SE5a (oz1527)


SE5a (oz1527) from Keil Kraft 1975 - plan thumbnail

About this Plan

SE5a. Radio control scale model of the WWI biplane fighter. Keil Kraft SE5A at 39-1/2 in wingspan, for .10-.15 engines and 3 channel R/C.

Quote: "Flown by Aces such as Ball, Mannock and McCudden, the SE 5A has carved itself a place in history as one of the finest fighting aircraft of World War I. The men and machines of the period were quite unique and represented a style of warfare that was completely different to anything else before or since. There is much value in preserving information on this subject and we hope that your model will enable you to recapture the excitement of the age of fighting biplanes.

Before you start building, read all the instructions carefully and study the plan to identify the parts of the model.

Commence with the fuselage construction:

1. Lay the two fuselage sides on the plan as shown in 'Step 1' and glue the front and rear ply doublers in place. Use an impact adhesive for this operation making sure that one right hand and one left hand side is built.

2. Carefully trasfer the positions for the spacers and formers from the plan and mark these on to the inside of the fuselage sides.

3. Trim the 3/8 square hardwood engine bearers to length and glue to ply doublers as shown in 'Step 1' on the plan. Use formers F3 and F5 to obtain correct position..."

Direct submission to Outerzone.

Quote (from review): "There is plenty of room for up to three-channel equipment, and if the 4 oz tank supplied is used, I would certainly recommend having throttle control - but not at the expense of elevator. Routing of the push-rods is not shown but proved to be simple. Sufficient hardware is included for 3-channel operation, and the devises, horns and so on are ideal for the job.

My equipment slotted in, with three servos abreast, and the receiver behind the tank. A 225 nicad was taped to a ply plate and, in an effort to keep the CG well forward, the latter was screwed to wood blocks under the tank. In order to avoid having to remove the lower wing for battery charging, a remote charging socket is to be recommended.

The final all-up weight (with 4 oz noseweight and empty tank) came to 54 oz. This produced the relatively low wing loading of 14 oz/sq ft, so no problems were anticipated with flyability. The need for that lead in the nose was probably due to my extra coat of sealer, and since the instructions say that the elevator control is quite sensitive, it will pay to make sure that the CG on your model is no further back than shown!

Flying: My OS.15 had been installed with its silencer outlet joined by silicone tubing to a scale-length exhaust-pipe of 3/8 in dia aluminium tube, so a power loss was to be expected. The hardest part of pre-flight preparation was in selecting the propeller. There was no specific guidance in the instructions, except to select an experienced assistant. Well, I'm pretty experienced, but was still uncertain! I therefore tried three sizes, experimenting in the back garden: 8 x 6 nylon, 9 x 4 nylon and 10 x 3-1/2 TopFlite wood. The 10 in prop gave the best static thrust, and the 9 x 4 next best. The 8 x 6 was poor on the deck, but I felt could possibly be better in flight. I selected the 9 x 4, due to its better crash-resistance, for the first takeoff - and took off for the flying field.

This was the first SE5a to be seen in our area, so its arrival did not go unnoticed, and tanking up and starting was a warm operation because I was surrounded by on-lookers! There was very little wind and, on the first takeoff attempt, air-speed was not attained due to the drag on our grassy strip. Off with the 9 x 4 and on with the to 10 x 3-1/2. This time the acceleration was better but she still didn't quite make it before reaching the longer grass at the edge of the strip. Ah well, nothing left now but to give 'er a chuck. A willing helper was found who, with a gigantic heave, catapulted the SE into her element. Poetry in motion, it was - and the model looked good, as well!

No trim adjustments were necessary, the SE climbing steadily away with a nice air of realism. I experimented with the rudder control - it was quite a change to get back to rudder/elevator - and she handled like a well-bred trainer. Response to controls was smooth and pleasant; I had kept the throws fairly limited as recommended in the instructions. (In the absence of specific details, I used the outermost hole on the elevator horn, and ad-justed the rudder throw for lin. each side of centre).

After these intial experiments, I flew the model around, savouring the authentic vintage atmosphere it exuded. After about ten minutes (the 4 oz tank is good for twenty!) looped her, using a dive to build up speed. Next came a stall turn - ragged, but then, I wasn't used to her. Next a barrel roll - and phut! - the motor conked, so I glided her in. By keeping the nose down, I was able to maintain the good control response on the glide, and the landing would have been all right but for that long grass, which tipped her up.

For the next flight I disconnected the long exhaust pipe, but kept the 10 x 3-1/2 prop in place. She'd been so stable, right from the first launch that I did the honours myself this time, gripping the tranny in my left hand - smooth as silk again. The all-sheet fuselage gives confidence, and single-handed flying in rough pasture should be easily accomplished.

This second flight was every bit as enjoyable as the first, though removing the exhaust extension only improved power slightly. This time, spins were attempted - unsuccessfully - and the engine cut again during another barrel roll (perhaps a touch of pressure would help here). The landing was a picture - she trundled along for ten yards, once again up-ending on reaching the longer grass.

Summary: The KK SE5a is a lovely little plane and will rightfully become very popular. It is certainly not over-powered with the .15 and, I should think, would be on the marginal side with a .10 - and probably pleasantly lively with a 19. Further flights have verified her viceless nature and, provided one has passed the basic trainer stage, Keil's SE5a will give you many hours of pleasing, nostalgic, entertaining flying."

Update 07/05/2018: added kit review (by Gordon Whitehead) from Radio Modeller, May 1976, thanks to RFJ.

Update 19/07/2019: Replaced this plan with a clearer copy, thanks to Pilgrim.

Direct submission to Outerzone.

Supplementary file notes

Kit review.
Previous scan version.


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

SE5a (oz1527) from Keil Kraft 1975 - model pic


  • Royal_Aircraft_Factory_S.E.5 | help
    see Wikipedia | search Outerzone

    ScaleType: This (oz1527) 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.

    ScaleType is formed from the last part of the Wikipedia page address, which here is
    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.

SE5a (oz1527) from Keil Kraft 1975 - pic 003.jpg
SE5a (oz1527) from Keil Kraft 1975 - pic 004.jpg
SE5a (oz1527) from Keil Kraft 1975 - pic 005.jpg
SE5a (oz1527) from Keil Kraft 1975 - pic 006.jpg
SE5a (oz1527) from Keil Kraft 1975 - pic 007.jpg
SE5a (oz1527) from Keil Kraft 1975 - pic 008.jpg

Do you have a photo you'd like to submit for this page? Then email

User comments

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



Download File(s):


* 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.


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, 2011-2019.

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.