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Post  barun on Tue Apr 07, 2020 3:24 pm

Dear All, I have bought the Brodak CL Basic Trainer 049 directly from Brodak : assembled it and fitted a Cox 049 Sure Start engine and mounted a 23 cc Brodak fuel tank for 1/2 A CL model.
The model is balacing 25 % if the chord from the leading edge of the aerofoil. Kindly suggest whether the plane flies or not. Kindly suggest orvadvice me so that I can make it fly, without any stunt. I have got cox 6x 3 , 5 x 3 , APC 5.5 x2 propellers. Kindly suggest which prop shall I use for beginners slow speed stable flying. Pls help.
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Post  Ken Cook on Tue Apr 07, 2020 7:13 pm

The plane is a trainer and I would bet without a doubt it's nose heavy intentionally. Put your finger on each side of the wing where the front leadout exits and pick the plane up. The plane will nose down and should nose down. Make certain that your tip weight is in place on the outboard wing. Don't balance the plane at first if the plane is nosing down holding it by your fingertips where I have mentioned. Fly it and see how it responds. Obviously, flying over grass is recommended.

            The important part is that your pushrod is installed in the hole which is closest to the center of the bellcrank.  I don't recall what control horn Brodak uses on the elevator, if it has multiple holes, you should locate the pushrod to the hole furthest away from the elevator for the first flight. This advice slows the movement of the controls down . If more elevator is needed, raise the pushrod in the control horn one hole at a time.  

       The next factor is your flying handle, your handle shouldn't be a large spaced handle. The distance the lines should be no greater than 3" apart and a 2.5" handle is even better.  Your prop choice for your first flight in my opinion would be your 6x3. Lean the engine out to the maximum on the ground and back the needle off until it starts to burble a bit at this point go slightly in a touch on the needle and launch.
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Post  OhBee on Tue Apr 07, 2020 7:44 pm

A 3/8 0z tank is 11 cc and will get you near a 5 min. flight! You don't nead that big tank for an .049! I wouldn't put more than 5-6 cc in it at first. You'll fall down from the dizzys long before the engine quits!
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Post  barun on Wed Apr 08, 2020 12:38 am

Thank you all very much ; I will put 10 cc fuel in the tank and will RC Plane My fear is that will it fly or not? Will it leave the ground? If I put 10;cc fuel in a 22 cc tank ( already fitted) , will the Cox 049 suck fuel and run properly ? Pls guide
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Post  getback on Wed Apr 08, 2020 6:00 am

Hello , didnt we cover this allready https://www.coxengineforum.com/t13920-how-and-where-to-fit-the-external-wedge-fuel-tank-to-cox-049-sure-start?highlight=fuel+tank  did you set it up as told and pictured ? Have you ran the engine yet ? what fuel are you using ? what battery pack to start it with ? Very Happy  You should run it on the ground and get yourself fermierul with the tuning Bee sure the prop blast is going to the rear to cool the engine and pull it forward .
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Post  Oldenginerod on Wed Apr 08, 2020 7:07 am

barun wrote:Thank you all very much ; I will put 10 cc fuel in the tank and will RC Plane My fear is that will it fly or not? Will it leave the ground? If I put 10;cc fuel in a 22 cc tank ( already fitted) , will the Cox 049 suck fuel and run properly  ? Pls guide

A 22cc tank is around 3/4 oz if my sketchy imperial understanding is correct.  Brodak wedge tank in 3/4oz looks very long for your plane.  Is this the one?
Brodak CL Basic Trainer 049 Bh-50310

I still think the tank is way too big for that plane and I can't help thinking that you're a little ambitious to plan to fly first up with 10cc.  If you do get it in the air, it'll stay there for a loooong time.  Are you experienced with control line flying?
If 10cc is your aim, I would have been finding a smaller tank that fitted more easily.  If the tank is mounted correctly there's no reason why the larger tank shouldn't still draw fuel ok.
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Post  barun on Wed Apr 08, 2020 10:48 am

I am using 60% methanol, 20% nitromethane, 20% castrol. I havevfitted cox tan, square shaped, sku no : TANK506- will it work or only wedge shaped tank will work - I have 1/8 oz wedge rank , sku : TANK515: now I am confused : which type of tank to use : the square or the wedge... Kindly guide
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Post  Dave P. on Wed Apr 08, 2020 3:26 pm

Here's a picture of a Brodak 2/3 ounce wedge tank and a TD for size comparison.  It should fit fine. It is a big tank though, so what I might try is to run a couple tanks through it, timing it and then simulate flying that long turning in a circle at about 5 or 6 seconds a turn. That should give you an idea of whether you or the tank runs out of gas first.  Adjust accordingly.
Brodak CL Basic Trainer 049 Img_2020
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Post  barun on Wed Apr 08, 2020 3:34 pm

Many many thanks - sir - it is a great help
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Post  barun on Thu Apr 09, 2020 3:07 am

Respected all, with all of yours undaunted support, as of now, my fuel tank problem is resolved : I have got Cox wedge tank : SKU TANK 502 , capacity 11 cc ( 3/8 oz) --- I will put 5/6 cc nitro fuel and start with it
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Post  barun on Fri Apr 10, 2020 10:15 am

The pic of the 11 cc wedge tank fitted on the Brodak Basic Trainer 049 --- it is possible with the help and suggestioBrodak CL Basic Trainer 049 Img_2017
n ofball of you
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Post  andrew on Fri Apr 10, 2020 10:24 am

Dave P. wrote:...............It is a big tank though, so what I might try is to run a couple tanks through it, timing it and then simulate flying that long turning in a circle at about 5 or 6 seconds a turn. That should give you an idea of whether you or the tank runs out of gas first...........

