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Biplane Wing Incidence - Well kept F3A secret or nobody knows for sure.

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Old 03-08-2016, 09:42 PM
  #51
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Xareltoo. Exceptional bipe

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Old 03-10-2016, 12:44 PM
  #52
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Quote:
Originally Posted by MTK View Post
Ken, roll coupling is mostly a function of dihedral. Amount of elevator when inverted is a function of CG and incidence.

with wing, stab and engine down thrust at zero, the bipe may not fly as expected. Suggest to add about 1 degree of down thrust in addition to keeping wing and stab at zero. It will clean up the up lines among other things.
Matt and others, this biplane incidence thing seems to be all over the board and I'm seeing that it's not a one size fits all. As Ken has stated the Bucker shows 0-0-0 while the other two Dave Patrick designed Ultimates have 0-0 with +2 on the stab. I just finished up an old Circus Hobbies Reed Falcon 120 and it is set +2-0-0, the +2 being up thrust and calling for no right thrust. I only have 3 flights on it so far so not much to tell as far as incidences are correct or not, I did notice it has the need for right thrust so that was added. If you look at a plan that someone posted it looks like the top wing has washout and the bottom does not. It's looking like there is more then one way to skin this cat.
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Old 03-10-2016, 11:49 PM
  #53
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After studying several pictures of paint jobs of the the Ascent and the previous Acuracy I am designing a colour schema that is based on both wings flying with positive angle of attack.



I am using Oracover (Ultracote) and had some progress last night.


Br,
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Old 03-11-2016, 12:15 AM
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Hi Henning,
Have you given any thought to changing the incidences from those given on the plan ?? ( i know it.s a Naruke design) .
Setting both wings the same is the option that always comes to my mind.

Brian
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Old 03-11-2016, 12:38 AM
  #55
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Hi Brian,


As my experience with bips is limited. I will set it up as advised on the planes and go from there. Both wings are build into the fuse and are not that easy to change when it comes to incidence. Motor trust, CG and the stab will be the first to be adjusted if I have to do any.


I have the Aries 07 and Acuracy mono from Naruke and on both I had to move the CG 10-20 mm forward of the recommended settings. My preferences are a bit different than what Mr. Naruke prefer. The flying style and speed can be different.




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Old 03-30-2016, 10:43 AM
  #56
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Technically, incidence would be measured from the chord line of the stab. Here's the explanation http://www.rcflightschool.com/Setup_...denceIntro.pdf
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Old 04-08-2016, 10:50 AM
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My Acuracy and my Amethyst both have 0.5+ in one wing.
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Old 04-08-2016, 01:14 PM
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Hi,


The Ascent BIP had the maiden flight today. 4 clicks of up elevator and I was able to fly knife edge both ways without any couplings. This has never happened to me before on a maiden flight. My Acuracy mono took 100+ flights of trimming to have it fly mix free.


The incidence are as per the drawing. Low wing and motor have 0 degree to the fuse datum line. The topp wing -1 degree and the stab 0.5 + (lifting the nose). I used 5000 packs today but will use Hacker 4150 packs at 900 grams once they arrive. The total wight will be 4800 grams. Looking forward to fine-tune the model and start practise P and F17.


Br,
Henning
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Old 04-08-2016, 01:18 PM
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and some more
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Old 04-08-2016, 02:26 PM
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Quote:
Originally Posted by Henning View Post


Hi,


The Ascent BIP had the maiden flight today. 4 clicks of up elevator and I was able to fly knife edge both ways without any couplings. This has never happened to me before on a maiden flight. My Acuracy mono took 100+ flights of trimming to have it fly mix free.


The incidence are as per the drawing. Low wing and motor have 0 degree to the fuse datum line. The top wing -1 degree and the stab 0.5 + (lifting the nose). I used 5000 packs today but will use Hacker 4150 packs at 900 grams once they arrive. The total wight will be 4800 grams. Looking forward to fine-tune the model and start practise P and F17.


Br,
Henning
Looks good. You did a good job of covering the fuse instead of painting.

I think positive incidence on the stab would drop the nose not raise. The 4 clicks of up elevator indicates that the stab incidence needs to be reduced. Maybe 0 degrees would be better.
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Old 04-08-2016, 08:15 PM
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Realy a good job there Henning, looking forward to see it live on the field
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Old 04-28-2017, 11:34 AM
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Malcom is spot on. For all you guys promoting 0 incidence (decalage) under the hypothetical guise of the plane being neutral upright and inverted and throughout speed changes, just one problem with that theory: Gravity isn't zero, and until someone develops an anti gravity device, lift has to be generated somehow, e.g., either through incidence or trim (when trim is used it only works for one speed, of course). Go...
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Old 04-28-2017, 12:46 PM
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Quote:
Originally Posted by rcfs View Post
Malcom is spot on. For all you guys promoting 0 incidence (decalage) under the hypothetical guise of the plane being neutral upright and inverted and throughout speed changes, just one problem with that theory: Gravity isn't zero, and until someone develops an anti gravity device, lift has to be generated somehow, e.g., either through incidence or trim (when trim is used it only works for one speed, of course). Go...
Incidence and decalage are two different things.
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Old 04-28-2017, 04:19 PM
  #64
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Quote:
Originally Posted by drac1 View Post
Incidence and decalage are two different things.
Since most stabs parallel the datum line, for all practical purposes they're the same 99% of the time
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