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GIANT Spad 3D - 1/14/2005 12:26:07 AM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		Hey Folks;

Call me crazy ............. but I am thinking of building a giant spad 3D with a 31cc Ryobi gas motor. Does anyone know if this has been done so I don't have to reinvent the wheel?

I was thinking of the usual spad 3D wing but doubled coro and a spar about six feet wide and a cord of three feet (what ever is proportionate to the reg. 3D). For a body I was thinking of a profile made of door skins, maybe a few holes to cut the weight down.

If I keep the weight down to 10 pounds the ryobi should fly it fine.

What do you folks think.

Thanks Peter
       Post #: 1

RE: GIANT Spad 3D - 1/21/2005 5:45:25 PM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		Holy Cow!!!!!!

Hard to believe I actually found you guy's without an opinion

Peter

(in reply to Peter G.)
       Post #: 2

RE: GIANT Spad 3D - 1/22/2005 1:50:29 AM   
exeter_acres



Posts: 6132
Joined: 9/22/2004
From: Johns Creek, GA, USA
Status: offline 		we are all still picking up our jaws




what I am finding is SPADS tend to stay a bit smaller.....
buddy of mine made a Draco....but made it quite a bit bigger than the plans.... I made a DPS that flys great but has a glide ratio of a rock so I am going to make a bigger wing....

or something to put my .91 4 stroke in.....

there just aren't that many spadders with big planes........
coro is pretty heavy for large surfaces.......but 3d flying is a perfect example of.. put a large enough engine on anything...and it will fly

if you can keep the weight down... it would be fine... just not sure if the coro would be strong enough... but only one way to find out!!!

_____________________________

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IMAC members, Thanks for voting!

(in reply to Peter G.)
       Post #: 3

RE: GIANT Spad 3D - 1/22/2005 2:59:32 AM   
DLSmith2



Posts: 527
Joined: 8/25/2002
From: Nacogdoches, TX, USA
Status: offline 		PeterG.,

I think Crazy Herb did some big PBF or 3D type stuff with pink foam, but I don't remember what type or size his powerplant was.

If you try SPADWORLD look in the "X-treme 3D" and "Biguns!" sections, you might find and answer to your question.

Don't forget to take pics!

Blue skies,

DL

(in reply to exeter_acres)
       Post #: 4

RE: GIANT Spad 3D - 1/22/2005 5:18:18 PM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		Thanks Guy's;

I spent some time in the spadtothebone web site and the links to the giant spad site but nothing that resembles the 3D had been made. I'll try spadworld.

The normal spad 3D is approx. 5lbs .......... so I thought if I double that (laminate two sheets together) it should be good for ten lbs. In theory . Actually laminated products are generally stronger.

I also know that a ryobi should hover a ten lbs plane. As well I have a ryobi kicking around. Thus the birth of this idea.

Thanks again Peter

(in reply to DLSmith2)
       Post #: 5

RE: GIANT Spad 3D - 1/22/2005 5:43:59 PM   
Turbobeaver


 

Posts: 301
Joined: 12/11/2003
From: Ottawa, ON, CANADA
Status: offline 		Hey Pete.The guy's flying the 3D's and 3DT's are well versed in "dirt napping" these suckers a time or two.Unlike these glow powered versions that allow you to walk away without too risk to the engine,you maybe not so lucky with your heavier more fragile gas engine.If the glow version glides like a rock,I hate to see what a 10lb. plus gas version glides like .The cranks on these gas engines are VERY easily bent when they go in and are usually irrepairable.I've seen 3 converted gas engines trashed over the last year due to this problem in my club alone.They just can't take the knocks it seems like the smaller size glow engines can.Them you just blow off the dirt,fuel them back up and away you go again.Oh,and did I say CHEAPER to? Good flying dude.

(in reply to Peter G.)
       Post #: 6

RE: GIANT Spad 3D - 1/22/2005 11:41:36 PM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		Thanks Turbobeaver;

I have a spad 3D and think they are such a great hoot. I normally only dork mine when I try to touch the tail or hover on top of another 3d spad . However you have a point about the crank that I did not really think about.......... and then I suppose it's a matter of time before I try to touch the tail with the big one......... but what a tail touch that would be .

Just a side note, a weed wacker is no more expensive than a glow engine.

Peter

(in reply to Turbobeaver)
       Post #: 7

RE: GIANT Spad 3D - 1/24/2005 2:37:37 PM   
Jack Hyde


 

Posts: 607
Joined: 6/18/2002
From: Red Bluff, CA, USA
Status: offline 		If you double wing span and chord , wing area is 4 times the original. If you then double the thickness the volume is 8 times the original. Weight goes up fast as plane get larger.

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Jack

(in reply to Peter G.)
       Post #: 8

RE: GIANT Spad 3D - 1/24/2005 4:05:50 PM   
-pkh-



Posts: 2502
Joined: 5/28/2004
From: Emmaus, PA, USA
Status: offline 		4mm coro weighs about 2.3oz per square foot... so if you scale the 3X2 sheet for the SPA3D wing up to a 6X4 sheet, and then doubled it, the wing coro alone will weight almost 7lbs...

