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RE: Bernard Dumas' Canadair CL-215
Hey Teresos, any news from your construction? AAANTEEEEE PEEEEEEEEE!!!!!!!
Posted on: 9/27/2009 2:27 PM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=9127566
RE: Eletronic engine syncronizer **SUPPORT **
Hey!! I was counting on your quick responce!!! fast as a lightning!!! hahahahahahaha you are awesome!!! I knew you would answer me ASAP!!!! Thanks!!!! Pappy/Salonica?Greece PS: Did you sold any other twinsyncs to Greece besides the 2 pieces we ordered here in Thessaloniki?
Posted on: 7/1/2009 12:14 PM by Author "pappy69"
in the forum "Twin & Multi Engine RC Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8894869
RE: Eletronic engine syncronizer **SUPPORT **
Hi all First of all i would like once again to congratulate yl5295 that made a huge effort to build this magic circuit that solved many problems of people dealing with multy engine planes!!! I would like to describe something i observed and i need you advice concerning the red glowdriver LEDs. I got a complete set of twinsync (board, glowdrivers, extra display) which i installed on my CL-415 Although i have installed everything and tested it (powering up the system) without running the engines i observed something that didn't looked normal (to the extend of my knowledge!!). At this point let me describe briefly my setup so that you can have a general idea. I got a CL-415 which is equipped WITH AN 8 CHANNEL RECEIVER as follows. AIL 1 CHANNEL (PARALLEL SERVOS) FLAPS 1 CHANNEL (PARALLEL SERVOS) ELE 1 CHANNEL RUD 1 CHANNEL ENGINES 1 CHANNEL (PARALLEL SERVOS through twin sync!!!!!) WATER DOORS 1 CHANNEL RETRACTS 1 CHANNEL AND POWER AT THE 8TH CHANNEL When i power up the system everything is normal according with the manual. also when i rotate the props and the magnet passes infront of the sensor everything is like it should be. The problem i got is that when i operate the water doors at the open possition the two red leds start flashing. when i close the doors the red leds stop flashing. This happens while i dont have the glowdrivers plugged neither the AUX channel. Does anybody have any idea if this red LEDs flashing is normal and if yes what does it mean? i would appreciate if anybody would illuminate this dark point for me Pappy PS: if you want to take an idea and you do have some time take a look at my building thread : http://www.rcgroups.com/forums/showthread.php?t=1020748 (i hope mods wont take this as a black advertisement !!!) PS II: Does any switch operation pass through the engines channel while i operate the doors channel or it's my wild imagination?
Posted on: 6/30/2009 1:39 PM by Author "pappy69"
in the forum "Twin & Multi Engine RC Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8893832
RE: Bernard Dumas' Canadair CL-215
George did, does and will do an excellent job!!! I have to admit that we kinda make a hell of a team!!! I take pics of the planes and the details as well as measuring them and he scales them down!!!! When i first started to build my CL-415 some 9 months ago i was browsing around and luckily i dropped on this subject!!! 2 people building the same plane (almost!!) in the same town!!! I lost count on how many times working together we came up to solutions and solve numerous problems. I dont remember any more how many times during night - very late- we phoned each other (more from my side!!!).
Posted on: 5/31/2009 2:35 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8812927
RE: Bernard Dumas' Canadair CL-215
That's what i call ART!!!!! [:D][:D][:D][:D][:D][:D]
Posted on: 5/15/2009 6:59 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8770571
RE: NEUTRINO - NEW F3A PROJECT FROM GREECE
Kalimera Ilia!! Did you thote avoiding all this work for the wing adjusters by using something like this: http://www.centralhobbies.com/control_linkage/wingadj.html
Posted on: 3/15/2009 4:58 AM by Author "pappy69"
in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=8579502
RE: Bernard Dumas' Canadair CL-215
Every aircraft is designed to carry under her wings the weight of the fuselage. Those aircrafts they are not designed for aerobatics but for fire fighting. They are designed for strong vibrations ( as water landing produces) but not for prolonged continuous presurres on the wings produced by the G force of the fuselage weight relative to speed.
