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Old Apr 29, 2009, 08:02 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
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48'' GRX-V1 3D Foamie(FREE PLANS)In multiple sizes and formats

Cant beat owens pink for big foamys,$8.00 for a 8x4 sheet. Cut this out over the weekend and put gear in it yesterday. Got two flights in today with it,doesnt need much.. probally a little expo adjustment and minor cg adjustment.

Specs: (Original Version)
48'' wingspan 51'' long
Auw 30-34 oz(could get it down to 30 oz or less on 3s set ups)
4 hs 65mg's or hs-81s or hs-85s
350-400 Watt outrunners
40-50amp esc's
Apc 12x6-13x6.5
Zippy flightmax,Turnigy etc 3s 2200 $10.00 packs



Owens pink and gorilla glue for the build.

Suggested hardware:Robart hinges.. packing tape will get you by,Still working on the rest but many will have stuff laying around or do z-bends for linkages and use standard control horns with a ply backing glued into the foam.. lots of options... i used hardware from a plane i took out of service. At some point it will have landing gear but that will increase weight and drag,for now its a belly lander in grass if your starting out(i dont suggest hand catching to anyone.. the prop can shred you).

Suggested Gear: MOTOR:350-400 watt outrunner (350 watts is plenty but some like more Power!),reaper gr-35,torque 2814-820,torque 2818-900 will all work well. LIPO: 3 to 4s 2200 lipo(cant beat $15.00-$25.00 zippys)use what ya got though,apc 12x6 to 13x6.5 prop,still want to try a xoar on this one(they sound sweet and pull good). SERVOS: Hs 65mg's work.. hs 85s would really rock(will try 3 dollar9g hxt hobbyking servos eventually). ESC: 45-60 amp esc's are plenty.

Throws And Expo:Throws in video(more than needed),elevator 60 degrees,rudder 60 degrees,ailerons 50 degrees,high rate starting point for 3d(i'll fly this soon).. 50 degrees on elevator,45 degrees on rudder and 40 degrees on ailerons.. this should work well for most 3d pilots,i'll figure out some docile low rates for more relaxed flying.

CG... Umm slightly nose heavy then adjust to your liking,need to borrow a cg stand to get a rough starting point,typically 30-33% back from the leading edge of the wing at the root.

Build Supplys: PU glue.. gorilla glue,sumo,elmers ultimate etc.. cheap,bonds well,absorbs shock and is very resilent(i'll add some tips for application.. it expands about 3 times its volume depending on ambient temps so dont over do it). A box cutter with a sharp blade works well or an exacto. A four foot straight edge. Blenderm if you dont use robart hinges. A couple 2x4s or other device to keep the fuselage and wings square while the glue drys.

GRX-V1 48'' Demo At Hobby Town USA Orland (5 min 27 sec)

Demo at the shop with yakzilla
46'' GRX Yakzilla At Hobby Town USA (Quick Demo Flight) (4 min 27 sec)


GRX 46'' Yakzilla Scratch Built 3D Foamie Trying A Couple Props! (4 min 36 sec)


Really nice video by Grnd0 with his Grx V-1(the original)
GRX V1 (6 min 8 sec)


GRX Park Jet Fun Flying! (3 min 23 sec)
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Last edited by Get Real; Jul 29, 2012 at 07:09 AM. Reason: updating
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Old Apr 29, 2009, 08:06 PM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
ohh nice looks like it should fly great
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Old Apr 29, 2009, 08:07 PM
Live to fly
bighead93's Avatar
Sacramento
Joined Apr 2005
5,569 Posts
That is cool!
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Old Apr 29, 2009, 08:13 PM
Registered User
Portage Michigan
Joined May 2006
206 Posts
excuse the blunt question, Where did you get the cut patterns?
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Old Apr 29, 2009, 08:20 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
Quote:
Originally Posted by steelydan
excuse the blunt question, Where did you get the cut patterns?
No patterns,just cut it out . I did do a rough trace onto another 8x4 sheet of owens for future changes though,made some small changes from the original cut. Really wanted to do all pull pull controls but didnt have enough odds and ends,it flys pretty well as is and i might make a couple more .
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Old Apr 29, 2009, 08:23 PM
Registered User
Portage Michigan
Joined May 2006
206 Posts
nice job
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Old Apr 29, 2009, 08:35 PM
I just want to fly
justwanttofly's Avatar
USA, IN, Jeffersonville
Joined Aug 2008
690 Posts
is there anyway that you could post some drawings and i could PDF and tile them for everyone.and post them is scratchbuilt fourm becouse that is one beauty and i would love to have it i know a perfect cheap motor for it ..show that at scratchbuilt fourms they will love it
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Old Apr 29, 2009, 08:36 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
Flight Video

