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Building Tips and technical articles. => 1/2 A building. => Topic started by: Jim Roselle on May 29, 2014, 07:15:53 PM
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I just finished a 1/2a version of F2g #84. I wanted to see how the gull wing performs before I invest in a larger version.
(http://i.imgur.com/OJotlhT.jpg)
(http://i.imgur.com/ChfqraI.jpg)
(http://i.imgur.com/1d2tN6u.jpg)
(http://i.imgur.com/HW21YRo.jpg)
(http://i.imgur.com/fnIMfVA.jpg)
I want to see how it flys before I invest in decals.
Jim
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Wow, Jim, that's a beauty. But... does your stabilizer have positive incidence? Maybe it's an illusion of the photo.
I accidentally did that to my Reed Speed Mustang. When I realized it, I used the dremel cutoff wheel to neatly remove it so I could re-seat it parallel to the centerline.
Rusty
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Wow, Jim, that's a beauty. But... does your stabilizer have positive incidence? Maybe it's an illusion of the photo.
Rusty
Rusty,
It's definitely 0-0-0. Must be an illusion created by the shiniest finish I've put on a chunk of balsa yet. LL~
Jim
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Remember bigger planes will almost always fly better than the small ones. The Corsair looks great.
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I've built bigger corsairs and they all flew very well. Yours should do just fine, Nice Job !!!! y1
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Way cool little model Jim, hope it works well.
I didn't notice an incidence issue, but taking a look at the top view photo it sure looks like the stab/elevator line is crooked. ???
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Way cool little model Jim, hope it works well.
I didn't notice an incidence issue, but taking a look at the top view photo it sure looks like the stab/elevator line is crooked. ???
Yeah I noticed that as well!!! My big issue is I need to add some rudder offset. I tried to launch from a stooge and it wanted to fly in and kill me. I gave it about three tries and packed it up while it was still in one piece. At least I know it's a sturdy build!
[youtube=425,350]http://youtu.be/zIvSzxTcZRQ[/youtube]
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. . . taking a look at the top view photo it sure looks like the stab/elevator line is crooked. ???
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Saw the same thing here. You might want to correct that.
Absolutely LOVE F2G Corsairs! Best of luck with it.
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I see now, what I thought was an incidence problem is a friggin reflection in your mirror finish. LL~
Is there enough speed at launch for the rudder offset to have any effect against turning into the circle? Propwash, I guess can help turn it out.
Rusty
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Check the wing tip weight.
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:##
Check the wing tip weight.
Thanks John,
I was thinking I would add weight in addition to rudder surgery.
Jim
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Alright,
I doubled the tip weight (I added a 2nd nickel LL~). Also split the rudder down the middle and added about 1/8" offset. I may upgrade to a Tee Dee if this fixes the launch issue.
Jim
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You don't suppose it has anything to do with the thrust line being outboard of the center of drag, do you? ^-^
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You don't suppose it has anything to do with the thrust line being outboard of the center of drag, do you? ^-^
A lot of the guys built like that and many failed to launch. Mine was mounted inside center of the fuse and took off like a normal sport 1/2A with no problem. My rudder had no offset, and 1/4oz tip weight on the 5.1 oz plane
Rusty
P.S. Thanks for helping us out, Larry, you and Paul G. It was fun and good for our fledgling forum.
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You don't suppose it has anything to do with the thrust line being outboard of the center of drag, do you? ^-^
I've seen several plans with this arrangement so I didn't think it would pose a problem.
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Lots more out-thrust angle will fix it. y1
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Lots more out-thrust angle will fix it. y1
I thank you sir.
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You don't suppose it has anything to do with the thrust line being outboard of the center of drag, do you? ^-^
Mine has the offset engine also (see the picture of the red Sea Fury in the CEF reed speed contest thread), and I had no issue with line tension on takeoff. Looking at the thrust line of the engine, it isn't offset with left thrust. I don't see a reason for it turning into the circle just by the pics. The leadout guides look about right, but I trust you did a hang test to make sure the leadout guides are aft of the c.g.? And, there's always a left hand prop.
I'm trying to picture what's happening when that gull wing comes out of the stooge. I assume it's a sleeve type stooge? When the outboard wing is in the stooge, the whole plane is tilted away from you, right? On launch, you'd naturally have some up elevator in it. When it releases, the plane would then roll towards the center of the circle. Is it over rotating and that causing it to fly into the circle?
