RE: oly 2 spoilers
[quote]ORIGINAL: bigstick60 anybody know what is the correct deflections or throws for the oly 2, 100 inch wing span spoilers? 90,45 degrees? first glider i built using spoilers, never heard any one say much about what works thanks [/quote] These are set up for 90 deg, but 45 would work for killing lift. The only difference would be the amount of drag produced by the differing areas exposed to the breeze.... In theory, the 90 degree version would produce approximately 30% more drag than the 45 degree setup. These are rigged with a single fuselage mounted servo and a pull cord, with self adhesive weights on the spoiler blades to keep the installation simple, light and cheap... Cheers! Jim
Posted on: 9/29/2007 5:11 PM by Author "Jimmbbo" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=6429057

RE: Engine Test Stand
[quote]ORIGINAL: opjose [quote]ORIGINAL: Jimmbbo Built this one that can be clamped to WorkMate or picnic bench... light, cheap, small... My kind of stand... Cheers! [/quote] That looks identical to mine. I added a "keel", a block of wood that affixes to the underside very securly, which I merely clamp into the Workmate's built in divided center. [/quote] Good idea!
Posted on: 9/23/2007 5:02 PM by Author "Jimmbbo" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=6404431

RE: Control line crash/video
[quote]ORIGINAL: Phlip Remember, down is up and up is down ... [/quote] Glad I never did that [sm=biggrin.gif]
Posted on: 9/16/2007 10:19 PM by Author "Jimmbbo" in the forum "Crash & Rebuild"
http://www.rcuniverse.com/forum/fb.asp?m=6376904

RE: How weight effects speed
[quote]ORIGINAL: Cambo Still doesn't make sence to me. Wouldn't the angle of attack be the same with both planes in level flight? Maybe someone needs to explain what AOA exactly is. I have an idea but am not sure. [/quote] Attaching two drawings - one of a generic lift curve, one showing AOA... Lift (blue line in drawing) increases with AOA until the critical AOA is reached and the wing stalls.... Higher AOA, more lift, but also more drag (red line in drawing). With constant thrust, drag slows the airplane down, so you either live with the slower speed, or increase power and fuel consumption to make up for the loss...
Posted on: 9/3/2007 12:57 AM by Author "Jimmbbo" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=6320515

RE: How weight effects speed
The 15 lb airplane will require a higher angle of attack (AOA) to create the additional 5 lb of lift to maintain level flight. Higher AOA causes an increase in induced drag, slowing the airplane's airspeed... HTH! Jim
Posted on: 9/2/2007 9:51 PM by Author "Jimmbbo" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=6319831

RE: NACA Ducts on my flash
Nice lookin' duck... er, duct ;) From what I know and have observed about NACA ducts (did wind tunnel model design in a former life, and have seen them installed in many FS aircraft), they work best when installed on a surface sloping down into the relative wind, which provides the highest pressure and minimizes separation entering and within the duct... The idea is to give high pressure air on a ramped surface somewhere to go. and the NACA duct inlet provides good pressure utilization with less drag and fewer icing problems than a scoop... Installing them in a decreasing taper location may or may not allow them to work properly... Unable to determine from your installation where the duct is located, but had to add my $.02... Cheers! Jim
Posted on: 8/26/2007 11:54 PM by Author "Jimmbbo" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=6291510

RE: Good aviation books
Two of my favorite books - reread them at about three or four year intervals... [u][i]Fate is the Hunter[/i][/u] by Ernest K. Gann - first person account of Gann's struggle to become an airline pilot and fly DC2s and DC3s with decidedly low tech communication and navigation equipment in the 1930's. The book follows Gann's being drafted as a civilian ferry pilot thru WWII and beyond... Exceptionally well written "you are there" yarn. [i][u]Chickenhawk [/u][/i] by Robert Mason - Outstanding story of helicopter aviation in Vietnam. As real as it was...
Posted on: 8/25/2007 3:26 AM by Author "Jimmbbo" in the forum "The Clubhouse"
http://www.rcuniverse.com/forum/fb.asp?m=6284188

RE: Installing wing tubes
Did these for a GP J3 'cuz wings were too long to fit in my car without re-kitting them ;)
Posted on: 8/10/2007 2:40 AM by Author "Jimmbbo" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=6219476

RE: wing tips
If appearance is not an issue, the most wingtip with the least loss of efficiency is a flat endplate.
Posted on: 8/8/2007 2:20 AM by Author "Jimmbbo" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=6210712

