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1/4 scale sopwith triplane

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Old 08-19-2010, 09:51 AM
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lazyace
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Default 1/4 scale sopwith triplane

OK guys I have a set of jerry Behrens 1/4 scale sopwith triplane plans and inst. manual , had the kit cut , been reading the manual 3 times and looking at the plans till I about go blind , but I can't find the cg or any wing incidence's , any one have any idea's , engine size ?

thanks charlie
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Old 08-20-2010, 04:15 PM
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Default RE: 1/4 scale sopwith triplane

Charlie . I have a 1/4 sopwith tri plane I drew it up myself , its 2 years old . have a 26 cc zenoah for power with a n apc 18-6 w prop . flys great for incidence it is flat across the bottom of the wing , like in a clark "Y" section , so think that is 2 degrees positve ?weight is 17 lbs balace is at back of the cabane on top wing 4-1/2 " from LE . I had it a away back at 1st another 3/4 " but got rid of a lb of lead to get it where it is now . I have rib stitching on wings . legit full size bungy on the axle for the l/gear . Hurri
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Old 08-20-2010, 04:38 PM
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Default RE: 1/4 scale sopwith triplane

Today I received the Tripe drawings that I ordered from Replicraft. Man are those something else (like all the other sets)! I'm thinking of enlarging them to 1/4 scale (124% increase to fit a 26cm aluminum pot for the cowl).
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Old 08-20-2010, 08:38 PM
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Default RE: 1/4 scale sopwith triplane

hurri

thanks for the info , I used the mac system and at 28% comes to 5 1/8 back from LE top wing is that to far back ? I was thinking a DLE 30 for power with a 18 x 8 xoar prop , any pics of LG ?

charlie
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Old 08-20-2010, 11:32 PM
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Default RE: 1/4 scale sopwith triplane

Incidence is relational, so all you have to do is draw your own relational lines on the plans for stab and the wings that will be easy to measure on the model and note the angle differences.
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Old 08-20-2010, 11:35 PM
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Default RE: 1/4 scale sopwith triplane

I've asked this before elsewhere, but is there any reason (other than "tradition") that a 1/4 scale or larger model can't just use exactly the same incidences (wing and tail) as the original? Assuming one is also using a scale airfoil.
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Old 08-20-2010, 11:55 PM
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Default RE: 1/4 scale sopwith triplane

For the most part you can use scale incidences, but for a model the scale incidences are too much for what is needed. More incidence is a way to "cheat" and get more lift out of the wing while the fuselage is level. We dont fly at scale weight and for the most part physics wont let us, so we need less "cheating." Bigger the plane the more incidence can be tolerated. When a plane climbs crazily with power and always has major trim changes on the elevator with different power settings, it is because the incidences are not in the best locations. A lot matters if you can tolerate it as a pilot, too.
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Old 12-08-2018, 07:11 PM
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Default Triplane

I have 1/4Scale Sopwith Tri-plane. Jerry Bergenís. Modified by Camden Custom Cutters. Need to find CG, any ideas?

Rich
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Old 12-08-2018, 07:13 PM
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Hello need help findin CG on my Triplane any help?

Rich
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Old 12-09-2018, 07:28 AM
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Originally Posted by Richbailey View Post
I have 1/4Scale Sopwith Tri-plane. Jerry Bergenís. Modified by Camden Custom Cutters. Need to find CG, any ideas?

Rich
Since the stagger on the Sopwith is evenly spaced you can still use the calculation of mean aerodynamic chord (MAC). If you balance at 25% of this measurement it should give you a mildly nose heavy model. Since you are building 1/4 scale you might look to the first few posts of this thread where others discuss the balance points of their 1/4 scale tripes.
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Old 12-09-2018, 08:39 AM
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Thank you Matt

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Old 12-09-2018, 08:53 AM
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I’m running a G110 electric motor. 5000 & a 3000 ma batteries. 2 3000 ma bat for flight control. Sound card for the engine and machine gun sound.
Wings and tail feathers are covered, fuselage is next. Need to secure speaker.

Rich
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Old 12-11-2018, 08:37 AM
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I don't know, aside from your post, how far along you are with your build but there is a builder here with the handle Foodstick. He seems to have had good results with 1/4 scale electric conversions.I'm sure I'm not alone in wanting to see a photo of your project.
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Old 12-11-2018, 10:02 AM
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This is a plane on the IF I LIVE LONG ENOUGH list ! hahahaha

Would make a great electric plane. And pretty cheap to do it.
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Old 12-23-2018, 09:29 AM
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Default Triplane

Hello lazyace

Have been building a 1/4 Scale Sopwith Triplane for about 2 years. Running a G110 electric motor from Dymondusa.com. Plans and short kit from Camden Custom Cutters, Camden. South Carolina.
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