Extra 300 (oz3606)
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.
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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.
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 https://en.wikipedia.org/wiki/Extra_EA-300
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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User commentsHi 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
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