Posted on: 2/23/2009 9:41 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8508521
RE: NEUTRINO - NEW F3A PROJECT FROM GREECE
Hlia (i kinda keep the Greek ortho on he Name[;)] ) First of all congrats for your craftsmanship as well as the nice design. It's realy nice to see that someone builds and shares his knowledge with the rest of the people on a real building thread and not like some other threads in this forum. Some people start to build something they upload 3 photos, then for 6 months they chit chat for God knows what except the build thread and after 1 year and 16 pages of useless chat they upload the photo of the model already done without any more explanations or description. For the fellow modeller joenella i can say only one think. In our rich Greek language there is a word. This word is parthenogennesis. If you search joenella you might find what that means. To give you a quick explanation parthenogennesis is when something is born for the first time by itself without been copied before. You said that Elias model resembles some other model. I agree!! It realy does!! I agree 100%!! ABSOLUTELY!! Formula 1 cars look alike as well!! Moto GP bikes are almost identical too!! What i mean my friend is that as cars designs evolute through time the same way F3A models do. All the F3A models have almost the same caracteristics. To my knowledge Elias designed a plane based on different ideas based on the dozens of airplanes pased from his hands. He has big experience on F3A planes and as far as i know some years before he build quiet a few. Elias does what you or me or everybody else would like to do. That's build a model that has all the nice characteristics of all the rest planes (at least hoping!!!) Don't judge with a short mind!!! Your stance and your comments can be very well supposed as malicious on purpose!!! In a few words: RELAX MAAAAAAAN!!! PS: I am realy sorry for the long text!! Sygnomi Elias!!
Posted on: 2/14/2009 11:46 AM by Author "pappy69"
in the forum "Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=8473030
RE: Electric or gas?
My humble advise is that if you are planing to keep the weight very low and you are sure you don't want scale retracts extra water carrying and balsa sheeding on the entire wing and fuselage then go for electric. Bernard Dumas designed a similar model but he kept the weight low because he did monocoat and he didn't machined scale retracts. Otherwise to my opinion glow engines are one way solution!
Posted on: 2/10/2009 10:15 AM by Author "pappy69"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8460844
RE: Electric or gas?
Since i have personal experience on this let me tell you what my results are. I am currently building a CL-415 from MRAERODESIGN. The final weight of the aircraft with scale pneumatic retracts but without any power plant on is going to be aprox. 6,8 Kgr. So... My initial decision on the for power plant was electric. So i decided to put 2 Dymond 4260 Motors With 2 60A esc. For batteries 6cell 1 pack 5000mAh. The facts: The aircraft due to its scale design is rather on the heavy side. The above electric power equipment alone weights almost 1,7 Kgr so that raises the weight of the aircraft to almost 8,5 kgr. The wing load for an aircraft of 2m05cm wing span and 28cm wing cord gives the enormous number of almost 150gr per dm2. When i did my tests i thought that it would be ok for a normal scale flight without water carrying. What i didn't took in consideration during bench test was that i had to multiply everything x2 because i had 2 motors. And the most important that i had double consumption on my batteries because the amperage that i was drawing from my batteriew was double. So after calculations i found out that with 1 motor i was drawing 45A and i could have almost 800watts but if you multiply Amps x2 the you draw from your batteries 90A. 90A from a 6cell 1 pack 5000mAh battery gives max 4 minutes of flights if you do good throttle management. If you want to have more flight time you need the double size batteries so that means another 750gr weights and before you know it you have bigger weight and bigger wing load and you need more power and that enters you to an adless travel of chasing more power but always weights augments and you cant realy compensate power to weight!! Of course i could easily sacrifice weight from the aircraft such as to do monocoating on my plane but then it wouldn't look as scale as it could be. So after searching many hours and calculations i ended up on SAITO FA82 engines and twinsync module that synchronizes automatically the engines. I have to say that i am a fanatic of electrics but for this project the glow engines solution is no way back. Besides since my model is going to carry 3lt of water i need the extra power in order to take of and carry this extra load.
