RE: Stuck Choke
[quote]ORIGINAL: rcnats Can the choke rod be removed? [/quote] Yes. The heat deformed the aluminum body somehow. Try heating the body with a heat gun or in the oven. Check the schematic:
Posted on: 8/3/2012 7:03 AM by Author "Lnewqban" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11179526

RE: Transmitter Resolution - What Does It Mean?
Check these links out: http://wiki.openpilot.org/display/Doc/RC+Transmitter,+Receiver+and+Servos http://www.futabarc.com/faq/product-faq.html
Posted on: 8/3/2012 6:53 AM by Author "Lnewqban" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=11179514

RE: CG On flying wing?
[quote]ORIGINAL: sagehillspilot How do you find the CG On a flying wing?? [/quote] This is why and how: http://adamone.rchomepage.com/index5.htm
Posted on: 7/31/2012 9:03 PM by Author "Lnewqban" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=11176744

RE: Finding the COG?
I would add to the above post that, for combustion engines, the measurement of the balance point should be done for the condition at which the plane will be most tail heavy. As fuel is consumed during flight, the CG will move aft for a conventional model. There is certain point for the CG behind which the plane becomes unstable (known as tail-heavy). In order to ensure that that point is never reached when the tank gets empty, those models are balanced with empty tanks. At the beginning of each fly they will be nose-heavy, which is not ideal, but always better than ending up with a tail-heavy and uncontrollable model by the end of the flight. All the above applies in reverse for models that have the tank aft the CG: they should be balance with a full tank.
Posted on: 7/30/2012 11:10 AM by Author "Lnewqban" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=11174651

RE: Wind speed limits?
Just a reference: http://www.youtube.com/watch?v=Oix6sHKzOLU&feature=related
Posted on: 7/18/2012 10:31 AM by Author "Lnewqban" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=11159999

RE: engine modification
I see no problem in doing what you explain. File it rather than sanding it. Common practice is keeping minimum the diameter of the hole from the edge to the center of the hole; but if there is room for the head of the bolt or the nut and some washer, just go ahead with your idea. Best !
Posted on: 7/11/2012 7:02 PM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11151995

RE: Modifying Stabilizer Incidence
[quote]ORIGINAL: georgebonn ......The builder of the plane seems to have been a very fastidious craftsman. He died a few years ago. I bought the plane from a local very small basement shop RC flyer/shop operator. He bought it from the guy's widow. With the plane I received the original box, construction manual and plans, all of which had copious builder's notes. He added brakes, lights, gyro, glow driver and high-end servos. For some reason, he intentionally increased the incidences to 6 degrees. [/quote] I would trust that gentleman's modifications to the plane; it seems that he knew what he was doing.
Posted on: 7/10/2012 7:35 AM by Author "Lnewqban" in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=11149890

RE: Modifying Stabilizer Incidence
[quote]ORIGINAL: eddieC [quote]Isn't ''decalage'' usually defined as the difference between the <a target=''_blank'' rel=''nofollow'' href=''http://www.rcuniverse.com/buynow/keywordclick.cfm?bid_id=6986'' title=''Use your PC to perfectly set engine thrust angle, wing incidence, decalage and control throws'' style=''BORDER-BOTTOM: black 1px dashed; BACKGROUND-COLOR: transparent; COLOR: black; TEXT-DECORATION: none''><font color=''#000000''>angle of attack of the wing and the stabilizer?  [/quote] Close. Originally, was the difference in angles for biplane wings.<a href=''http://en.wikipedia.org/wiki/Decalage''> http://en.wikipedia.org/wiki/Decalage [/quote] Decalage is a French word that means displacement of two temperatures or measurements; also absence of concordance between two things. Hence, it can be used in both cases, where two angles diverge. I would like to add to the above discussion that stabs fly within the downwash produced by the wing (not for canard layouts); therefore, they normally have negative AOA (producing negative lift that compensates for wing's pitch moment), even when the incidence angle is set as neutral.
Posted on: 7/10/2012 7:24 AM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11149883