RE: F-86 hinging issue, I'm at a loss here
Hmm... Off the top of my head, seems like a couple of ball end links might work...
Posted on: 8/4/2007 2:24 AM by Author "Jimmbbo" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=6194880

RE: California Spray paint ban?
[quote]ORIGINAL: JPGale [quote]ORIGINAL: Jimmbbo [quote]ORIGINAL: daveopam Having a flame retardent mattress cuts down on the # of Darwin award winners. It also changes nature's "natural selection" process. Seriously though,does your bedding really need to be able to resist an open flame? The sheets,pillows,carpet,clothing and furniture dont. So your paying 20% more for what? David
Posted on: 7/23/2007 3:28 AM by Author "Jimmbbo" in the forum "The Clubhouse"
http://www.rcuniverse.com/forum/fb.asp?m=6144542

RE: California Spray paint ban?
[quote]ORIGINAL: daveopam Having a flame retardent mattress cuts down on the # of Darwin award winners. It also changes nature's "natural selection" process. Seriously though,does your bedding really need to be able to resist an open flame? The sheets,pillows,carpet,clothing and furniture dont. So your paying 20% more for what? David [/quote] WARNING to all sensitive souls who may be offended - politically incorrect rant follows.... We get to pay the additional 20% to allow the pinheads in our nanny-state government to feel good about themselves while ensuring their reelection by populating the state with more Darwin award wannabes...
Posted on: 7/22/2007 1:39 PM by Author "Jimmbbo" in the forum "The Clubhouse"
http://www.rcuniverse.com/forum/fb.asp?m=6141776

RE: Deciding to become a pilot?
Tripower, I concur. I describe airline flying (only somewhat jokingly) as the greatest job you could ever have, and the worst career you could ever choose. Someone actually will PAY me to do what I love to do, and I could be on the street tomorrow due to a number of things I have NO control over... bad business decisions, downturn of the market, terrorist attack, busted checkride or medical... THEN after a decade at my current job, I get to try to find a job at the bottom of another carrier's seniority list (and pay scale)... Definitely NOT for the faint of heart... ;) Cheers! Jim
Posted on: 7/22/2007 4:45 AM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6140948

RE: Coordinated turn ?
[quote]ORIGINAL: B.L.E. The amount of rudder needed for a coordinated turn depends on the bank angle. A 90 degree bank is all elevator. A 45 degree bank is half elevator and half rudder. A 30 degree bank is 86% rudder and 50% elevator. I use the ailerons to set the bank angle and then I use a mix of elevator and rudder to carve the turn. The ailerons should be neutral during the turn. If you have to hold ailerons to stay banked, you are not using enough rudder. If you have to hold opposite ailerons to keep the bank from increasing, you are using too much rudder. [/quote] To add a minor detail to (and completely obfuscate ;) ) the discussion, an airplane will maintain a "neutral aileron" bank of around 17ish degrees depending on its configuration (wingspan, dihedral, high/low wing, etc). At bank angles less than the "neutral aileron bank", the airplane will tend to shallow out due to inherent lateral stability. At bank angles steeper than the "neutral aileron bank", the airplane will tend to increase the bank angle (overbank) requiring opposite aileron to maintain a steeper bank angle. Overbanking is caused by the different turn radii of the two wings. How this works is that a steeper bank angle means a smaller turn radius, and the radial difference between the inboard and outboard wing panels is larger as a percentage of the turn radius... Outboard wing is now flying faster, more lift, overbanking... This probably has limited practical application for model aviaiton but I can go back to my Merlot now... :D Cheers! Jim
Posted on: 7/15/2007 10:03 PM by Author "Jimmbbo" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=6115554

RE: Thermal question
Good points... Something else to consider is whether the air temp today is cooler than it was yesterday... If a cool air mass moves in over relatively warm ground (solar energy absorption is about the same from day to day), you're gonna have an unstable air condition, with thermals rising as the surface heat tries to escape... Conversely, if today is warmer than yesterday, the thermals have less of a reason to go to work... ;) Cheers! Jim
Posted on: 7/15/2007 9:29 PM by Author "Jimmbbo" in the forum "RC Gliders, Sailplanes and Slope Soaring"
http://www.rcuniverse.com/forum/fb.asp?m=6115390