Posted on: 2/10/2009 9:42 AM by Author "pappy69"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8460723
RE: CL-415 big scale
seriously now!! If you need any information contact me!!! You can have 1st hand info!!!![;)][;)][;)] I'm building also a canadair (MRAERODESIGN's kit) you can see it at http://www.aeromodelismos.gr/index.php/topic,1925.0.html Pappy
Posted on: 2/10/2009 5:59 AM by Author "pappy69"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8460266
RE: CL-415 big scale
I can show you a photo of what i see right outside of my window in my office!!!!
Posted on: 2/10/2009 5:07 AM by Author "pappy69"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8460263
RE: Bernard Dumas' Canadair CL-215
I have to admit that as students you did a very nice job although that you chose a quite advanced model to participate in the competition. The amazing job that you did on the scale retracts is remarkable. Since you did all this nice job, i supposed that you have high standards & that is why i objected on the cowlings. The objection was rather aesthetic then as the appropriate solution for aerodynamics. Besides in those rc modeling forums such as this one people pays attention to details and specialy on big planes such as a plane of 2,30 wingspan. But if you ever would like to do the cowlings the planking solution on your ready template i believe that is appropriate. Anyway good luck with your competition!!! :)
Posted on: 2/10/2009 4:44 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8460244
RE: Bernard Dumas' Canadair CL-215
This white foam you can find it in every store that sells material for construction. If you dont have very thick block find few thinner and glue them together. Shape with a cutting knife to take the most of the big pieces of and then final shape with sand paper.!! When you are done you can apply again some wax and then yse the same mold for the 2 cowlings!!!
Posted on: 2/10/2009 3:22 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8460162
RE: Bernard Dumas' Canadair CL-215
look on those photos now...
Posted on: 2/10/2009 3:05 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8460145
RE: Bernard Dumas' Canadair CL-215
So here is my idea a little bit improved... You can use the same template. Look at the following photo then and try to understand....
Posted on: 2/10/2009 2:58 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8460122
RE: Bernard Dumas' Canadair CL-215
imagine now that your template is covered with small pieces of balsa (planking technique). This will create a smooth surface and you can then apply all your fiberglass tissue . Before that you have to apply some sort of lubricating material so when the epoxy will be curred you could take the molded part of. As i understand you cant find special wax stuff on your local market but this is not a problem. use a candle and melt it and then with a cloth apply a very thin layer on your mold. Do the same as you did previously and the result is going to be much better If you are carefull on how you going to unmold your cowling you can use it many times and experiment untill you get the best result!! The second idea now.......
Posted on: 2/10/2009 2:56 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8460133
RE: Bernard Dumas' Canadair CL-215
If you want email me the drawings for the engines and i can mold 2 fiberglass cowlings!!! If you cant do that i can give you some ideas about how you can mold in the right way your cowlings. It;s a pity to do all this job and destroy the image of the plane!!!! The last time the idea of the ribs the one after the other was very good. Obviously you didn't got the result you was waiting. If you repeat the same but you cover all arround the wooden mold with stripes of balsa you could create a smoother surface. Then after covering any gaps you create a nice smooth mold. if you cover the mold with Vaseline (the easiest material to unmold the fiberglass cowling after its cured you could then do a nice smooth rounded engine cowling. You could even try to shape a piece of white foam and do the same. I can give you some ideas...