< Message edited by -pkh- -- 1/24/2005 4:06:21 PM >

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Paul - Helis: Two Raptor 50V2s, Venture 30CP, Blade CX2
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(in reply to Jack Hyde)
       Post #: 9

RE: GIANT Spad 3D - 1/24/2005 8:43:55 PM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		Damn......................... Had not thought about it like that. I'll have to scratch my head a little on this one.

Thanks Peter

(in reply to -pkh-)
       Post #: 10

RE: GIANT Spad 3D - 1/25/2005 2:42:22 AM   
-pkh-



Posts: 2502
Joined: 5/28/2004
From: Emmaus, PA, USA
Status: offline 		If you want to cook up your own SPAD, I highly recommend making up a spreadsheet (Excel is great) with the unit weights of different materials you plan to use, then you can calculate the total weight for your plane, and calculate the wing loading, estimate thrust:weight ratio, etc. When I scale up SPAD plans for larger engines, or try to do something like make an electric version of a nitro SPAD, I try to keep wing loading about the same as the original design.

_____________________________

Paul - Helis: Two Raptor 50V2s, Venture 30CP, Blade CX2
Planes: Twist 150, Twist 60, Tribute 36, GP .40 Mustang

(in reply to Peter G.)
       Post #: 11

RE: GIANT Spad 3D - 1/25/2005 3:09:25 AM   
Turbobeaver


 

Posts: 301
Joined: 12/11/2003
From: Ottawa, ON, CANADA
Status: offline 		Actually Peter your probably right about the prices being competitive between larger glow engines and converted weedwacker engines but that doesn't have anything to do with how that equates to the power your going to get out of a weed wacker engine when all is said and done.If your working with a brand new 31c.c Ryobi engine from Home Depot lets say,it's still still going to cost you a minimum of around $170-$200CDN. to covert it over to airplane use($100 Ryobi 31cc,Wacker Engine conversion parts $71,turn down flywheel and balance $26).If you aren't a machinist,don't know of a machinist who owes you a favour,don't own a metal lathe and don't have a good source for old Ryobi's that still work,it can start to get pricey real quick.

Unfortunately,the Ryobi is never going to put out the type of power that a larger glow engine can and it will never be as lite weight.Unless you want to tack on the sum equivalent of a kings ransom for a CH ignition system to lose the flywheel,that's about the only way your ever going to get the weight down to be even slightly competitive to a comparable glow engine.Weed wacker engines just don't have the power to weight advantage that glow engines do.The heavier they are,the harder they hit .It will be interesting to see how you make out just the same with your endeavor.I salute anybody who has an ounce of original creativity and the gumption to follow through with it .Good luck with the project Peter.Looking forward to seeing it finished and flying.

(in reply to Peter G.)
       Post #: 12

RE: GIANT Spad 3D - 2/22/2005 8:31:34 PM   
chris6414



Posts: 654
Joined: 12/23/2004
From: Warminster , PA, USA
Status: offline 		Thats why I am going to convert my Poulan 33cc to glow. Lose that flywheel and ignition and it is close to the Super Tigre 3250 in performance. $40.00 or so for the adapter and prop hub and that free chainsaw comes out alot cheaper than the $200 for the 3250 even if it is heavier than the glow motor. I always wanted a big bore glow motor since I saw a BGX-1. What a monster that motor is!

(in reply to Turbobeaver)
       Post #: 13

RE: GIANT Spad 3D - 2/23/2005 12:09:32 AM   
Peter G.


 

Posts: 293
Joined: 8/1/2002
From: Terrace, BC, CANADA
Status: offline 		I am just finishing off 2 projects now, (a Ziroli B25 and a spad DDust) but plan to do something with the Ryobi.

Actually..... a Ryobi at Wally World is under $100.00/can. brand new and a Poulan chainsaw at Princess Auto is $79.00/can without the bar and chain, I think it is a 36cc. I make my own motor mounts, and the machine shop charged me twenty bucks. Where can you find a glow engine for $120.00 with that kind of HP. But you are right about power to weight ratio. I have a 1/4 scale cub with a Ryobi, at 15lbs she will not hover . Well who ever saw a cub hover. Otherwise it flies great, one of my favorite planes.

I am thinking of a profile body, like an edge 540 with the 3D wing........ maybe........ or maybe just a coroplast wing shaped like the edge 540. I know if I can keep the plane in around 10 - max 12 lbs it should hover. Thought maybe some other spadder would have attempted this by now and I could learn from him

Thanks Folks

Peter

(in reply to chris6414)
       Post #: 14

RE: GIANT Spad 3D - 2/23/2005 3:57:31 AM   
tinman 4009


 

Posts: 80
Joined: 4/6/2003
From: okc , OK, USA
Status: offline 		i have seen a 12ft wing span cub hover and knife edge the length of the field was too funny!!! was wayyyy over powered!!

(in reply to Peter G.)
       Post #: 15

RE: GIANT Spad 3D - 2/23/2005 12:59:58 PM