RE: Deciding to become a pilot?
[quote]ORIGINAL: normgoyer Hi Jim, you're preaching to the choir. One of my many current writing assignments is for Plane & Piklot where I do reviews of professional flying schools around the country. I also owned and operated four flying schools in SoCal for about 10 years. The demand for pilots has always been an up and down, good and bad time sort of employment. But at the very top of airlines desired applicants are military trained pilots, mainly because of the large amount of mult engine turbine time they have logged. Also the military has outstanding schools and it is possible to swap a few years of your life for logs filled with flight time. The big problem has always been money for the young folks that want to become professional pilots must pay or their parents. A four year aviation college can cost up to 50 grand and more. Local flight schools like the ones our family ran now cost about 15 to 20 grand for needed certificates and ratings. But that is only the beginning, most airlines want to see some type of advancved degree or logbooks filled with qualifying time. In my opinion, a potential airline pilot should never rule out the military as an excellent source of a flying career. Norm [/quote] Hi, Norm, Agree that airline hiring is extremely cyclical and those cycles are unpredictable, and would add that the trick is hitting the cycle right - I had one friend who was hired by UAL in the late 60's (upside of a hiring boom), and ran the wave all the way to his age-forced retirement as a senior 767 Check Airman. Have another friend who began his airline career in the early '70s (downside of the hiring boom) that had four furloughs and three airlines go bankrupt until he found himself flying First Officer on a Jetstream at age 48... "timing is everything"... After 9/11, there were lotsa very experienced pilots chasing the few available airline jobs, and only within the last year or so has the market become "pilot friendly" again, to the point where one regional carrier is paying a $5k signing bonus for its newhires... It's anyone's guess how long this cycle will last, but four to six years seems to be about average. I believe the military trains excellent pilots, and that it should be in the mix, but it also can tie your hands. If you're committed to a 4+ year military gig when the hiring starts, the "prime time" for hiring would likely pass you by. Additionally, the number of full time active duty pilot slots is fewer than during Vietnam or the Cold War, making access to such training more difficult and waiting for such a slot may not be in a pilot's best career interest. It is obviously easier if you are a reservist, but believe those pilot slots are filled by prior active duty and/or current airline pilots... While all airlines "want" a list of accomplishments and education, what they actually [u]hire[/u] is driven by the market, and if they are short of pilots, their "demands" adjust accordingly. While having a military flying background doesn't hurt, their demands for advanced degrees and military flight time has all but been eliminated. FWIW, I suspect we will see many carriers establish "ab initio" programs to solve the impending shortage (NWA developed such a program before 9/11 and UAL was investigating it). Also agree that it ain't cheap to pay for the professional school route, but the quid pro quo is that if Dave [u]really[/u] wants to fly for a living, he'll do what many before him have done... buckle down and make it happen. I'm sure you have seen a number of your grads go on to instructing, charter, find a job with a regional and move on to a national/major career. Cheers! Jim
Posted on: 7/8/2007 11:52 PM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6086682

RE: Deciding to become a pilot?
[quote]ORIGINAL: normgoyer If you are aiming at becoming a professional pilot, go to college and finish. If your education stops at High school you are not going to find a good job in aviation. Join the military and learn your trade with experts. Norm [/quote] Norm, Agree that finishing college is a must, and at the risk of starting a pi**ing contest, there are also expert professional aviation schools in the civilian world... In fact, graduates of those schools (Embry Riddle, Spartan) who then go to work for the commuter airlines are among the strongest candidates when looking for large airline employment. They learn and work in the daily grind of civil airport and airline operations. When hiring for our MD80 operation, our target is a regional jet pilot with 1500+ hours, most of whom have come from general aviation, many from the professional flight schools. Military pilots are technically and procedurally superb, and top notch in smarts and the ability to learn, but obviously have little experience in the daily application of the Federal Aviation Regulations used in airline ops, and those rules dictate the conduct of any airline operation... Cheers! Jim
Posted on: 7/8/2007 2:35 AM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6083461

RE: Deciding to become a pilot?
[quote]ORIGINAL: Dave trimmer I was talking to a fellow at the field and he said that most companies that hire you as a pilot can't keep up maintenance and he said it is dangerous to fly sometimes because most planes are not up to suff. Is this true at all or exact, any help would be a great help. Thanks for your help, dave trimmer [/quote] Based on the safety record of aviation, this bit of "Information" can be discounted by common sense alone, and I suspect this fellow also wears tin hats to listen to the UFOs and has a pyramid at home to keep his fruit fresh... ;) Definitely NOT a source of career information. Based on 30+ years in various forms of aviation, his comments are without merit. The [u]occasional[/u] flake who tries to cut corners on maintenance is discovered either by the pilots who fly the airplanes or the government aviation agency responsible for monitoring aviation safety, and either cleans up his act or goes out of business..
Posted on: 7/8/2007 2:16 AM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6083434