Posted on: 2/10/2009 1:45 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8459991
RE: Bernard Dumas' Canadair CL-215
My good friend!!! You did all this amazing job so far and you did all this artwork on the landing gear you spend more than almost a year and now you destroyed all this wonderful job with those boxes. [b]WHY?[/b][size=17][/size]
Posted on: 2/10/2009 1:05 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8459898
RE: CL-415 big scale
[sm=cry_smile.gif][sm=cry_smile.gif][sm=cry_smile.gif][sm=cry_smile.gif][sm=cry_smile.gif][sm=cry_smile.gif] [sm=bananahead.gif][sm=bananahead.gif][sm=bananahead.gif][sm=bananahead.gif]
Posted on: 2/9/2009 3:48 PM by Author "pappy69"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8457511
RE: Eletronic engine syncronizer **SUPPORT **
Yaw damper and MSAS systems are to reduce yawing oscillations induced in swept wing aircraft I agree. You are 100% right!! I didnt want to confuse people by starting talking about YAW DUMPER and how it works and dutch roll and slip or skid during turns etc etc etc. The subject here has to do with extra feature in our models and not YAW DUMPER!!! Besides intentionally i mentioned the phrase "theoretically speaking" because the real world situation is different. In its simplest form [b]a sort [/b]of YAW DUMPER (which means a rate gyro as i already mentioned on the last post ) on our models can correct deviations even big ones caused by engine failure. But i still believe that the safer way for a safe flight in case of engine failure (when you are outside of the aircraft!!!!) is your own hands!!! You talked about EPR and of course that says it all. To my knowledge in turbine engined aircrafts you don't have to deal with down thrust and right thrust. But in our models that fly with props thats completely different i think!! Imagine now that for one reason or the other you fly your nice B-25 without right and down thrust correction (believe me people like that exist and i can give you 3 URL's in this forum of people they have been building for many years aircrafts and they consider this procedure useless!!) and you manage by trimming to fly straight!!! What happens then if you loose one engine and you want to introduce auto correction? The deviation that the system has to correct is very different from an aircraft that [u]HAS [/u]been right and down thrust corrected. So the supposed 10% rudder auto correction depends on what right and down thrust correction you made to your model if any and/or what trim you have done previously with 2 engines to make it fly straight!!! In order then to apply this 10% you have to determine what position was the rudder before. To do that you need a kind of position feedback. Of course our servos don't have position feedback so you need somehow to read your current position and apply the correct percentage of deflection. That rate gyro does exactly that. So why make this twin sync module complicated since you can do that by installing a gyro? You perfectly described the auto correction system on the real world but what kind of feedback could this small twin sync module have to sense the real deviation and correct it? [u][/u]
Posted on: 2/9/2009 12:47 PM by Author "pappy69"
in the forum "Twin & Multi Engine RC Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8452701
RE: Eletronic engine syncronizer **SUPPORT **
2engsout is right! How you can determine how much of rudder deflection can you give to compensate the yaw effect? As an Avionics engineer previously in NE-3A AWACS 10 years and currently in CL-415 Canadair since 5 years the only system i know that could (theoretically speaking) compensate yaw effect due to engine failure is YAW DUMPER. Yaw dumper has nothing to do with engines control. In modern aircrafts that have autopilot that controls also throttle (auto throttle) this maybe could be done. If you want though to control rudder you could install your self a rate gyro on the rudder and this way if the gyro senses constant deflection then it could apply correction in order to fly straight. If lets say the designer of the system introduces an additional feature that does what you say then how could you adopt it to your aircraft? What i mean is that your plane is right and down thrust corrected according to your model and the effect that would be present is much more different then my 2eng plane and another's plane. So that means that the programming code on the chip that will introduce correction during eng failure has to be written specially for your plane and tested many times until it would work perfectly!!! In real world auto pilot and such a correction system (YAW DUMPER)is specialy made for the type of the specific aircraft and it's interchangeable only on the same type of aircraft. The only way you could do that is only with a rate gyro but again you cant be 100% sure because the speed play a very important role on the correction. As you can see this is not very easy and the best correction and safety is your own hands. Check list of the pilots has the procedure in case of one engine fails. The first step is to pull throttles back then disengage autopilot and YAW DUMPER. friendly, Pappy
Posted on: 2/6/2009 7:24 AM by Author "pappy69"
in the forum "Twin & Multi Engine RC Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8444424
RE: Eletronic engine syncronizer **SUPPORT **
yl5295 What can i say!! Amazing work!! I have been arguing many times with electric guyes about syncin' twin glows and always the excuse is...sorry....WAS that i would never sync my engines!! Now with your great module i just gonna shut their mouths!!! KEEP UP THE GOOD WORK YOU ARE DOING!!!
