RE: [RCSE] RE: Inverted Dihedral
There has got to be more to it than just ground or surface effect. Swallows use significant anhedral for ANY non flapping glide, ESPECIALLY when circling in thermal lift or making a pass in front of a lifty slope. For them it is clearly 'best glide', and they always use it to some degree when not powered (flapping). In extended glides or when its really obvious that they're trying to climb in lift, the pose gets even more exaggerated. There is fairly significant sweep to the wings in this mode. Thoughts anyone? Lift, Scobie in Seattle -Original Message- From: Brett Jaffee [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 22, 2000 11:09 AM To: Rodger Hamer Cc: [EMAIL PROTECTED] Subject: Re: [RCSE] RE: Inverted Dihedral Possibly to enhance the ground effect as they come in low? I've seen video of a 2 person ground effect vehicle that had a similar wing tip down look. Rodger Hamer wrote: I was wondering about the fact that when ducks are on final, they always seem to have their wingtips curved downwards...possibly as an airbrake and to avoid tip vortices and wingtip stall? Gulls also seem to assume that flying configuration. Rodger - Original Message - From: "Ciurpita, Greg" [EMAIL PROTECTED] To: "'RCSE'" [EMAIL PROTECTED] Sent: Wednesday, March 22, 2000 7:25 AM Subject: [RCSE] RE: Forward sweep (stability) Ignoring the practicalities ... From Simons' "Sweep forward actually aids control at low speeds, delaying wing tip stall RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Re: Ducks anhedral
Pelicans have their act together. They watch where their going and don't bump into things like Seagulls do. I think a really good floater design should be named after one of them. Forgive them Mike for they are ignorant. Either that or they forget real fast. Randy RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Inverted V-tails
And makes spot landings a bear! * Len Revelle[EMAIL PROTECTED] N9IJ [EMAIL PROTECTED] AMA 60055 http://user.mc.net/~lenrev * - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Wednesday, March 22, 2000 07:39 AM Subject: [RCSE] Inverted V-tails I have noticed a lot of high performance research aircraft (suck as the model that recently flew across the Atlantic) use an inverted V-tail. I remember reading somewhere the advantages of this configuration, but that information fails me at the moment. I assume the is an increase in effiency due to the end plate effect. I seem to remember there is a reduction in adverse roll coupling. Is there anything else that makes this configuration desireable? And yes, it does look cool too... Kristopher RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Turkey Vulture WingspanWeight
A few nights ago there was an incredible documentaty on PBS Nature program about Eagles. It documented all types of eagles from around the world. The upclose film footage of these birds inflight was amazing. The constant camber and planform changing, as well tail movement really gives an appreciation of how these birds are working the air. I am going to start looking at local listings for a re-braodcast. This one is definitely worth taping. I believe the heaviest eagles weigh more than 20 lbs. If anyone has any more info about this program or knows when next it will be aired, please post the info on the exchange. It it a must see! Gavin RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] RE: Inverted Dihedral
Scobie Puchtler or Sarah Felstiner wrote: There has got to be more to it than just ground or surface effect. Swallows use significant anhedral for ANY non flapping glide... There is fairly significant sweep to the wings in this mode. It maybe to neutralize the dihedral effect of the wing sweep. 3* of wing sweep is about equal to 1* of dihedral. If the wing is swept 40* that's an effective dihedral of 13*. If they have 13* of anhedral the two would cancel each other out. Rich Border RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Team MPX!!!
Karlton wrote: "Larry Jolly is now a MULTIPLEX sponsored Pilot!" Ok, ok, I give! I'll be HAPPY to become a Multiplex sponsored pilot! :) (Hope karlton's wearing his good-humor face!) -Les Grammer NWSS (with a smile!) Team Phugoid Member...oh so close! RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] MPEG quality
Some time back someone posted an URL to a MPEG showing a midair between a F3J glider (?) and a human paraglider (both lived to see another day). What impressed me was the picture quality - usually MPEGs are jerky and have a lot of fuzziness built-in, but not this flick :-)! Real bad example was that MPEG of someone DS-ing at Parker, taken by a German, I believe! Sometimes the aircraft dissolves in the 'noise' and never is it anywhere as sharp as the midair! I think all who dabbles in converting film or videp to MPEGs would love to know what equipment was used, at what settings, et cetera! Thank you, whoever it was who did that super midair flick! yours, Tord, Sweden -- If reply difficulties - use [EMAIL PROTECTED] Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] mini-ellipse power plant ?
Hi, I'm looking at power plant options for the mini-ellipse from Jaro Muller. I'm looking to get a good fast climb out of the model, If anybody out there has some experience with different power plants in the model they'd like to share, I'd really appreciate it Actually, I'd appreciate any info at all on how the model flys (speed, climb, thermal ability etc)! Cheers, Tom. ps. sorry is this is a repeat, I had some address issues... -- "The nicer an airplane looks, the better it flies. " http://www.tommywatson.com [work: [EMAIL PROTECTED]] [play: [EMAIL PROTECTED]] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
