Finally got a tuck so now it's really done. I don't know where the actual CG is (a friend of mine barrowed my CG machine) but when I removed enough weight to get to 60¾ oz, trimmed it for level flight and put it into a dive test it got a mild tuck. I put a ¼ oz back in, added 3 clicks of up elevator and tried it again. Perfect. My starting weight with the Supra balanced at 92mm was 62¾ oz and my finish weight, with a total of 1 ¾ oz removed from the nose is 61 oz even. That moved the CG back enough that I had to move the tow-hook back as well because it was now to far in front of the new rearward CG location to give a good rotation on launch. I'm still amazed at how quick this plane can be at such a low weight (8.2 oz wing loading)
Maurice. --- In [EMAIL PROTECTED], "Maurice Podder" <[EMAIL PROTECTED]> wrote: > > >I had to add 4 1/2 oz of lead to the nose (using the Kennedy 1200 > mil battery pack) to reach Dr. Drelas recommended CG of 91.5mm.< > > Just got back from a good morning of flying the new Kennedy Supra. > Did lots of dive and inverted flight tests. By the end of the > morning I had removed 1 5/8 oz. from the nose and still had not seen > a solid tuck. So right now I'm down to 61 1/4 oz. from 62 3/4 and > may be able to take out a little more. BTW: all dive and inverted > tests are done in thermal mode (2deg pos.). And the dive test is > done at an angle greater that 60 deg and from a high enough altitude > to insure the stab is in control of the planes attitude. > > When I started the tests the plane flew very well but was very fast, > in thermal mode and immediately went nose down when put into reflex. > Now that the weight has been removed (CG moved aft a lot) and the > plane re-trimmed it flies slow to very slow (camber applied) in > thermal mode and has very good speed in reflex. > > I still have a lot to learn about the Supra's flight characteristics > but even at this initial point I'm very happy with it. > > If you have any suggestion about the Supra please let me know. > > Still looking for the tuck > Maurice > > > --- In [EMAIL PROTECTED], "Maurice Podder" <[EMAIL PROTECTED]> > wrote: > > > > Hi All > > > > I finished my Kennedy Supra last night. It went together really > nice. If > > the fog clears and it doesn't rain I'll fly it today. I was > hoping for 61 > > to 62 oz but came out a little heavier at 62 3/4 even though I was > very > > careful with glue and install. What really surprised me was I had > to add 4 > > 1/2 oz of lead to the nose (using the Kennedy 1200 mil battery > pack) to > > reach Dr. Drelas recommended CG of 91.5mm. Actually set it at > 92mm. I'm > > hoping when I fly the plane that I will be able to take some of > that nose > > weight out. I like a rearward CG anyway. > > > > I'll let you know how the first flights go > > > > Maurice > > RCSE-List facilities provided by Model Airplane News. > Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > Please note that subscribe and unsubscribe messages must be sent in > text only format with MIME turned off. Email sent from web based > email such as Hotmail and AOL are generally NOT in text format > > > > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
