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Re: scales for weight and balance work
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Skuller _
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Oct 19, 2009 07:40 PDT
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I used to look for about 15% of the wing chord from the leading edge... It usually meant there wouldn't be too many surprises (talkin' RC here). If you wanted to have an exteremly 'FUN' aircraft to fly, you'd move the CG aft. Inverted and regular spins would be WAY easier to perform. (I assume it made the aircraft MORE unstable) A lesson there, I think. Any model with a forward CG would still fly, but it would not be nearly so responsive. I always thought training aircraft should be as stable as possible. But Aerobatic RC aircraft are a blast to fly.
But then, a crash with RC models aren't usually terminal!
----- Original Message -----
From: Robert E Cook <twocool-@juno.com>
Date: Monday, October 19, 2009 5:56 am
Subject: Re: FFP scales for weight and balance work
| | Gary.......... > > > Cool! This is the way we always checked CG on our model > airplanes......literally supporting them to determine the exact > balancepoint........No scales, no math....extremely accurate! > > I guess the 101 is light enough to be able to actually lift the > aircraftonto some support, and do the same. Since the balance is > at the Landing > Gear attach point, there is enough structure to support all the weight > without damage to the airframe. > > Note also that in this set up, there is no "range" of CG given, > just a > "point"............nice........ > > The CG would of course vary as fuel is used, and then you would > have to > do some checks for pilots of different weights.... > > > Cookie > > > > >
On Sun, 18 Oct 2009 17:59:24 -0700 (PDT) Gary Lee > <gray-@pacbell.net>writes: > Greetings listers, > I know little about aircraft building practices , am mostly > inexperiencedas an aviator, but, being a bit of a pack rat > collector I have in my > posession a copy of a safety bulletin/ advisory circular sent to > me from > the folks at South Webster Ohio, stamped by the USPS on the 3rd > of Nov > 1983, addressing, among other issues the center of gravity > location for > the plane I was building at that time, the 101. For the sake of > historyand general interest in the topic, thought I'd post the > following. Of > course, this information will not apply directly to current projects, > however..... > From the bulletin, I quote: > 1. Center of Gravity Location.
The CG. point on your FP-101 is the rear landing gear attach > fitting. The > center of gravity is determined by balancing the aircraft at this > pointwith the fuel tank empty and the pilot on board and all other > equipmentused in flight installed. The aircraft should balance > fore and aft on > this point with the pilot sitting upright in the flight position > with his > feet on the rudder pedals. If the pilot pulls his legs up and > leans back, > the aircraft should become tail heavy, and if he extends his legs and > leans forward, the aircraft should become nose heavy. Use weights, if > necessary ( the battery is a perfect weight if electric start is > installed) to obtain this condition. Following this proceedure will > insure that the aircraft will have a slight nose heavy condition > when the
fuel tank is filled. Do not attempt to fly a tail heavy aircraft!! > Thiscondition is dangerous because it greatly increases the stall > speed and > reduces the top speed of the aircraft. An extreme nose heavy condition > can result in a tendancy to spiral dive and poor control response > or loss > of control. > Anyway, thought some might find the message enjoyable. > Cheers, > Gary > one wing and all the rest to go. > > > > > > > > From: Geoffrey & Paula West <harm-@sbcglobal.net> > To: Fish-@topica.com > Sent: Sunday, October 18, 2009 1:44:22 PM > Subject: Re: FFP scales for weight and balance work > > I guess what the real "crux" of the entire scale argument would be it > ...go ahead and use whatever set of scales you want. It would help > GREATLY if ...
1- They were consitant > 2- They were acurate > > So, experiment away. Geoff 426NH > > --- On Sat, 10/17/09, Airplane Girl <agflie-@yahoo.com> wrote: > > > From: Airplane Girl <agflie-@yahoo.com> > Subject: Re: FFP scales for weight and balance work > To: Fish-@topica.com > Date: Saturday, October 17, 2009, 6:52 AM > > > Hey.................. > Back to weighing in > (tongue-in-cheek:-)).................................... on the > lighterside of things......... > > I asked the "Flying Farmer" about all this W & B business and he says, > "Heck, if you're building an experimental aircraft use experimental > scales!" (just kidding folks) LOL > > Staying "blond" in VA. > > ..... lurking and learning.......... from the best........... (it has
been great to see/hear the banter and to hear from all sides) > > > For some, a goal becomes a dream and a dream makes life worth > living. > "There is more to life than being a passenger." From Movie Trailer, > Amelia > LMS > KG4WJI > Celebrity Biplane Builder > Aeronca Champ Pilot, N83436 > www.bluebirdaerodrome.com > > > --- On Sat, 10/17/09, Robert E Cook <twocool-@juno.com> wrote: > > > From: Robert E Cook <twocool-@juno.com> > Subject: Re: FFP scales for weight and balance work > To: Fish-@topica.com > Cc: Fish-@topica.com > Date: Saturday, October 17, 2009, 9:20 AM > > > ? > Joe, > > I hope you don't mind changing the subject to a new discussion > (argument)........(Complete with sarcasm) lol.... >
I'm going to start out with a couple of questions........ > > On your "moth".............. > > What is V ne ? > What is Va ? > What is the wing loading ? > > What is your entry speed for a loop? > What is the exit speed? > > What is the entry speed for an Immelman? > What is the exit speed? > > > Cookie > > > > > Stalls, spins, loops, hammerheads, wing overs, and immelmans are > easy. > Best of luck to you. > Joe Hutton, > Tiger moth TM-28, 300 hours > PS My 95% P-51D is taking shape and coming along great!!!! > > > > ____________________________________________________________ > Turn any room into a work of art. Click now for beautiful oriental > rugs! > > > : > Find a Fishnet member near you at
House Rescue Bill Passed > $133,000 mortgage under $679/mo. Compare rates and save! > http://thirdpartyoffers.juno.com/TGL2141/c?cp=YEcVHlD0xYMpAxTxcMI2uQAAJ1DjV1tSDmoS7TARU8dR_hVpAAQAAAAFAAAAAN3uLj8AAAMlAAAAAAAAAAAAAAAAAAaTcQAAAAA= >
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