RE: Modifying Stabilizer Incidence
[quote]ORIGINAL: georgebonn Surprisingly, the datum line is not shown on the plans and I could not find it on the GP's website. My understanding is that all aircraft's datum lines are drawn from the centre of the propeller to the bottom of the stabilizer. Is this not correct ? [/quote] http://en.wikipedia.org/wiki/Angle_of_incidence If both angles are equal, then, the airplane has the proper incidence angles and zero decalage (difference between incidence angle of the wing and tail). In engineering and drafting, a datum (the singular form of data) is an[b] arbitrary[/b] reference point, surface, or axis on an object against which measurements are made.
Posted on: 7/7/2012 11:19 PM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11147170

RE: Help me ID this plane please.
Original dimensions: Length: 6.83 m (22 ft 5 in) Wingspan: 7.80 m (25 ft 7 in) http://en.wikipedia.org/wiki/Sukhoi_Su-26 Length scale: 76" / ((22*12)+5) in = 0.28 = 28% Wingspan scale: 89" / ((25*12)+7) = 0.29 = 29% http://www.wildharerc.com/downloads/documents/Sukhoi-87-fb.pdf http://www.wildharerc.com/
Posted on: 7/5/2012 7:36 PM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11144711

RE: Glow Engine Question - Why does the Propeller threads loosen the same direction the engine runs?
[quote]ORIGINAL: gregoryshock ........My dad has always felt that it should be left hand threads so that the propeller would tighten it's self, instead of loosing it's self..... [/quote] Regardless the direction of the threads, the nut produces a strong axial force, which induces friction between the drive washer and the propeller. Is that friction what prevents the propeller to rotate respect to the shaft in either direction. The torque of your hand during starting is much smaller than that friction. The torque of the engine or motor is smaller than that friction but bigger than the torque of your hand. The engineers decided to help the nut resisting the biggest of both forces (torque of the engine or motor) by tending to tighten itself in the direction that is contrary to the direction of that force.
Posted on: 7/5/2012 7:18 PM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11144686

RE: Building Enforcer - curious about mods
[quote]ORIGINAL: ser00 I do not know if the CG is moved forward because of the weight of the ducted fan in the back or if it is do to aerodynamic forces and increased surface area (more lifting body) due to the six additional inches of fuselage and canards? [/quote] I agree with previous poster and your modification to the airplane will be correct. The location of the CG depends on the lifting surfaces (including the canard wing) and their areas and distances between them. The weight of the ducted fan or your tail engine has no effect over that CG location, only on how much counter weight you will need to add or remove from the nose. In the sticky forum of the Aerodynamics section you can find an on-line calculator that is specific for canards. I copy it here as well: http://adamone.rchomepage.com/cg_canard.htm
Posted on: 6/10/2012 7:10 AM by Author "Lnewqban" in the forum "Kit Building"
http://www.rcuniverse.com/forum/fb.asp?m=11113131

RE: enjine side-thrust
Could you explain your question better? [color=#0000CC]"Into what times should engine side thrust be made?"[/color] is very confusing. Are you asking the angle for the thrust line of the engine when you look the airplane from above? Information on type of airplane will help.
Posted on: 6/10/2012 6:58 AM by Author "Lnewqban" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=11113114

RE: Rebuilding Tail Surfaces
I agree with previous poster. If you want to taper balsa, using sandpaper block or planer, here is how: http://www.charlesriverrc.org/articles/construction/markdrela_airfoilshaping.pdf If you want to reduce the thickness, you can sand the flat piece on a flat surface and between two pieces of music wire of 3/16" diameter.
Posted on: 6/10/2012 6:52 AM by Author "Lnewqban" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=11113110

RE: first flight
[quote]ORIGINAL: CGRetired It was funny but it really humbled me a tad cuz, after all, I had all that experience... [8|] [:D] [/quote] A++ Experts believe that they know it all and hence, they stop learning. Real learners stay humble, keep asking questions and helping others with what they know (the best way to learn), thus becoming real good builders and pilots. [quote]ORIGINAL: 52larry52 Congratulations T-MAX97, you did a fine job today .......................... And yes, he went home with a smile and an intact airplane!! (That made us smile too!) [/quote] Real noble post, 52larry52!!
Posted on: 6/10/2012 6:33 AM by Author "Lnewqban" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=11113093