Sage advice!!
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Post  NEW222 on Fri Apr 10, 2020 10:46 am

What length lines are you planning on using? Estimating a 5 to 6 second lap will require a longer line with that engine. I have a Baby Ringmaster profile 1/2a with a Black Widow that is well worn, and on 30 or 35 foot lines I was getting around the 3 second mark, maybe 3 1/2 on a bad day. Not sure what the trainer you have calls for lines, but it looks similar to mine size wise. Would probably ly be good to start with 42 foot lines, and shorten if necessary.
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Post  barun on Fri Apr 10, 2020 11:52 am

Thank you ; will use 40ft line and 5 or 6 cc fuel for flying as per all of yours advice. My only question left - is it a proven model? Have anyone build and flown this model? Will this model leave the ground st all? My first CL model, a Skybee Medium powerd by a PAW 2.5 cc diesel engine - never left the ground, although the engine with 8 x 6 prop was spinning at 10,000 rpm - that's my fear - another failure....
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Post  OhBee on Fri Apr 10, 2020 2:25 pm

Of couse it will fly! Its a trainer designed for that engine! The rest is up to the pilot!  🙂 but I would stick with 35' lines MAX!  Probably some less at first. I'd start with 5cc of fuel and no more than 30'  lines. Adjust from there. Too long of lines and those plank wing planes will be coming in on you! It did come with some flying instructions didn't it?
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Post  barun on Fri Apr 10, 2020 3:17 pm

Hello ohbee
Thanks a lot for your prompt advice , help and encouragement. The kit has a instruction booklet - general in nature for all CL planes as provided in Brodak's web page.
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Post  Ken Cook on Fri Apr 10, 2020 3:46 pm

Aside from the pushrod and handle advice I offered you, I would also like to offer this advice. You could double your tip weight until your comfortable flying the plane and then you can reduce it. While this will make the plane fly with the outboard wing dropped, it will offer more stability until your experience level builds up. If this is your first time flying control line, you can also install your propeller on backwards which will slow things down immensely.
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Post  barun on Fri Apr 10, 2020 5:03 pm

Hello Ken, thanks a lot. I have put the pushbrod in the inside hole of the bell crank. The handle is taken care of. Now, I could not understand fitting the propeller backwards... Kindly elaborate it, preferebly with a sketch or a picture. What size of prop shall I use -- 5 x 3 ; 6 x 3 , 5.5 x 2 --- kindly guide for slow flying
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Post  barun on Fri Apr 10, 2020 5:10 pm

Hello ken : you have already recommended 6 x 3 . Now, the engine needs to be break in with minm 20% castrol - during flying - The tuning you suddested : make it maxm lean, then richen it till it starts burping, then slightly lean it before the plane is left on the ground for taxiying and take off : is it correct? If not kindly correct me. Thanks is in advance - also the length of control line wire : 20 ft : is it ok.... Pls guide...
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Post  Ken Cook on Fri Apr 10, 2020 7:45 pm

The propeller is designed to go on the shaft in one direction. By flipping the propeller over, it great reduces the efficiency of the propeller. Therefore, the plane will go rather slow but not so slow that it can't take off. As far as needle setting, you don't want to launch with the engine too lean and also not too rich. My instructions offer a compromise between both. Your line length is rather short for that plane. Did you just unroll a roll of Dacron line and loop it back on itself? You really should have 35' from handle to plane. Even with 35' lines your plane will be fast, at a line length of 20' your really going to be fast and the plane could certainly get away from you.
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Post  barun on Wed Apr 29, 2020 2:44 pm

Dear all,
Here I am once again. My brodak basic trainer, fitted with cox 049 sure start and 3/8 oz wedge tank ( 11 cc) - tank SKU:502 the engine runs only 1.2 minutes on a full tank. 20 % castrol, 25% nitro and rest 55% is methanol. How to improve the running upto 3 or 4 minutes.. Pls guide

Best regards
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Post  GallopingGhostler on Wed Apr 29, 2020 2:51 pm

barun wrote:Dear all, Here I am once again. My brodak basic trainer, fitted with cox 049 sure start and 3/8 oz wedge tank ( 11 cc) - tank SKU:502   the engine runs only 1.2 minutes on a full tank. 20 % castrol, 25% nitro and rest 55% is methanol. How to improve the running upto 3 or 4 minutes.. Pls guide

Wedge tank to empty requires centrifugal force provided by the circling plane at the end of the lines to hold fuel at tank pickup point until near empty. Running static will cause the tank to empty until fuel reaches the tank pickup, which is half way.

To empty, I've taken the plane in hand and tilted the aircraft left wingtip upward so that gravity places the tank pickup on the bottom. Then you will at least double your run time and properly empty the tank.
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Post  barun on Wed Apr 29, 2020 3:13 pm

Thanks a lot let me try it.
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Post  getback on Wed Apr 29, 2020 4:07 pm

lol! lol! Yeah you fly it and bee wanting it to run out !! This Site Rocks! Did it run good ? Popcorn
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Post  barun on Wed Apr 29, 2020 6:30 pm

Yes, running good for 1.25 minutes only with 11 cc ⛽
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