gcrowder2
Joined: 09 Jan 2006
Posts: 136
Location: Golden, Colorado USA
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 Posted: Wed Oct 01, 2008 7:41 am Post subject: Stratos files for X-Plane |
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.ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Tahoma;} .ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Tahoma;} Hi Peter and Lance - I have attached the X-plane V7 Stratos .acf file. I sent the files to your personal email as Matronics will not accept anything but basic .jpg C .bmp C .pdf type
files. If anyone else would like them C email me off list. The designation indicates 110 sq ft and 50 hp. The wings use the NACA 23012 low moment .afl file C
vstab uses NACA 0012 symmetrical .afl. On X-plane V7 C the .afl files used on a particular .acf file need to be in the same directory where the .acf file is located.
I have added a bellyboard instead of flaps so this uses the bellybord.afl file. On the version I have created C all control surfaces are on the lower wing C making it much easier to build.
After much experimentation I found that flaps really aren't necessary as they only lowered stall speed a mph or so and there were four of them C adding a lot of weight and complexity.
The bellyboard is very effective at glide path control C being much lighter and easier to construct. Just don't forget to retract it in a go-around or touch and go!
There is some kind of bug with the engine start as it won't start with the throttle at idle. Advance the throttle about half and then hit the ignition key with your mouse. Leave the
brakes on or else the plane will rocket forward! Set about two lines of up trim for TO. You don't have to pull any back stick as the plane will rotate automatically about 80 kts C
40 kts if you pull hard back stick! The a/c will begin a slow long period pitch oscillation until you stabilize it with the stick. Raise the gear and as you climb C start reducing up trim.
Stabilize the climb about 100 kts then at altitude C feed in down trim a bit at a time. Top speed will stabilize at 160 kts but it takes quite a while C the trim becoming extremely
sensitive. Rolls are very axial C loops are easy. The tip rudders work but there's a bug in that I can't figure out how to make just one rudder deploy outwards while the other
remains neutral. They both move together currently both left and right but still work. They are really never needed in flight except to enter a spin as the a/c stays coordinated
all by itself. Try slowing down to 40 kts by reducing throttle and adding up trim. At stall C the a/c will just bob its nose gently. You will still have roll control C although a bit sluggish.
For landing slow to 70 kts in the pattern C lower the gear C deploy the bellybord - the nose will pop up briefly - then stablilze at about 65 kts. Level out at the threshold and just
gradually pull back stick until the mains hit then lower the nose. Don't pull too much back stick or it might take off again briefly followed by a hard bounce. Very easy to fly overall C
aerobatic and mild mannered. I haven't got it to do anything nasty but maybe someone else can! I would be interested in any feedback.
Hoping to use the Axiro XR-50 engine C very light at 15 Kg C with a turbo'ed version used recently on a world altitude record breaking flight on a powered PPG C flying neatly over
Mt Everest in the process!
Glenn
Date: Sat C 27 Sep 2008 17:06:56 -0400
From: peterz(at)zutrasoft.com (peterz(at)zutrasoft.com)
To: gcrowder2(at)hotmail.com
Subject: Re: New tandem wheel flying wing biplane - this one's different!
Hi Glenn C
Thanks for the clarification C and I would definitely be interested in the x-plane model. I'm hoping it will work on V9 - I think it should.
Cheers C
Pete
On Sat C Sep 27 C 2008 at 1:42 PM C glenn crowder <gcrowder2(at)hotmail.com (gcrowder2(at)hotmail.com)> wrote:
[quote] Don't know the exact answer but the designer was not killed while flying the original prototype. The original proto is still flying and is flown by Charles son C
Ron Ligeti C an aeronautical engineer C who is reverse engineering the prototype to create new open source plans that will be available on the website.
According to the site C Charles was test flying a new larger version to become a kit version of the a/c.
'A channel or third wing was added to the fuselage. The bottom of the channel blended into the duct. Two different accounts of the purpose of the duct have been advanced:
Ron Ligeti's interpretation is that the ducted fan drew air over the channel to create a low pressure area and increase lift.
Romeo Garcia C a member of the original construction team C reports that the purpose was to channel more air into the duct for improved propulsion.
It is believed that one or more of these modifications changed the stall characteristics significantly C possibly by occluding or creating turbulence ahead of the duct at a high angle of attack.'
I have a theory that the rhino rudder as installed on the proto to yaw the plane for landing without banking might behave unpredictably in a high angle stall scenario but
thats just my speculation. On the sim I have eliminated the rhino rudder and gone to a retractable tri gear setup to allow more ground clearance for a larger prop.
I can attach the sim for X-plane V7 if anyone is interested but it will have to wait until I get a new hard disk for my desktop as it got hammered yesterday!
Date: Sat C 27 Sep 2008 12:22:39 -0400
From: peterz(at)zutrasoft.com (peterz(at)zutrasoft.com)
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: Re: New tandem wheel flying wing biplane - this one's different!
Very slick design - but one question: As the original designer died in it in a 'stall accident' what are the changes that you have made in the x-plane version from his original which has made it stall-proof (ala canard) C while his obviously was not?
Cheers C
Pete
A239
On Sat C Sep 27 C 2008 at 10:06 AM C glenn crowder <gcrowder2(at)hotmail.com (gcrowder2(at)hotmail.com)> wrote:
[quote] This is an incredible concept that has not been utilized IMO. The joined wing concept is the most efficient per NASA studies
http://www.aoe.vt.edu/design/ikelos/ as it eliminates the draggy tip vortices that plague all other designs. The Stratos has
an L/D of 19/1 and the original needed flaps to degrade the glide enough to allow a steeper landing approach. You have
effective sailplane efficiency in a very compact planform. In addition the wings can be made much lighter as the joined wing
at the tips adds great strength. The lower wing is totally flat with no dihedral making it easy to build. The upper wing needs
no twist and uses 2 deg dihedral. Other advantages are much stronger pilot/passengers protection due to the cage type construction C
wide tolerance of CG changes and greater tolerance for gusty conditions due to the short wings.
On the sim it is possible to take off with the stick full back C just wait for rotation and the a/c will just climb away bobbing its
nose with full roll and yaw control. Fully aerobatic too but pitch sensitivity is a little much for landing in this mode C easily
corrected with a pitch limiter for landing. Don't see why the concept couldn't work for crowd killers as well as the short wings
should allow twice as many gates at the terminal.
Very cool pic: http://www.ligeti-stratos.com/assets/images/hg_3_big.jpg
From: craigb(at)onthenet.com.au (craigb(at)onthenet.com.au)
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: RE: New tandem wheel flying wing biplane - this one's different!
Date: Sat C 27 Sep 2008 11:14:23 +1000
How weird is that C the design is very close to one I was considering to scratch build before i started on my XS C glad to know it will
fly ok C I didnt think anyone else would like such a departure from the 'norm' C my only concern was where to put the prop C I was thinking
about belt drive ducted fans between the two wings
[quote] --
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