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Cox Engine of The Month
Brodak CL Basic Trainer 049
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Brodak CL Basic Trainer 049
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.
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.
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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.
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.
Ken Cook- Top Poster
- Posts : 5634
Join date : 2012-03-27
Location : pennsylvania
Re: Brodak CL Basic Trainer 049
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!
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-24
Age : 73
Location : Minnesota
Re: Brodak CL Basic Trainer 049
Thank you all very much ; I will put 10 cc fuel in the tank and will 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
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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 ? 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 .
getback- Top Poster
-
Posts : 10430
Join date : 2013-01-18
Age : 67
Location : julian , NC
Re: Brodak CL Basic Trainer 049
barun wrote:Thank you all very much ; I will put 10 cc fuel in the tank and will 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?
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.
Oldenginerod- Top Poster
- Posts : 4017
Join date : 2012-06-15
Age : 62
Location : Drouin, Victoria
Re: Brodak CL Basic Trainer 049
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
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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.
Dave P.- Gold Member
- Posts : 477
Join date : 2017-07-31
Age : 67
Location : Durham, NC
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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!!
Re: Brodak CL Basic Trainer 049
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.
NEW222- Top Poster
- Posts : 3896
Join date : 2011-08-13
Age : 46
Location : oakbank, mb
Re: Brodak CL Basic Trainer 049
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....
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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?
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-24
Age : 73
Location : Minnesota
Re: Brodak CL Basic Trainer 049
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.
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.
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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.
Ken Cook- Top Poster
- Posts : 5634
Join date : 2012-03-27
Location : pennsylvania
Re: Brodak CL Basic Trainer 049
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
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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...
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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.
Ken Cook- Top Poster
- Posts : 5634
Join date : 2012-03-27
Location : pennsylvania
Re: Brodak CL Basic Trainer 049
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
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
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
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.
GallopingGhostler- Top Poster
-
Posts : 5704
Join date : 2013-07-14
Age : 70
Location : Clovis NM or NFL KC Chiefs
Re: Brodak CL Basic Trainer 049
Thanks a lot let me try it.
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
Re: Brodak CL Basic Trainer 049
Yeah you fly it and bee wanting it to run out !! Did it run good ?
getback- Top Poster
-
Posts : 10430
Join date : 2013-01-18
Age : 67
Location : julian , NC
Re: Brodak CL Basic Trainer 049
Yes, running good for 1.25 minutes only with 11 cc
barun- Bronze Member
- Posts : 48
Join date : 2018-04-04
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