Biplane Wing Incidence - Well kept F3A secret or nobody knows for sure.
03-10-2016, 12:44 PM
#52
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.
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.
03-10-2016, 11:49 PM
#53
Join Date: Jul 2005
Location: Oslo, NORWAY
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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,
Henning
03-11-2016, 12:15 AM
#54
Thread Starter
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
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
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.
Br,
Henning
04-08-2016, 01:14 PM
#58
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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
04-08-2016, 02:26 PM
#60
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
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.
04-28-2017, 11:34 AM
#62
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...
04-28-2017, 12:46 PM
#63
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...
04-28-2017, 04:19 PM
#64
09-04-2018, 10:15 AM
#65
Hi,
I am currently building an Ascent Bip from Naruke Hobby. This is basically the same plane Onda used as his A model at the WC 2015 just with the old name Acuracy. I bought a kit for the GP version and have converted it into electric with a hatch at the top as on the Oxai EP version.
I am almost new to biplanes. Had a Miss Wind 50 from Sebart some years back but never measured the incidents on that plane.
When building kits I am so lucky that I have a full size drawing with the planes datum line and incidence for motor, stab and wings. What I am trying to figure out is how the plane will present in the air. If I misunderstand the concept my colour scheme can look like the plane is either flying with the tail low or too high.
The motor trust and the low wing are inline with the fuse datum line. So with this two as 0 degree the top wing will be -1 degree and the stab +0,5 degree. I assume both wings will have to fly with positive angle of attack so the bottom wing will be more then +1 and the top wing will be more than 0 degrees?
Input is appreciated.
I will upload some pictures.
Br,
Henning
I am currently building an Ascent Bip from Naruke Hobby. This is basically the same plane Onda used as his A model at the WC 2015 just with the old name Acuracy. I bought a kit for the GP version and have converted it into electric with a hatch at the top as on the Oxai EP version.
I am almost new to biplanes. Had a Miss Wind 50 from Sebart some years back but never measured the incidents on that plane.
When building kits I am so lucky that I have a full size drawing with the planes datum line and incidence for motor, stab and wings. What I am trying to figure out is how the plane will present in the air. If I misunderstand the concept my colour scheme can look like the plane is either flying with the tail low or too high.
The motor trust and the low wing are inline with the fuse datum line. So with this two as 0 degree the top wing will be -1 degree and the stab +0,5 degree. I assume both wings will have to fly with positive angle of attack so the bottom wing will be more then +1 and the top wing will be more than 0 degrees?
Input is appreciated.
I will upload some pictures.
Br,
Henning
09-04-2018, 10:44 AM
#66
09-04-2018, 12:20 PM
#67
09-04-2018, 04:30 PM
#68
My Divergent has the lower wing set to 1 degree positive, the upper wing set to zero, motor at zero and stabs set to carry no trim. Up lines are perfectly straight, down lines need a very small down elevator mix. Knife edge pulls just a little bit to the canopy both directions. I would throw in a rudder/elevator mix to fix that however in level flight application of rudder yields yaw only. Overall very happy with my first pattern airplane design effort. I feel it will only get better as I learn more.
09-11-2018, 11:36 AM
#69
CK Aero | Triangulation Trimming Guides
The Answers are here V4 trimming guides including setup for the bipe wings
and trimming guides for both bipe and Mono
Bryan
CKAero.net
The Answers are here V4 trimming guides including setup for the bipe wings
and trimming guides for both bipe and Mono
Bryan
CKAero.net