Heres the video from when i flew it earlier today. I might change the aileron taper and or tips.. i always go easy on roll rates with foamys for some reason .

48'' GRX-V1 3D Foamy 4-29-2009 (7 min 26 sec)
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Old Apr 29, 2009, 08:42 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
Quote:
Originally Posted by justwanttofly
is there anyway that you could post some drawings and i could PDF and tile them for everyone.and post them is scratchbuilt fourm becouse that is one beauty and i would love to have it i know a perfect cheap motor for it ..show that at scratchbuilt fourms they will love it
That would be cool,ive posted a few 3d foamys ive scratchbuilt in the past and people ask but i dont have anyway to cad them for others and i usually just do one off designs without any drawings. This ones kind of rough and would need some cleaning up but your more than welcome to take a look at it to get the demensions and make some plans from it as is,the cuts would need some cleaning up. I figure with all the hardware etc ive got about 25 bucks in it,a lot of people have stuff laying around though and could put one together and just buy the foam.
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Old Apr 29, 2009, 08:47 PM
Registered User
Portage Michigan
Joined May 2006
206 Posts
that would be very generous of you to share that. I would build one for sure. after all I have repaired my T28 so many times thinking , I should just glue up my own....
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Old Apr 29, 2009, 08:48 PM
3d and other
kevbeer's Avatar
los angeles
Joined Jan 2004
1,068 Posts
I agree with Get Real - this is a well proportioned design for a 3d profile.

nice work dude.
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Old Apr 29, 2009, 08:49 PM
3d and other
kevbeer's Avatar
los angeles
Joined Jan 2004
1,068 Posts
where can I score this "owen's pink" or atleast check out the specs?

thanks bud
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Old Apr 29, 2009, 09:05 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
Its owens insulation sheets. Can pick it up at home centers,it sands pretty well and shapes.. i used it years ago to make scratchbuilt boats and even back then i thought i could make my own planes from it but i didnt fly rc at the time. Blucore will work as well,when i decided id do a few designs again a few weeks ago they didnt have any blucore so i used this to get things started. Owens foam info here.
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Old Apr 30, 2009, 08:25 PM
Flippin Multirotors
Get Real's Avatar
Illinois
Joined Feb 2006
5,040 Posts
If Youd Like To Build One!

Im gonna cut another one of these out next week. I'll make a short list of what kind of hardware is needed to complete one and try to get a rough cg,throws and expo settings etc. The plane will fly lighter on 3s probally at 350 watts or so but in the video its propped for 500+ watts on 4s. If anyones really interested and local that could make plans from a template of the next one they can pick it up in exchange for putting out some plans for the rest of you guys. I could also do a couple short kits for locals if they supply the sheet of foam and can pick it up.
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Old Apr 30, 2009, 09:30 PM
I just want to fly
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USA, IN, Jeffersonville
Joined Aug 2008
690 Posts
i wish i lived closer mapquest tells me 4 1/2 hours away i don't want to start up a frenzy but i would buy a set of traced out plans mailed to me if you had the time .lets say 15 bucks + postage.after seeing your video.

i really want that plane you are a genus or if you send the plans to me ill have my brother draw (i dont have a cad i just have a pdf and scale and tile program my bro is a cad master) it up and ill pdf it and tile it which ever way you want just pm me.and thanks for the offer wish i lived closer. did you use the 1/2 foam?
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