Posted on: 2/3/2009 1:44 PM by Author "pappy69"
in the forum "Twin & Multi Engine RC Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8434109
RE: CL-415 Canadair 80'' Electric
anyone?
Posted on: 1/12/2009 2:56 AM by Author "pappy69"
in the forum "Brushed/Brushless motors, speed controls, gear drives"
http://www.rcuniverse.com/forum/fb.asp?m=8348408
CL-415 Canadair 80'' Electric
Hi everybody !! I am building a CL-415 Canadair (waterbomber) and i decided to go Electric. To power up the system i got 2 Dymond 4260 (600kVa) and the Dymond 60 Plus ESC's. Because of the scale look i would like to use 4 blade props so i got 2 10 x 6 x 4blades. I installed on one motor and did a test with an analyzer (watt's up from lindinger.au). (Every reading supposed to be multiplied by 2 since its a 2 engine model). To my surprise the analyzer showed me only 29Amps and 620Watts. The final models weight will be 7,5kgr or 16,5lb. I know a rule of thumps that says that to fly scale and safe in the same time you need something like 200 to 240Watts/kgr or 90W/lb. The Batteries are 2x3 cell in series of 5000mAh each. I have a question: Does anybody knows if 11x6 will do the work based on real experience and NOT a power calculator program? Calculator showed me 38amps but the real readings are obviously far out!!
Posted on: 1/10/2009 1:43 PM by Author "pappy69"
in the forum "Brushed/Brushless motors, speed controls, gear drives"
http://www.rcuniverse.com/forum/fb.asp?m=8341162
RE: Bernard Dumas' Canadair CL-215
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 What can i say!!!!! WOW!!!! (Δεν παίζεσαι �ε φίλε!!!Δεν παίζεσαι!!!)
Posted on: 1/7/2009 3:21 PM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8330542
RE: Bernard Dumas' Canadair CL-215
Hi Hadi This is another good idea of what you can do for the engines cowlings! This photos are from a guy in germany that he was buildning a SU-27 and the photos you see are from the radar dome!! A good idea for those molds are also to use a thicker tissue e.g. 75gr or greater, for shaping the cowlings with this technique!! The thicker tissue, shapes better and does not create those ditches between the formers (gravity effect!!!)
Posted on: 1/2/2009 2:28 PM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8309910
RE: Bernard Dumas' Canadair CL-215
Happy new Year everybody from me too!!! Happy and prosperous 2009!!! Safe flight and safe landing as well!!!!
Posted on: 1/2/2009 5:07 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8308653
RE: Bernard Dumas' Canadair CL-215
Dear Nubiros I'm sorry if i become a little annoying but i see that you made such a good job and mostly spend much time to think about your system that it;s realy a shame to have a landing gear that will fold up on the first hard landing and cause a big damage to what you've been building since some months. As a technician working on Canadair for some years i studied for some time the landing system!! Apart that with George we have been studying this system for more then 5 months and i guess George even more!! You have to consider some things that might help you on you landing gear: As designers do for the real landing gears you have to do some test and have some things in consideration. What we know is that the model will weight aprox. 7 kgr. So your landing gear have to withstand somehow 7 kgr that in a given time might drop from the air on a hard landing from a distance of even 1,5 m. That mass from this height produces a "g" force. In the real life both canadair CL-215 and 415 they both have the 2 struts that you have constructed but the secret stand on the upper folding strut! The upper folding strut is the one that is responsible for the lateral forces that are applied to the gear and have the tendency to fold back the assembly. In your case are you sure that the nut that screws in and out on your thread can stand this force? To my opinion you risk to fold on a hard landing! if you want to re-enforce your landing gear you can do something like this on the photo!
Posted on: 1/2/2009 2:38 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8293717
RE: Bernard Dumas' Canadair CL-215
the 2 red pieces can be a folding strut like george did. The blue part could be a servo arm that opens and closes the folding strut. With this setup you can be sure that the folding strut will hold all the forces applied during the touch down and no tendency of folding all your construction will occur!!
Posted on: 12/29/2008 9:26 AM by Author "pappy69"
in the forum "Seaplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8293730
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