colvid
Flying officer
Posts: 12
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Post by colvid on Dec 3, 2008 4:57:03 GMT 1
Got the idea from another member. Has an Exceed 480 brushless. Had my friend Stuart take it on its test flight. It took off fine but would "porpoise"(???Spelling) He suggested moving the engine forward an inch + or _ Any suggestions? farm4.static.flickr.com/3028/3079226204_afce3128ca_o.jpg |
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Post by tlyttle on Dec 3, 2008 17:47:56 GMT 1
Page didn't work...
Biplanes take a lot of care to set up as far as incidence in concerned. Incorrect incidence on the lower wing could cause the porpoising the model is showing.
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Post by mrmugen on Dec 3, 2008 18:06:52 GMT 1
Lighten the tail as much as possible. Make sure the lower wing incidence is set to 1-2 degrees and top wing zero. Then your faced with how you set the wings up. Are they over one another? Or staggered? There is this page I refer to whenever I need to know anything. Here is the link homepages.ihug.co.nz/~atong/ You will find what you need to know here. Almost evey question has been asked and they address each one individually here. It is a great one to save for those days when ordinary just won't do. Kevin |
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colvid
Flying officer
Posts: 12
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Post by colvid on Dec 3, 2008 23:08:06 GMT 1
Thank you both for the good info and Kevin thanks for the web site link
Larry
PS Believe the photo will now open
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Post by admiralev on Dec 3, 2008 23:57:28 GMT 1
put a cowl on that puppy and it'll look great! nice work! you should mount the engine as far forward as necessary to get the prop shaft through the cowl and conform to the original thrust angle an CG. a lot of guys have done brushless mods here. check them out for some inspiriation
admiral
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Post by tlyttle on Dec 4, 2008 3:35:37 GMT 1
Ah, the old "which wing does what" debate begins. mrmugen follows one train of thought, ie, upper wing has more incidence than the lower, which is fine when the wings are staggered.
However... If the wings are one directly above the other, it is better if the upper wing has less incidence than the lower. The theory (and it works for me) is that if the lower wing stalls first, then the upper wing is still flying and imparts more stability (parachute factor).
Let the argument begin!
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Post by mrmugen on Dec 4, 2008 4:42:38 GMT 1
No argument here. I got it bass ackwards. Sorry man. I will edit my post. Thats what I was trying to get at.....stall the lower and it flies on upper, for landings it is sweet. Makes harriering much easier also.
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colvid
Flying officer
Posts: 12
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Post by colvid on Dec 4, 2008 5:20:36 GMT 1
Thanks all for the info. Have removed engine to move it forward. Admiral; have 4 other Super Cubs with brushless which fly great- Axi 2808/24, Exceed Alpha 480, Scorpion S 3008-28, E-Flite 450 which is a low wing monoplane.
Next project is tri-motor????I don't know why. Too much fun I guess.
Larry
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colvid
Flying officer
Posts: 12
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Post by colvid on Dec 4, 2008 5:27:10 GMT 1
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