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May 12, 2008, 05:33 PM
AMA 125691
wmcneal's Avatar
Discussion Extra 300- Free plans

I can never resist a free plan so I downloaded this one from Dave at two days ago and got busy. I still have to install the electrics,but I think it's going to be a nice one.

Since Dave removed the plan from his website I have posted it here.
Last edited by wmcneal; Jan 19, 2011 at 10:48 AM. Reason: post the plans
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May 12, 2008, 07:03 PM
Registered User
yardboz1's Avatar
Looks good. I also downloaded the plans, but then got busy with other builds. What are you planning on powering this with? Looking forward to a report on the maiden! BTW, coudn't help but notice your pilot looks a little like your avatar.

May 19, 2008, 09:33 PM
Cant you feel the freedom
NuttyPro67's Avatar
That Extra 300 is looking EXCELLENT! Post some flight videos if you can when she gets flight worthy.
May 19, 2008, 09:38 PM
AMA 125691
wmcneal's Avatar
Thanks! Just finished it tonight. It'll be ready for a maiden when the wind finally calms down around here. Here it is ready to fly at 15 oz. I added wheels and tail skid for takeoffs and landings. Power is a tower pro 2410-12 with a 9x4.7 APC prop
Last edited by wmcneal; May 21, 2008 at 09:04 PM.
May 20, 2008, 06:03 PM
Just one more flight...
RCSuperPowers's Avatar
That is so good wmcneal! What a paint job and the wheels take it to the next level.

Some info for all, here is the power set up I used on mine:

Motor: 2205-1350kv / 20A ESC
Prop: 10x4.7
Battery: 3S 700 mah, 15C
Servos: (3) HS-65

May 22, 2008, 10:26 PM
AMA 125691
wmcneal's Avatar
Well, the winds finally subsided enough this evening that I was able to go out to the park and test fly my new Extra 300 under the stadium lights after dark. I plugged in the battery, double checked the control surface movements and floored the throttle. After a roll of about 15 feet she rotated to vertical, whereupon I reduced the throttle and brought it into a nice hover about 25 feet up. It was not as stable as I thought it would be, so I pushed forward and leveled it out and trimmed it properly. After few more circuits around the field I landed it and replaced the 910mah battery with a 1350mah and took off again. It was more stable with the cg moved forward and was easier to hover. I then did some mild aerobatics and rolling circles, etc. I did harriers and knife edges. It was really fun! The only bad thing I noticed was that the fuselage twists while rolling fast. It is weird to see the horizontal stab out of alignment with the wing. It does return to normal once the air load is removed. I will have to figure out some way to brace it without adding too much weight.
May 23, 2008, 06:04 AM
Procrashtinating Builder
mastrsn's Avatar
Originally Posted by wmcneal
It is weird to see the horizontal stab out of alignment with the wing. It does return to normal once the air load is removed. I will have to figure out some way to brace it without adding too much weight.
Remember my big Red, White and Blue Tribute foamy? ( no longer in production ) It used to twist at the tail too. I think it's because both have long fuselages and 6mm foam doesn't have enough stiffness. I'd be careful trying to stiff it up and not add anymore weight. Then it won't 3d as well...
May 23, 2008, 11:08 AM
AMA 125691
wmcneal's Avatar
Yes I remember it.
I flew the extra again this morning. I now think some of what I was seeing was part optical illusion because of the ailerons being deflected so far. Anyway, it still flew great. I think I'll just leave it alone and concentrate on my 3d flying skills so I don't doink it.
May 23, 2008, 06:24 PM
Registered User
Hey Bill, saw you doing a knife edge with your new plane when I cut through the park on the way to work this AM....Knew better than to stop as I would have been late for work for sure....Did you see the post here where the guy added a truss system to help with the flex ??
May 23, 2008, 06:34 PM
AMA 125691
wmcneal's Avatar
Hey Bill. Thanks for the link. I just might try that.
May 24, 2008, 02:01 PM
Registered User

Where is the point of gravity of your plane ?
May 24, 2008, 02:26 PM
Cant you feel the freedom
NuttyPro67's Avatar
The center of gravity can be found on the FREE PDF plans that you can download at or at this link:
May 24, 2008, 03:13 PM
AMA 125691
wmcneal's Avatar
I fly mine with the center of gravity right on the wing spar, or 1.75" (45mm) back from the leading edge at the wing root.
May 24, 2008, 03:27 PM
Registered User
Oh yes i was blind sorry and Thanks for the answers.
May 25, 2008, 07:44 PM
AMA 125691
wmcneal's Avatar
Got a video of a flight this morning. It was a little windy, but it was still fun. Enjoy!

Stop that Pigeon (5 min 10 sec)
Last edited by wmcneal; Dec 03, 2009 at 09:14 PM. Reason: change video link

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