RE: Flaps or Spoilers ? Radian
In my opinion, they are effective regardless of their location along the chord. The principle of spoiling the top airflow and resulting lift is the same. Note that the airliners use the hinged type and they are located right forward of the flaps. http://en.wikipedia.org/wiki/Spoiler_%28aeronautics%29 The location of the guillotine type used by RC models is more practical by the thicker portion of the chord.
Posted on: 6/9/2012 6:01 PM by Author "Lnewqban" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=11112699

RE: first flight
I am sure that your knees were shaking during the flight and that your smile was big after landing. Just keep practicing flying in the wind. Best!
Posted on: 6/9/2012 5:45 PM by Author "Lnewqban" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=11112687

RE: cant believe it!
Any machine shop could fabricate one aluminum tube with those dimensions from a tube of bigger exterior diameter and heavy duty walls.
Posted on: 6/9/2012 5:42 PM by Author "Lnewqban" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11112683

RE: cant believe it!
I would ask for replacement under warranty.
Posted on: 6/8/2012 9:06 PM by Author "Lnewqban" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11111928

RE: Ring cooked unto piston
[quote]ORIGINAL: Cajuncharley I know if I keep fooling with it, I will ultimately break the ring. Is there a special technique to removing such a stuck ring? [/quote] If the groove is melted or deformed in some sections, it may make a new ring useless. I would send the piston to Frank Bowman for evaluation and adjustment of a new ring. The removal difficulty depends on what holds the old ring, the aluminum of the piston or just carbon-oil. You could try some cycles of heating and cooling in the oven and then soaking it in a mix of 50% automatic transmission fluid and 50% Marvel oil. Best!
Posted on: 6/8/2012 9:05 PM by Author "Lnewqban" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11111923

RE: Flaps or Spoilers ? Radian
What do you want to achieve, Roger? I am not familiar with your plane, but you can consider the following: Spoilers kill lift and have some brake action, introducing little pitch reaction. Flaps increase lift and have some brake action, introducing some pitch reaction that need to be compensated with elevator. If you are adding the surfaces aft the trailing edge, you are increasing the area (20 sqin) and lift of the wings.
Posted on: 6/8/2012 8:50 PM by Author "Lnewqban" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=11111913

RE: Hi Everyone
Thanks; it sounds complicated to me. These two links may help your first steps as a model builder: http://www.easybuiltmodels.com/tips.htm http://www.airfieldmodels.com/site_map.htm Best!
Posted on: 6/4/2012 3:24 PM by Author "Lnewqban" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=11106327

RE: Hi Everyone
Very welcome to the site, Erik! What embedded systems are?
Posted on: 6/4/2012 3:02 PM by Author "Lnewqban" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=11106288

RE: Mud Flaps
Very good solution. Link to your videos?
Posted on: 6/2/2012 4:46 PM by Author "Lnewqban" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=11104083

RE: Silly question about tissue paper covering
Welcome to the site! No sanding of overlaps. Check the articles which names start with Tissue: http://www.pensacolafreeflight.org/page5/page5.html
Posted on: 6/1/2012 10:30 AM by Author "Lnewqban" in the forum "Kit Building"
http://www.rcuniverse.com/forum/fb.asp?m=11102601

RE: fabricating Fowler flap parts
[quote]ORIGINAL: McYondan ...  How in the would could I fabricate this from say square, tapered or trailing edge balsa stock? [/quote] What about using a wood shape copied from either matching sides with heavy sandpaper glued onto it? Preparing some sanding guides could improve the precision. Now, if the part is tapered, you have a more complex problem. These articles may help you: http://www.charlesriverrc.org/articles/construction/markdrela_airfoilshaping.pdf http://www.charlesriverrc.org/articles/construction/markdrela_improvingsandingaccuracy.htm
Posted on: 6/1/2012 8:14 AM by Author "Lnewqban" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=11102435

