Osprey I (oz5402)

 

Osprey I (oz5402) by Dave Ramsey from Model Builder 1974 - plan thumbnail

About this Plan

Osprey I. Radio control scale model flying boat. Wingspan 70in, area 800 sq in. Weight 6 to 8lb. For .40 engines.

Quote: "Osprey I, by Dave Ramsey. Build an R/C scale model of this striking homebuilt flying boat, which one again proves that you don't need brute power to take off from water - just good hull design.

The Osprey I has to be one of the neatest seaplanes I have yet seen. The full size Osprey is a single place, sport flying boat hornebuilt, designed by George Pereira. lt is constructed mostly of wood, covered with fiberglass. The only metal in the construction is the center truss which holds the engine and the wing folding assembly.

The Osprey I is painted white, Hugger Orange (auto paint), and black. The full size aircraft can be built for around $1500 less engine, prop, and a lot of work. So for the time being I will have to content myself with my model. l feel that the model Osprey I is the most impressive flying and looking seaplane I have built, and I Think that anyone building her will feel the same,

The full size Osprey I is built almost like a large model, which makes it very easy to build as a scale proiect. When my Osprey was completed, she weighed 8 lbs, ready to fly. Due to the high thrust line and pusher configuration, the Osprey does not act like an ordinary airplane. With power on, the nose wants to pitch down, and up elevator will have to be held in. This is quite apparent when taking off. When reducing power, the nose will pitch up. With these power changes in action, landing becomes most interesting. After many tries at making a good landing, I have arrived at this procedure: (1) Power reduced to establish a rate of descent. (2) when it is time to level out before the flair, cut back on the power. With the power at idle, the nose will come up and she will sit down just as nice as you could ever want. This does take practice, however, and after 30 or so flights, I am still working on the landings.

The model is stressed for hard flying and will take a beating. Aerobatics are no problem as long a5 you remember she is a scale seaplane.

One thing that puzzles people when they first see my Osprey, is how can it get off the water, at that weight, with only a .40 for power? All I can say is she's got a good hull and 800 sq in of wing area. After all, the wing loading is light and more power for this scale airplane only equals more problems.

FUSELAGE: The sides are cut first and the longer-ons are glued in place, along with the 1/4 inch square balsa strips. The formers are used to align these pieces. When the sides are completed, they are glued to formers F4, F7, and F8. When the fuselage is square and dry, the sides are pulled together and the remaining formers are added..."

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Osprey I (oz5402) by Dave Ramsey from Model Builder 1974 - model pic

Datafile:
  • (oz5402)
    Osprey I
    by Dave Ramsey
    from Model Builder
    March 1974 
    70in span
    Scale IC R/C Floatplane Civil
    all formers complete :)
    got article :)
  • Submitted: 14/03/2014
    Filesize: 572KB
    Format: • PDFbitmap
    Credit*: theshadow

ScaleType:
  • Osprey_Osprey_2 | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz5402) 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/Osprey_Osprey_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.

Osprey I (oz5402) by Dave Ramsey from Model Builder 1974 - pic 003.jpg
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* 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.

 

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