Sopwith Pup (oz14522)

 

Sopwith Pup (oz14522) by Bill Bowne 1999 - plan thumbnail

About this Plan

Sopwith Pup. Radio control scale model WWI biplane, for electric power with geared Speed 400 motor. Wingspan 31-1/3 in, wing area 360 sq in.

Direct submission to Outerzone.

Quote: "As I write this, it’s been over 24 years since I drew up and built this Sopwith Pup model. I’d rather tell you what I definitely remember about it and not try to stretch the facts. I will say it was a very pretty model in the air, stable and easy to fly (once I increased the dihedral), and an absolute sweetie on a grass runway.

I built the Pup to use a Speed 400 with an Olympic gearbox. Thanks to the gearbox’s distinctly oval pinion gear, the gearbox made a rhythmic rumbling sound, especially at low throttle, giving a very realistic sound when making low passes and approaches (Yes, I have heard real WWI type radial engines, as I lived less than a two-hour drive from Old Rhinebeck Aerodrome).

The model is classic stick construction, and it really looked good with Litespan covering. Originally, I planned to use Cmdr Dunning’s colors, from his historic (but, sadly, ill-fated) landing aboard HMS Furious. To save weight (remember, this was a Speed 400 and NiCAD model!), I didn’t do any painting, nor did I use fabric dye on the Litespan.

I used white Litespan for the white parts of the roundels and for the rudder. I cut the blue and red markings from craft-store tissue paper. Dope the tissue to the Litespan with dope thinned 50/50, spray it with rubbing alcohol to shrink it, then finish with a coat of un-thinned clear dope.

I maidened the Pup without ailerons, and, as I soon discovered, without enough dihedral for the rudder to turn the model effectively. I wound up having to do several loops before I was able to keep the model from flying into a tree... happily, full up and full rudder was enough to drift the model away from that tree! So, if you don’t add ailerons, DO keep the dihedral at least as per the plans.

I did mold the engine cowling from a pop bottle, using a balsa plug and a heat gun. In fact, I molded a cowling, then shrank a second cowling over that to ensure the cowling was strong enough to survive grass field landings.

Finally, if you can’t find realistic wheels AND you’re flying off grass, you can do what I did – laminate balsa over light ply discs, chuck the sandwich into a drill and sand in a shallow center cone and the dummy tires. I don’t recommend wheels made this way for pavement, but they work fine on grass and only need the occasional black paint touchup."

Supplementary file notes

Build notes.

CAD file

This plan is available for download in CAD format.

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

Sopwith Pup (oz14522) by Bill Bowne 1999 - model pic

Datafile:
  • (oz14522)
    Sopwith Pup
    by Bill Bowne
    July 1999 
    31in span
    Scale Electric R/C Biplane Military Fighter
    clean :)
    all formers complete :)
  • Submitted: 17/04/2023
    Filesize: 1154KB
    Format: • PDFvector • CADfile
    Credit*: BillBowne
    Downloads: 758

ScaleType:
  • Sopwith_Pup | help
    see Wikipedia | search Outerzone
    ------------
    Test link:
    search RCLibrary 3views (opens in new window)


    ScaleType: This (oz14522) 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/Sopwith_Pup
    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.

Sopwith Pup (oz14522) by Bill Bowne 1999 - 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):
  • Sopwith Pup (oz14522)
  • Plan File Filesize: 1154KB Filename: Sopwith_Pup_oz14522.pdf
  • Supplement Filesize: 20KB Filename: Sopwith_Pup_oz14522_build_notes.pdf
  • CAD Zip Filesize: 163KB Filename: Sopwith_Pup_oz14522_cad.zip
  • help with downloads
 

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, 2011-2024.

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.