, flowing curves and clean, uncluttered lines - which is what attracted me to her in the first place.

Why I chose the Shavrov: I wanted to build a flying-boat for my next project. Not having any lakes in the immediate vicinity of my home base, an amphibian seemed to me to be the ideal compromise. The Sh-2 has been lurking in my build list for some time, having discovered it in a Putnam book, whilst browsing in my local library last year.

The sharp, yet curvaceous lines of the hull/fuselage are particularly nice - she just cried out for modelling. What made me put pencil to paper finally, was seeing a couple of photo's of Barry Burton's 8ft span version in a back issue of Radio Modeller. What a cracker!

As regards the size, I am a small to medium size model man - and having a spare .25 OS SF on the shelf - Bob's your Uncle! (or should that be Vladimir's your Uncleski!)

Design Criteria: Having collected numerous off-cuts of blue foam from previous projects, all of which seemed too small for practical use, it occurred to me that I could use them in the hull construction, sandwiching ply frames carrying the wing mount wires and tail skid assembly, between hollowed blocks and skinning the resulting lightweight structure with thin balsa sheet.

For water protection, should I ever get the chance to fly off of water, the hull is finished in light glasscloth and resin, all adhesives used being waterproof, namely epoxy.

The reasonable amount of scale dihedral - and sweepback meant that 3 channel was feasible, simpler and cheaper. The prototype was built and flown in this configuration but was subsequently modified with the addition of ailerons, operated by mini servos in each panel, a 'Y' lead in the centre section - the lead running down the cabane wire into the hull.

The wing structure, being traditional built-up structure, with two solid sheet spars and nose D-box for torsional strength, plugs into the centre section via ply tongues and boxes, giving location only, the flying loads being taken by four spruce struts, picking up on brass lugs epoxied through the fuselage skin, up against the main load bearing ply frames. Rubber bands, around wire hooks, retain the wing panels to the centre section.

For scale accuracy and atmosphere, closed loop wires to elevators and rudder are absolutely essential. I fitted bellcrank pivots on the same centre, operated by wire rods connected to two standard servos, mounted just forward and aft of the front cabane wire. This gives reasonable access to the electric's and adjustment of the closed loops - but not a lot! A little bit of manual dexterity required.

The true shape of the cockpit is questionable, I can't be too sure from the photos. The Sh-2 was able to carry a complement of three, two in front and one behind, with high sides to the cockpit. I have tried to work out a logical profile transition but if you think that it should be different - feel free! - the beauty of working from vague photographs is that no-one can prove you wrong (?).

The engine pod/tank fairing is not scale either. However, it is, I think, in keeping with the lines of the overall aircraft. So there we are, an unusual sports scale configuration.

Building Notes There aren't a lot - the sequence of build that seems most logical, is fuselage, centre section, tail end, wing panels, struts and finally winglets/floats. The latter I chose to shape from blue foam, with hard balsa spars. The winglets locate on ply sub spars through the fuselage retained by a self tapper screw.

Check carefully the incidence angles of the wing/tail datums, when building the centre section, and that the centre section is square to the fuselage datum, in the plan view. Use a straight edge or a strip of hardwood clamped to the trailing edge of the centre section to align the tail plane and fin..."

Direct submission to Outerzone.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

Shavrov SH-2 (oz13809) by Ken Sheppard from Radio Modeller 1997 - model pic

Datafile:
  • (oz13809)
    Shavrov SH-2
    by Ken Sheppard
    from Radio Modeller
    February 1997 
    60in span
    Scale IC R/C Parasol Floatplane
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 24/03/2022
    Filesize: 793KB
    Format: • PDFbitmap
    Credit*: KevinBranch

ScaleType:
  • Shavrov_Sh-2 | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz13809) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.


    Notes:
    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Shavrov_Sh-2
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Shavrov SH-2 (oz13809) by Ken Sheppard from Radio Modeller 1997 - pic 003.jpg
003.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
 

Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

Terms of Use

© Outerzone, 2011-2022.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.