B-25 Mitchell (oz3835)

 

B-25 Mitchell (oz3835) from Royal Marutaka 1976 - plan thumbnail

About this Plan

North American B-25 Mitchell. Billy Mitchell.Wingspan 75 in, wing area 750 sq in.

Scale is 1-1/8in = 1 ft.

From Royal (Marutaka) this is a large twin project for 40-60 glow engines. Scale WWII American medium bomber.

Update 17/04/2020: Added kit review from RCM June 1979, thanks to RFJ.

Quote: "RCM Product Test: Royal Products North American B-25.

Over the last couple of years, twins have increased considerably in popularity in both sport and scale flying. Perhaps overlooked in the introduction of new twin kits is Royal's B-25 which has been on the scene for a number of years.

Our initial impression of high quality was maintained throughout construction. The kit consists of high quality balsa and plywood. The die-cutting of plywood and pre-shaping of balsa parts is superb. The parts match to plans is also excellent and no engineering problems were encountered in construction.

Much of the worry associated with engine alignment is eliminated by the plywood jig which frames the engine mounts. At the same time this jig serves as a wing dihedral brace and crutch for the engine nacelles. Even so, the major part of construction is the wing and nacelle assembly. Care must be exercised if warps are to be avoided and the wings evenly matched. Construction pleasure would be enhanced if the instruction manual and plans provided much more detail. As presently written - the average builder is likely to face many opportunities to ruin his project unless help is available from an experienced builder.

The B-25 comes complete with aluminum cowls which match the firewall perfectly. For added realism they can be notched to simulate cowl flaps. Pre-formed landing gear is furnished, however, retracts can be fitted with a little extra work. We used Rhom-Airs after reversing the main gear cylinders to provide wheel clearance. Other accessories included were bellcranks, control horns and wing bolts. Although Royal provides an excellent 'green house' for the bombardier, our version was converted to a B-25J with a solid nose. This version was flown by the 345th bomb squadron in the Pacific.

Now about flying - this is a big model but don't overpower it. Two .35's or .40's will provide more than enough power for superb flying. With two K & B .40's on a grass runway expect lift-off in about 100-125 feet. Once in the air and with gear up, you can throttle back to about 2/3 power and enjoy that 'special sound' that only twins provide. Landing is no problem if you just remember one rule: don't try a go-around on one engine. If one should quit, then take what you can get without jamming the throttle forward. That's a pretty good rule for any twin.

All in all, the Royal B-25 appears to be a very reasonably priced model considering the engineering involved in its development and the quality of materials provided. It is an excellent kit for an experienced builder. With more detailed plans and instruction booklet, it would be a good twin project for any good flyer."

Update 22/05/2020: Added kit review from MAN September 1986, thanks to RFJ.

Supplementary file notes

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B-25 Mitchell (oz3835) from Royal Marutaka 1976 - model pic

Datafile:

ScaleType:
  • North_American_B-25_Mitchell | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz3835) 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/North_American_B-25_Mitchell
    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.

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B-25 Mitchell (oz3835) from Royal Marutaka 1976 - pic 008.jpg
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User comments

Added nice image of finished model, thanks to OlafP [more pics 004].
Mary - 15/02/2018
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  • Supplement Filesize: 969KB Filename: B-25_Mitchell_oz3835_review_RCM.pdf
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Scaling

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