RE: Deciding to become a pilot?
[quote]ORIGINAL: Dave trimmer I posted a while back and have decided to ask yet another question. When you became a pilot did you lose interest in the hobby? I don't want to lose interest in the hobby by becoming a pilot. thanks, dave trimmer [/quote] Dave, FS flying and model aviation go well together... many airline pilots do RC on their days off.. just can't get enuf flying :D Cheers! Jim
Posted on: 7/1/2007 11:30 PM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6060065

RE: Deciding to become a pilot?
[quote]ORIGINAL: Dave trimmer I think I will do well, but I have one last question, marriages In my last post we talked about divorces in result of time away from home, How common is this? The reason is I'm 17 and I don't want to waste too much money if all my future girlfriends (or more than that) to leave me for various reasons. To me this is one of my fears more than anything. Thanks, dave trimmer [/quote] Dave, My $.02 - [i][u]Never[/u][/i] give up your dreams for anyone else. Find a woman who shares them, or at least understands and accepts them. I have too many friends that gave up their dreams and are truly miserable... and often divorced anyway. If you [i][u]really[/u][/i] want to fly, nothing will get in the way... If something gets in the way, then perhaps you didn't want it that badly... Cheers! Jim
Posted on: 7/1/2007 11:28 PM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6060052

RE: How real is FMS? SHould I get somethng else?
Depends on what you're using it for.... IMO, FMS is great for the price (free!) at teaching you basic control, takeoff and landing, and flying the model to and from you. Realflight has much better graphics and realism, but you pay for it...
Posted on: 7/1/2007 1:21 AM by Author "Jimmbbo" in the forum "RC Flight Simulator Software"
http://www.rcuniverse.com/forum/fb.asp?m=6056756

RE: How to Secure Nyrod in Firewall?
[quote]ORIGINAL: dbacque Sand it first, then epoxy or CA will stick to it fine. Dave [/quote] Ditto... Fit needs to be tight, so if you have to make the hole larger to allow a straight run for the throttle cable, make a doubler of 1/8 thick ply with a tight hole in it - CA to firewall over the larger hole. The doubler method also works well to stabilize a long run of nyrod.. Cheers! Jim
Posted on: 7/1/2007 1:00 AM by Author "Jimmbbo" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=6056705

RE: U guys ain't so tough...
NTSB just released an investigation status report (below - [i][u]emphasis added[/u][/i]) - indications are that it is a mechanical problem... Am very surprised that a gear control/indicating system could be designed in compliance with FAR 25 and allow ANY positive indication without the gear being down and locked... But after flying a Brasilia for over 2000 hours, I shouldn't be surprised at some of their design choices.. :D Very glad the crew had quick reactions and were able to go around... Cheers! Jim NTSB ADVISORY ************************************************************ National Transportation Safety Board Washington, DC 20594 June 29, 2007 ************************************************************ NTSB INVESTIGATING LANDING GEAR MALFUNCTION ************************************************************ Washington, D.C. - The National Transportation Safety Board is investigating an incident in Boston that occurred on June 20, 2007, in which an American Eagle Embraer ERJ-135 regional jet briefly touched down on the runway without the landing gear extended before initiating a go-around and completing a second landing attempt. None of the 37 passengers or 3 crewmembers was injured. The aircraft sustained minor damage. The event is being investigated as an incident. Prior to the first landing attempt in which the gear was not extended, the crew stated that the three landing gear indicator lights were all green, indicating that the gear was down and locked. Shortly before touchdown they noticed a "landing gear lever disagree" message on a flight computer console. After the jet contacted the runway, a go-around procedure was initiated. The crew extended the gear by following the emergency abnormal landing gear procedure, then flew by the control tower twice for a visual inspection to ensure the gear was down prior to the second landing attempt. At this point in the investigation the following has been accomplished: [i][u] In an initial test, the incident aircraft was placed on jacks and investigators duplicated the in-flight situation: Three green lights in the cockpit indicated the gear was down and locked but none of the gear extended. [/u][/i] The cockpit voice recorder and flight data recorder were sent to the Safety Board's laboratory in Washington last week where the content of each is being evaluated. Both members of the flight crew were interviewed this week. [i][u]An electronic component of the landing gear control system, made by Parker Aerospace, was bench tested this week at their facility in New York. The same unit, with small modifications, was then placed in a different airplane and the indications were once again duplicated. [/u][/i] Embraer issued a "Field Service Letter" late last week to all operators of the EMB-135, -140, and -145 models, reminding pilots to follow the checklist in the case of a "landing gear disagree" message. The Federal Aviation Administration, Parker Aerospace, American Eagle and Embraer are working with the Safety Board as the investigation continues. [b][/b][u][/u]
Posted on: 6/29/2007 5:50 PM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6051962

