Extra 300 (oz3606)


Extra 300 (oz3606) by Roger Hardie 2012 - plan thumbnail

About this Plan

Extra 300 EP. Radio control scale aerobatic model. Wingspan 40-1/2 in (1030mm), AUW 750g. For brushless outrunner and 3S lipo. Requires 112 W/lb. Recommended motor KM 028310 with 10 x 8 prop.

Quote: "Hi Steve, Please find attached plan of a radio control, electric Extra300. I drew the plan up with reference from an ARF kit... which came with no plan (and I figured well, what happens if I crash... so I drew it up while it is in one piece). The plan is entirely my own work and I am making it available to you free to post on your website where it will also be freely available so I see no issue. I just wanted to send you something so that I can contribute towards your fantastic web site."

Direct submission to Outerzone.

Note it really is not possible to say for sure which ARF model Roger was working from when he drew up this plan in 2012. But if we had to speculate about a close match, one possibililty would be the World Models Extra 300 EP (manufacturer's code: E252B), which coincidentally has a wingspan of 40-1/2 in (1030mm), AUW of 750g, and is for brushless outrunner power with a 3S lipo, recommending the KM 028310 motor, with a 10 inch prop.

Accordingly, we've added a couple of model pics of the World Models Extra 300 EP (manufacturer's code: E252B) here on this page, which may or may not be the exact ARF in question - we couldn't say - but might help you to visualise the style of ARF that Roger might have been thinking of when he drew up this plan.

Update 29/2/2024: Added CAD files (dxf, dwg, lightburn) for the tail parts, thanks to Andy Hill.

Quote: "I have been working on some upgrades for the Plan oz3606. Find attached LightBurn files laser cutting and Autocad plans for Tail Feathers."

Supplementary file notes

Tail parts CAD zipfile.


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Extra 300 (oz3606) by Roger Hardie 2012 - model pic

  • (oz3606)
    Extra 300
    by Roger Hardie
    41in span
    Scale Electric R/C LowWing
    clean :)
    all formers complete :)
  • Submitted: 04/11/2012
    Filesize: 106KB
    Format: • PDFvector
    Credit*: Roger Hardie
    Downloads: 21980

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    ScaleType: This (oz3606) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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Extra 300 (oz3606) by Roger Hardie 2012 - pic 003.jpg
Extra 300 (oz3606) by Roger Hardie 2012 - pic 004.jpg
Extra 300 (oz3606) by Roger Hardie 2012 - pic 005.jpg
Extra 300 (oz3606) by Roger Hardie 2012 - pic 006.jpg
Extra 300 (oz3606) by Roger Hardie 2012 - pic 007.jpg

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

User comments

Hi Hardie, its a great plan however i dont find any marking of wing and stabalizer slots on fuselage. hope you rectify this.
Nadeem - 26/11/2013
I'm sure this plan is complete. The horizontal stab slots into the gap shown (measure the size, it is an exact fit) and the wings are retained with aluminium tubing which slots into the holes (2mm ply reinforced) in the fuselage sides. Looks fine to me.
SteveWMD - 26/11/2013
I built this plane and she flies very well. True the plans are not thorough but if you enjoy designing solutions this will work for you. CG is similar to other Extra 300s.
Anon - 27/07/2016
Hi! Beautiful plan, but i need to know what thickness are the hull ribs (F). Side view shows 3mm and top view shows 2mm.
John - 30/04/2019
Herewith sending photo of my model EXTRA 300 profile model, plan no oz3606 [more pics 004]. Made of Biofoam 8 mm thickness, spars of Assam wood and decorated with vinyl sheet. Electric motor. Does all aerobatics except hovering which I have still not learnt.
DrDineshKittur_India - 05/05/2020
Currently Cutting with Laser Cutter, will upload DXF files/lightburn files in a few weeks and part list I use as I create it.
Andy - 28/12/2023
Find attached couple of build photos [pics 005-007].
Andy Hill - 29/02/2024
There is rudder and other missing parts in the laser cutting file.
Henry - 28/03/2024
I think this is a work in progress from Andy. I expect more parts will come along, in time.
SteveWMD - 29/03/2024
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