Mark
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Mark,
Sorry I took so long to respond. It has some out thrust in the photos, it has a significant amount more now. I think it might be suffering from "anhedral roll in" like you described. That and I pointed the stooge out do it may be over centering in that plane as well. I will hopefully be hand launching Thursday so we'll see. It's not as pretty as it was now that it had rudder surgery and minor repairs. If it flies decent I may build a new slightly larger one with a Tee Dee or possibly diesel.
Jim
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Dig up a copy of the plans to Dick Sarpoulos' Corsair. I have one and it flies great. Blackhawk kitted it for a while.
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Alright,
Added side thrust:
(http://i.imgur.com/kgXZVXP.jpg)
Stooge launched successfully. Lead outs need to move back as the front is ahead of the cg, pretty loosey goosey on the lines. The main issue is weight, 9.2oz after repairs and rudder surgery. Insides and outsides were equal and it flys well enough to justify building a new, lighter version. Will do a build thread over on Cox Engine Forum.
Anyway, here's video from today
http://youtu.be/x0N8Kj0AQlQ
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Dig up a copy of the plans to Dick Sarpoulos' Corsair. I have one and it flies great. Blackhawk kitted it for a while.
Larry,
I have a copy of that flying models issue, using it for guidance on my new build.
Jim
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Hey, Jim, I'm glad to see it flies. That plane is too pretty not to fly. You were doing a little loose line jig now and then. I think you're right about moving the leadouts back. But it looks like it's got enough wing to fly if it had more power.
I bet if you put a Tee Dee on it it would fly great. One of my Baby Streaks weighs about the same and it's a nice flyer with a TD. You could get one of those aluminum backplates that the crankcase just screws onto like the one on my Li'l Satan you've no doubt seen in the Traveling Engine thread at CEF. Or better yet, a Big Mig .061 would really make you smile. Hank at Texas Timers sells those backplates for both of those engines. I'd love to see you give it a try.
Rusty
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Rusty,
My plan for more power is to use a diesel conversion to tug it around the sky. I may throw my AME .049 on it just for fun. VD~
I've already started cutting wood for a new one. I want something to run in the engines for my Reed Speed planes.
If you think the black one is pretty wait until you see the next one!
Jim
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Neat F4. Back in the 70-73 era, we flew 1/2A Good Year in Pocatello, Idaho. No rules then, so we just called 1/2 A Mouse Race, except lthe plane had to be a recored holder or a Reno Racer or Pylon Racer from the 30's.
Any way, Al Culver had an F4U or F2G with clipped wings and tip plates like Cook Clelands Corsair. It moved out and took me two months to find the secret to beat him. Pure stock TD .049's but there is one trick to highter RPM's. H^^
I am assuming F2G is FAI Good Year???
Ty,
F2G refers to a F2G Super Corsair:
http://www.airrace.com/CorsairStatusList2.html
Here's my version of Cook Clelands corsair:
(http://i.imgur.com/3YTGl0b.jpg)
It's basically a mouse racer built for Cox Engine Forum Reed Speed. You should check out the event if you like scale mouse racing!
Jim
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Is the white one here with the cowling yours too Jim? Great looking little plane! y1
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Is the white one here with the cowling yours too Jim? Great looking little plane! y1
Yes that's mine, thank you. Here's #3 coming along nicely:
(http://i.imgur.com/RvHGYBu.jpg)
Going for this finish on it:
(http://i.imgur.com/ggOavN3.jpg)
If anyone has advice on masking numbers I'm all ears!
Jim
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Well I feel really stupid. I know of the two F2G Corsairs, but the way the title of the thread was , it looked like an FAI event, like F2B. Had F4U on the brain. DOH.
At any rate, a very neat model. y1
Well, you're up one on me Ty, I only knew of the F4U before reading this thread...and yes, a neat model! ::)
George
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Alright, got #2 done today:
(http://i.imgur.com/q9ZgptK.jpg)
(http://i.imgur.com/Lt4JkSY.jpg)
Got around the thrust line being outside the center of drag conundrum by shaving the backplate and insetting the motor into the fuselage. Almost the same trust line as beam mount tee dee:
(http://i.imgur.com/XBhY0Q2.jpg)
(http://i.imgur.com/JOzBAZM.jpg)
(http://i.imgur.com/H3Y616U.jpg)
I hope to fly on Saturday, will try to video.
Jim