RE: INCREDIBLE PLANE ! LOOK !
With all the A380 delays (first delivery has been slipped for the third time to October 2007 - anyone taking bets on whether that date is gonna hold?), reckon the door is opened for Boeing's 747-8, especially for current 747 operators (parts, training, support are already in place) - The way things are going at Airbus, the Boeing 787 may be available before they can deliver ;) And, yes I like California wine :D Cheers! Jim http://www.boeing.com/commercial/747family/747-8_facts.html "The 747-8 Intercontinental is the only jetliner in the 400- to 500-seat market, stretched 5.6 m (18.3 ft) from the 747-400 to provide 467 seats in a three-class configuration and a 14,815-km (8,000-nmi) range. Using 787-technology engines, the airplane will be quieter, produce lower emissions, and achieve better fuel economy than any competing jetliner. Compared to the 747-400, the 747-8 Intercontinental will provide nearly equivalent trip costs and 10 percent lower seat-mile costs, plus 28 percent greater cargo volume. Operating economics will offer a significant improvement over the A380. The 747-8 is more than 11 percent lighter per seat than the A380 and will consume 10 percent less fuel per passenger than the 555-seat airplane. That translates into a trip-cost reduction of 19 percent and a seat-mile cost reduction of more than 3 percent, compared to the A380. Both the 747-8 Intercontinental and 747-8 Freighter can use the existing infrastructure and ground equipment at most airports worldwide."
Posted on: 6/23/2007 6:22 PM by Author "Jimmbbo" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=6025013

RE: Nylon bolts for rubber bands
[quote]ORIGINAL: CrateCruncher I've been using Carl Goldberg 10-32 nylon bolts molded in black. I just now took one and bent it back till the threads touched in a loop shape. I haven't attached 125 pounds to one but I bet they could take twice that much and not break. They just streeeetch. Assuming 4 bolts on a 5 pound airplane thats 500 pounds or [b]100 g's[/b] to make the bolts fail[X(]! YMMV [/quote] FYI, did a comparison of the strength of generic nylon, brass and steel screws in different sizes... Cheers! JS
Posted on: 6/23/2007 5:40 PM by Author "Jimmbbo" in the forum "Kit Building"
http://www.rcuniverse.com/forum/fb.asp?m=6024885

RE: Terminating Antenna Wire
[quote]ORIGINAL: jaka I have all my antennas inside the fuselage within a 3mm sodastraw glued inside the fuselage. [/quote] Ditto - cheap, light, simple :D
Posted on: 5/6/2007 3:54 AM by Author "Jimmbbo" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=5816919

RE: Trainer wing question
[quote]ORIGINAL: MinnFlyer ... Bang a wingtip on the ground and with rubber bands, you may have a wingtip to fix. With bolts, you have to fix the wingtip plus the fuselage which you ripped wide open. [/quote] Ditto... You gotta know you're gonna cartwheel it while you're learning - Would be a minor repair (if any) with rubber bands, done for the day with bolts... When you get more 'sperince, you can use bolts... A bag of #64 rubber bands is a couple of bucks, cheap enough to replace regularly (good idea), so weakening with sun and fuel shouldn't be an issue. Cheers! Jim
Posted on: 4/30/2007 12:14 AM by Author "Jimmbbo" in the forum "Beginners"
http://www.rcuniverse.com/forum/fb.asp?m=5790009

RE: Paint match?
Painting with latex works fine - do a RCU search on the subject... Also, this is a good article on the subject... http://www.houstonhobbies.com/tips/painting/latex/spraying-latex.pdf Cheers! Jim
Posted on: 4/29/2007 11:48 PM by Author "Jimmbbo" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=5789878

RE: Engine Test Stand
Built this one that can be clamped to WorkMate or picnic bench... light, cheap, small... My kind of stand... Cheers!
Posted on: 4/22/2007 12:50 AM by Author "Jimmbbo" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=5751336

RE: F-9 Panther color scheme question
DOH... didn't see that till they were posted full size... Gotta get my vision checked ;)
Posted on: 4/22/2007 12:05 AM by Author "Jimmbbo" in the forum "RC Jets"
http://www.rcuniverse.com/forum/fb.asp?m=5751182