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Old Dec 24, 2013, 04:16 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,384 Posts
Cool
Gee Bee R2 PBF with Plans and Graphics

With the successful experience of the 23" Nutball and some interest in a similarly loaded Gee Bee style pizza box flyer, I thought that I should develop one.

Here are the specifications;

- Wingspan 21.5"
- Wing Area 450 sq. in.
- Motor - HXT, Turnigy, or KEDA 2730 1500-1700 Kv 24g
- ESC - 10-15A
- Propeller (1500 Kv) 9x5 or (1700 Kv) 8x4.3
- Battery 750-1000 mAh 2s or 3s
- Servos HXT 5g (three)
- Estimated AUW 8-9 oz.
- Projected wing loading at 8oz = 2.56 oz per sq. ft. and at 9 oz = 2.88 oz per sq. ft.

Not sure about the spats, but they look cool and can be removed if they become troublesome.

Ken
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Last edited by dz1sfb; Dec 28, 2013 at 05:16 PM. Reason: Added content
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Old Dec 24, 2013, 04:17 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,384 Posts
Plans will be forthcoming once I cut, assemble, and test fly. Next week maybe.

Ken

Edit: This one seemed to simple to wait. Plans in the above post now.
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Last edited by dz1sfb; Dec 25, 2013 at 10:31 AM. Reason: correct plans release.
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Old Dec 24, 2013, 07:13 PM
flyin' fool
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Vancouver Island, Canada
Joined Jul 2003
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Wow! Great stuff. Once you spend a bit of time fine tuning a PBF, they can't be beat for fun and performance. Mine GB PBF as set up now flies extreme aerobatics with ease, has no pitching at speed, but requires a bit of down for inverted flight.

My spats were flexible and telescoping (sort of) to take the landing compression. But in the end to fiddly diddly and always needed attention. So, yes, make them removable for static display.
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Last edited by goldguy; Dec 24, 2013 at 07:41 PM.
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Old Dec 24, 2013, 09:25 PM
Watt Waster
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Joined Oct 2010
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PBF Gee Bee R2

Always did think this was one very cool design for a PBF and I have enough EPP to do one in the near future.
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Old Dec 24, 2013, 09:47 PM
Wake up, feel pulse, be happy!
C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,389 Posts
Crap! Reminds me I've got a PBF waiting for electronics. Surfaces are hinged and everything. Might have to slice a little more Depron and make it look pretty like this one.

My recurring issue with these damn things is that they're so lightly loaded by default that I can stick a brutal monster of a drive on the nose and still have it fly like a snappy Slow Stick until the throttle gets past... like... ten percent? I always plan to do these light, low-power front yard floater builds, and I always end up with 'roided-up Frankensquares
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Old Dec 25, 2013, 10:32 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
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Merry Christmas and Happy Holidays my friends.

Plans and graphics are now in the first post.

Ken
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Old Dec 25, 2013, 11:47 AM
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Shelby Twp, MI
Joined May 2006
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Thanks Ken,

But I think we both do better if I order the kit from you, since you do such a great job on them.

BTW, my nephew in Dickinson loves the NutBall kits you and Don sent, and wants to make them an OTC item for their hobby shop.
Merry Christmas back at ya!

-Dave
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Old Dec 25, 2013, 06:52 PM
AKA Don
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United States, MI, Houghton Lake
Joined Dec 2002
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Dave,
I'd be glad to help you, your nephew and others with gear for this one too.
www.strongrcmotors.com
Don
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Old Dec 25, 2013, 07:46 PM
ewo
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Spencer In.USA
Joined Oct 2003
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Quote:
Originally Posted by dz1sfb View Post
Merry Christmas and Happy Holidays my friends.

Plans and graphics are now in the first post.

Ken
Thank you Ken
Love this plane . I got the foam and the PP3 is all warmed up . Plenty fresh markers .
Just gotta make the necessary mods to use all the above. you know the rest !
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Old Dec 25, 2013, 08:09 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
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The build has begun

Got started on the build today. One thing I noticed is that the landing gear setup puts the wheels directly under the CG when level. Will move the gear legs forward 1".

The weight as pictured is 4 oz.

Ken
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Old Dec 26, 2013, 09:11 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,384 Posts
Paint and Basic Airframe Complete

Got the big stuff done today, paint and basic airframe assembly. Next is the plywood parts, and carbon rod/aluminum tube gear leg/shaft assembly.

I decided to give the gear position a go as designed. I never have landed my PBFs 2 point.

In case you are wondering I put the trim on by printing full size on card stock and making stencils to trace the edges.

Ken
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Old Dec 27, 2013, 09:12 AM
flyin' fool
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Vancouver Island, Canada
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wacha' usin' for glue?
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Old Dec 27, 2013, 09:15 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,384 Posts
Quote:
Originally Posted by goldguy View Post
wacha' usin' for glue?
Bob Smith Foam Cure. Much more economical than Foam Tac, which I like also.

Ken

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Old Dec 27, 2013, 09:18 AM
Winging it >
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Great looking pbf project Ken; I really love the Gee Bee looks!
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Old Dec 27, 2013, 09:29 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,384 Posts
Something that I am pondering is CG with a 24g Blue Wonder motor. If I have to ballast it, then I might consider moving the wing leading edge aft a bit and leaving a horizontal nose profile. We'll see once the gear is installed. The goal is to keep the wing loading light. Doing this kind of mod will reduce wing area.

Another option, and maybe even more desirable is to use a heavier motor. The Suppo 2208-12 turns a 9x4.7 prop on 2s very efficiently. Usually yielding flight times around 20 minutes on 900 mAh 2s battery. I happen to have one or two of those in my stockpile.

Ken
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