I believe that he can do it...with a LOT of work. But I also found that I converted to Troy ounces, not "normal" ounces by mistake. That adds another .7 oz or so...plenty to make up the difference! His is also a hollow molded wing, so I can see where the weight savings can come from...but you have to be REALLY good to get it! Jason ----- Original Message ----- From: "ScrollSander" <[EMAIL PROTECTED]> To: "Jason Werner" <[EMAIL PROTECTED]>; "RCSE" <[EMAIL PROTECTED]> Sent: Wednesday, April 04, 2001 11:23 PM Subject: Re: Calculating expected weights > Hi Jason, > > When I was building my Itch micros I had the same question. When I tried to > lay up dryer fuses, drier wing bagging, and skimp on all the rest, it all > came down to the Blue foam I was using. If you decrease the wing area, you > loose a little in the glass/resin covering but the main thing is a loss in > the volume of the blue foam. this also is helped by thinner wing sections > while retaining the same chord. The question gets down to durability and > flutter. Careful use of glass skins on the wings, like 2 layers from the > highpoint forward where you can take advantage of the section thickness to > add to rigidity, and a thin layer in the back, much like a built up wing, > can save alot. The lightness can be done, but I wonder about the full blown > launches. > > You already know all this, and besides, Wolfgang is a good builder. > > Chris Adams > > > > ----- Original Message ----- > From: "Jason Werner" <[EMAIL PROTECTED]> > To: "RCSE" <[EMAIL PROTECTED]> > Sent: Wednesday, April 04, 2001 9:38 AM > Subject: Re: [RCSE] Wolfgang Zachs SAL > > > > 230 grams - 7.39 oz. 190gms = 6.1 oz. > > > > The reported weight is 6.1 to 7.39 oz. The average weight is 7.3oz, but > > they claim 6.1 is possible with 4 servos. Depends on the servos I guess > (WT > > 3.9g servos?) > > > > But this is possible since the setup is similar to DJ Aerotech with a > fairly > > small chord compared to some of hte older designs. Not as radical, but > > smaller. Their open class stuff is similar with I believe an 9 in chord > on > > a 4+ meter plane! Whew! Anyway, less structure = less weight. > > > > I figured that with 2 layers of 1.5 oz glass, some carbon prepreg (.014), > > .5oz resin, and the core (1/32 balsa) you could get around 4.5 oz for a > > PERFECT structure (i.e. totally on edge with no excess anywhere!). So I > > would question the 6.1 oz with full gear, but the 7.3 is possible. > > > > Jason Werner > > > > ----- Original Message ----- > > From: "John Erickson" <[EMAIL PROTECTED]> > > To: "Werner Stark" <[EMAIL PROTECTED]>; "Soaring List" > > <[EMAIL PROTECTED]> > > Sent: Wednesday, April 04, 2001 12:23 PM > > Subject: Re: [RCSE] Wolfgang Zachs SAL > > > > > > > This plane looks beautiful! Is it really 6.6 oz with 4 servos? (190 g) > > > Maybe this is the dry weight. My German is rusty. > > > > > > JE > > > -- > > > Erickson Architects > > > John R. Erickson, AIA > > > > > > > > > > From: Werner Stark <[EMAIL PROTECTED]> > > > > Date: Wed, 04 Apr 2001 15:26:25 +0200 > > > > To: RCSE <[EMAIL PROTECTED]> > > > > Subject: [RCSE] Wolfgang Zachs SAL > > > > > > > > www.pcm.at > > > > > > 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]
