[RCSE] HLG launch preset on Profi 3030
To other 3030 owners: I'm trying to set up a HLG preset on a momentary switch on my 3030. The obvious approach is FIX.VAL, but unfortunately neither elevator or rudder has the FIX.VAL attribute. It appears I can use AUX channels instead of elevator and rudder (since AUX channels *do* have FIX.VAL), but I'm hoping there's an easier way that I overlooked. In my case, I only want elevator preset (it's a javelin-launched plane), and it's got a v-tail which makes using the AUX channels a little more painful, since I need to create a custom mixer. Anybody got a solution other than custom mixers? Dave Johnson RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] HLG Launch
Dick Barker wrote: No! No! You got it all wrong. One day of f3b and six days of hlg is more like it. Would make people appreciate low stress hlg launches. -- Dick Barker Dick, Quit getting yourself all twisted up in knots over how people launch thier HL gliders. .. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] HLG launch Tx presets
Ah, but that's where the multi-point mixing comes in handy. Simply program the elevator offset in the single point where the flap stick is at the top of its travel, then all one has to do is move it down off that point (and granted, to or past the next point, but that's a very short throw) at launch. Discrete positioning not required, just somewhere near mid-range. Easy to do this and quite consistent using your thumb at the base of the stick. Personal preference, but I would think that the gear switch location is harder to effectively and quickly reach/operate. I'm also disappointed that a radio in the 8103's price range doesn't offer the flexibility of assigning such obviously popular functionality to the existing spring-loaded switch in Glider Mode. - Original Message - From: "Tom Hoopes" [EMAIL PROTECTED] To: "Tom Watson" [EMAIL PROTECTED]; "Bill Harris" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Monday, August 21, 2000 8:03 PM Subject: Re: [RCSE] HLG launch Tx presets The advantage of a HLG preset switch (spring loaded) allows for positive actuation and predictable elevator offset when preparing to launch, especially during critical tasks such as flying a ladder format. Positive elimination of launch preset is just as critical to insure an effective climbout and subsequent bunt (round over). I have found that discrete stick positions are hard to repeat for this function, especially during a vigorous launch. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] HLG Launch height
Sorry about the very delayed response on this one, I've been away from my email for quite some time now. The now old launch height thread kind of reminds me of the early threads on DS. I remember the initial posts that I got in response to my first DS posts. Most of which had comments that were disbelieving, uncertain, or showed a lack of the underlying physical realities. I'm seeing the same trend with the HLG heights. A few years ago, I did a HLG launch simulation to better understand the underlying mechanics. My results indicated that in calm air I should be able to get about 70 feet of altitude, and with 20 ft/sec of wind, I should get about 100 feet. This is assuming an 80 ft/sec throw speed, wind tunnel airfoil data, and a standard build up for the remaining drag elements. The 80 ft/sec initial throw speed was a number that I estimated based on a good softball throw, and other SWAGs. It turned out to be fairly accurate, as two different radar guns have consistently clocked me at 50 to 55 mph. Another comment, the better HLGs out there at present have minimum sink values in the 1 ft/sec range, at least based on analysis using the wind tunnel, as well as the predicted, airfoil performance. This is consistent with the 1:10 to 1:15 "dead" air hang times that have been recorded, if one assumes the ~70 feet initial launch altitude. An interesting trade here is to add drag to the airframe to bring the calm air launch height down to the only 40' - 50' "claimed" possible. I had to triple the total profile drag to get down to 50'. To achieve only 40', the drag had to go to 5x the wind tunnel + build-up profile drag. One more comment on the laser range finder toy. It, by itself, seems to be quite accurate. It seems to agree very well with our previously hand-measured 145 m F3J lines. And, I know of other applications that use them repeatably and reliably. So, I'm pretty confident of their absolute range readings. Whether there is a slant range component is up to the users capability to figure out what is vertical. I'm not too worried, as 15 degrees of vertical error (a lot), only shows a 3.5% absolute altitude error. This is about the scatter error that we noted when throwing in stable air, although the scatter was undoubtedly due to variations in the individual throws. Joe Wurts PS and BTW, If you cannot do at least two or more loops after a throw around the power lines on the west of the Visalia field, I would recommend getting into tip launch, as your conventional launch is not up to par. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] HLG Launch height
I look forward to seeing the launches and loops at Visalia this year. You always amaze me. Chris Adams RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] HLG launch questions
Yes, modern hlgs will take the stress of a javelin run up toss and that is what most people are using. Launch speeds are in the 70 plus feet per sec range. A bad throw can do wing damage if you hang on too long and pull down or if you bounce up during the run. My discus style launch is by definition at zero Cl and is pretty easy on the wing but very stressful on the pod, boom and tail feathers. -- Dick Barker Seattle, WA - The Old Fart Glider Flyer - Walter wrote: Do these planes have the strength to with stand that type of launch... RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] HLG launch profile
Hi there. I've been flying my first HLG recently, and have not been around anyone else who flies HLG. So, I haven't been learning by watching. That's where I need help. My launches are of the following variety: (1) high launch that doesn't seem to transition quite right (drops about 40% of the height from the apex), (2) low launch that keeps up the speed and doesn't lose height at the apex, and (3) fast launch (at a low angle) that rises quickly but still has some of the problems seen with 1 and 2. So, what is the best profile? I seem to cover a lot of ground with the lower launches, but would love to be able to keep all of that altitude that I lose with the high launch (very depressing to see the plane drop that big chunk all at once). Easy fixes? -David ps - hand launch IS addictive pps - I was sore for 4 days after my first half-hour of flying RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
