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Gas profile - 12/30/2012 10:52 PM   
jp1961


 

Posts: 74
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Last Login: 5/18/2013
From: metamora, MI, USA
Status: offline 		My current winter project. A Yak profile with a Homelite 25cc for power. I'm thinking outside the box by using extruded polystyrene foam (1") for the fuselage core (5/32" plywood outer skins). All electronics (minus aileron servos) will be inside the fuselage. Wings are expanded styrofoam. Channels were routed in the foam for servo wiring. Fiberglass was added between the foam and plywood. I may have to add an additional layer on the outside of the plywood.



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RE: Gas profile - 12/31/2012 2:45 AM  1 votes
ahicks


 

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Last Login: 5/21/2013
From: Waterford, MI, USA
Status: offline 		Neat!

Just an observation though? After a few "less than graceful arrivals" over the last 2 flying seasons (which didn't seem to be all that bad at the time), I managed to break my fuse completely in half right behind the wing .... 3 different times (67" OMP Fusion). This would happen with no other damage anywhere. Got fairly predictable. If a wing tip catches first, doesn't seem to matter what speed that occurs at, the fuse will not survive it? By checking out a few build videos, I see thinking is to run tubing down through the center of the fuse for this exact reason. Tired of fixing that fuse, my somewhat tired (beat!) Fusion has been retired. I've had so much fun with it, and learned so much, a new Mojo 65 should be here any day now!

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RE: Gas profile - 2/6/2013 6:43 PM   
JWilliams



Posts: 1515
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From: Georgetown, IN, USA
Status: offline 		JP1961, foam core fuselages sheeted with balsa is nothing new to profiles. Been done many times and it works well, to address ahicks concern of the fuse breaking behind the wing, well you can install CF tubes in the fuselage. Judging off your picture it may be too late for that at your stage of construction. Good luck on your project.
Jeff Williams

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RE: Gas profile - 2/6/2013 11:02 PM   
closetguy


 

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From: berlin hts, OH, USA
Status: online 		should be strong with the 5/32 ply you sheeted with,most are sheeted with 3/32 balsa.

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RE: Gas profile - 2/11/2013 6:04 AM   
Ernie Misner



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From: Tacoma, WA, USA
Status: offline 		Cool! Did you take the basic design from any other plane? Did you convert the Homelite?

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RE: Gas profile - 2/14/2013 5:32 PM   
flygilmore



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From: Dublin, VA, USA
Status: offline 		Seems neat and I know that its fun to do engine conversions but that Homie is going to add a lot of weight for little power. The best Homelite was the 33cc out of the Ranger and Bandit saws. Still though, heavy by todays standards on all the small gassers. I bet an XYZ 20 or DLE 20 would give you a lot more power for more than half the weight.
Good luck!

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RE: Gas profile - 2/24/2013 11:45 AM   
keyman


 

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Last Login: 5/15/2013
From: Putnam county, TN, USA
Status: offline 		Any updates?

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RE: Gas profile - 3/9/2013 12:57 AM   
jp1961


 

Posts: 74
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From: metamora, MI, USA
Status: offline 		Yes, I converted the Homelite. I have a Bridgeport and lathe in my basement. I posted a new thread with a picture. I basically copied and enlarged a SIG Fazer profile.

Jeff

< Message edited by jp1961 -- 3/9/2013 11:05 AM >

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RE: Gas profile - 3/19/2013 10:19 PM   
karolh


 

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From: Mandeville, JAMAICA
Status: offline 		I just completed a scratch built gas profile using a similar method of fuse construction, except I used 1/2" wide x 3/8" hardwood spars for framing the fuse which was covered with 3/16" thk. lite ply door skin with numerous lightening holes. For rigidity I installed 2- 5/16" O.D. CF rods from midway the fuse right to the end. The 64" span wing panels are from a crashed Katana that were donated for my build project and for power I have a Mintor 22cc up front. My design was based on being a general sport flying model, no major 3D stuff and it's specs are:

Wingspan 64"
Length 59"
Wing area 810 sq."
Weight 8.5 lbs

Karol

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RE: Gas profile - 3/20/2013 12:33 PM   
ahicks


 

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From: Waterford, MI, USA
Status: offline 		Nice job Karolh! Hope it flies as nice as it looks. Choice of materials interesting, but at 8.5lbs, it sounds like they really worked out well!

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RE: Gas profile - 3/20/2013 3:54 PM   
karolh


 

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From: Mandeville, JAMAICA
Status: offline 		I was really shooting for an AUW of 8.0 lbs. and in retrospect if I ever decide to build another I would use hard balsa spars for the framing and run the CF rod from nose to tail which I think would put me right in the weight range I was hoping for.

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RE: Gas profile - 3/20/2013 10:24 PM   
acerc



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From: lithia, FL, USA
Status: online 		If your worried about being too heavy this is my profile,  a Swanyhouse primo 65"ws and it weighs 7lbs on the money and is a floater. So I think you will be ok at 8lbs.

< Message edited by acerc -- 3/21/2013 1:30 PM >


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RE: Gas profile - 3/21/2013 4:29 AM   
karolh


 

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From: Mandeville, JAMAICA
Status: offline 		I am not overly concerned about the weight but lighter most times flies better. How about sharing a picture of your profile.

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RE: Gas profile - 3/21/2013 1:22 PM   
acerc



Posts: 3073
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From: lithia, FL, USA
Status: online

Pics? Gladly.



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RE: Gas profile - 3/21/2013 5:34 PM   
karolh


 

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From: Mandeville, JAMAICA
Status: offline 		Thanks for sharing, now that's a really nice looking model and I just love the covering pattern and no need to ask your nationality That sure is a whole lot of wing no wonder it floats, how much sq. ins. is it.

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RE: Gas profile - 3/21/2013 10:54 PM   
CanCanCase


 

Posts: 92
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Joined: 12/4/2006
Last Login: 5/17/2013
From: North Bend, OR, USA
Status: offline 		Primo 65? When did that come and go unobtanium? The largest Primo I see on Paul's site is a Primo60, which has a 55" wingspan. Even at that, your Primo wing has close to double the area of karolh's Katana wings. Even at 7 lbs, that much area will certainly float. I've put a Saito 20cc 4-stroke gasser on a Mojo60 before... it's got the big wing like the Primo, and could handle the extra weight of that motor. I don't think an 8 lb+ bird with nearly double the wing loading would like that heavy of an engine, but maybe that's just my flying style too...

I think when I'm ready to play with 20cc gas again, it will be on an EE60, Ron Williams Sbach65, Mojo65, or the big Slide coming out.

-Case

quote:

ORIGINAL: acerc

If your worried about being too heavy this is my profile,  a Swanyhouse primo 65''ws and it weighs 7lbs on the money and is a floater. So I think you will be ok at 8lbs.


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RE: Gas profile - 3/22/2013 12:40 AM   
acerc



Posts: 3073
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From: lithia, FL, USA
Status: online 		My apologies on the wingspan, it is 55". And the wing area is 1000sq. in.


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RE: Gas profile - 3/22/2013 6:38 PM   
karolh


 

Posts: 5628
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From: Mandeville, JAMAICA
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quote:

ORIGINAL: CanCanCase

I don't think an 8 lb+ bird with nearly double the wing loading would like that heavy of an engine, but maybe that's just my flying style too...

-Case

My model was designed primarily as a sport model and with a wing loading of 24.2 ozs. /sq.ft is in the range of most sport types having excellent flying manners.

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