rotax618's latest activity
Help Support Homebuilt Aircraft & Kit Plane Forum:
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.It looks like the UFO has a rib spacing (stringer spacing) of about 300mm, for an aircraft of the UFO’s performance I recon that you... -
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.A more stable vortex would form on that planform if the sweep from the nose to the false spar was less than the sweep from the false...
-
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.I really don’t understand why a circular or eliptical wing would be any more difficult to build than a diamond shaped wing, a...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.If the mission is to build a successful small LAR airplane that can operate in and out of a small field the formula is fairly simple. 1...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.My experiments with LAR indicates that to perform well they need a very low wing loading, you can compensate with power but increased...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.I was replying to bi_dg who's post advocated scaling up a couple of RC pure deltas. I did say that these types are not the subject of...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.Dyke did design and build a single seat “Stingray”, it was of wood construction and flew for many years before being consigned to a...
-
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.For a very light LAR the planform is important, a pure delta or a double delta as you have shown are not the best, the double deltas...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.I built a couple of “Drifters”, and as Matthew said, their performance varies, I found the glide to be approx 8 - 12: 1. If you observe...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.David Rowe reported that the power off glide of one of his UFOs was “about the same as a Drifter”. As far as using a rectangular centre...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.Charles Zimmerman‘s original quest was to investigate the effect of span (aspect ratio) on wings with a Clark Y airfoil. His wind tunnel...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.there is no washout, it only appears so because the disk is flat bottomed And the chord line is greater for the wider chord inner ribs.
-
-
rotax618 replied to the thread Inverting a G13bb.A 4 bearing 3 cyl or 5 bearing 4 cyl crank should be strong enough if driven off the flywheel end, provided they are not fitted to an...
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.A LAR is not a plank and has a much larger “tail volume”. You can see the the small amount of reflex in the UFO.
-
-
rotax618 replied to the thread Low aspect ratio sport plane ideas.This may shed some light on the advantages of various planforms for a LAR wing. https://apps.dtic.mil/sti/pdfs/ADA397533.pdf