RE: All about Gamma (or k if you want)
Check this link: http://en.wikipedia.org/wiki/Speed_of_sound [color=#0000CC][i]"Ganma is the adiabatic index also known as the isentropic expansion factor. It is the ratio of specific heats of a gas at a constant-pressure to a gas at a constant-volume(Cp/Cv), and arises because a classical sound wave induces an adiabatic compression, in which the heat of the compression does not have enough time to escape the pressure pulse, and thus contributes to the pressure induced by the compression."[/i][/color]
Posted on: 5/31/2012 11:38 AM by Author "Lnewqban" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=11101413

RE: A new rogue pilot with questions
[quote]ORIGINAL: Dustin1911 ............ think that I will have any problem flying this plane after flying the Nexstar for a year? [/quote] Welcome to the site, Dustin! No, you will not have any problem flying that airplane as a trainer. Best!
Posted on: 5/30/2012 9:56 AM by Author "Lnewqban" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=11100010

RE: Aircraft Structural Design
pirit4, We are neighbors! So, you have a design and are not sure of its strength? The pure design process is opposite to that. Any fool can design or make a structure strong enough, for anything. The real challenge is to put the minimum amount of mass where and how is needed to the the job. The commercial reason is the saving in material costs. For flying machines, the additional reason is reaching the minimum safe and practical weight. Our models have a complex structure, where the cover and wood work as a team to keep the airplane in a piece under normal stresses. Vibrations and accidental loads alone are very complicated forms of stress. All that makes a pure theoretical design that flies well a rare thing, the design of our models is basically empirical (design-test-re-design-test,....). You could do some pre-flight test, if you have completed the structure, by loading it with the most typical stress of each section. Some general considerations: The whole weight is to be more or less uniformly distributed on the wings; however, violent maneuvers will increase that weight several times. The section between the firewall and wing will feel torsion (prop torque), bending moment (the engine hangs from the supporting wing), tension (thrust). If a tail dragger, that section will feel strong bending forces from the landing gear (vertically and twisting from the resistance to roll). From wing to tail, forces are less and can be considered as bending only. Flying surfaces will try to bend and twist due to lift and controls; for most cases the twisting rigidity is the harder to achieve (in order to avoid flutter). Finally, you have to consider the practicality of the construction process. If you study very old designs, you will find very complicated structures that required very intense labor: the pay-off was always excellent rigidity and strength to weight ratios. If you study SPAD designs, you will see the opposite end of the spectrum. Best!
Posted on: 5/27/2012 8:15 AM by Author "Lnewqban" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=11096167

RE: Pilot 260 balance problem
[quote]ORIGINAL: rmoose iv got one of these ill flying planes madian flight was yesterday falling out in a turn and after 10 trys finally had to set it down in tall grass cg was set at 140 mm pilot said 144mm. terrible flare up on landing throught i was going to loose it every time it leveled out to land  im lucky iv got any thing left to repair broke the carbon fiber gear and pants . no structural damage. hard to belive, iv read about this plane on giant r/c web forms and then called chief and they said  all the proublems were fixed  WRONG ANSWER . it has so far the crapest plane iv flown yet  .can any body out there tell me were the c.g. and the engine trust angle is suspose to be someone who has one of these birds that flys like a  airplane should ! [/quote] rmoose, In my opinion, your problems are in the wing, rather than in the CG or engine thrust angle. The tapered wing is for easy tip stall because it is an aerobatic plane, only that yours has too much of that characteristic. When turning or flaring, you command elevator up, which increases the AOA of the wing. Simply put, the tip sections of the wing are reaching stall quicker than the root and the plane suddenly snaps into a violent roll. Grab your hot air gun and twist the tips of the wing in a way that the TE goes higher than the LE, introducing all the wash out that you can. Then, grab an incidence meter and verify all the incidences, as others have suggested, correcting whatever you need to have symmetry and washout. Go flying and report back, please.
Posted on: 5/27/2012 7:43 AM by Author "Lnewqban" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=11096139