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- This topic has 67 replies, 11 voices, and was last updated 14 years, 11 months ago by Dean McGinnes.
12/07/2005 at 10:40 am #40414AnonymousInactive
I was wondering what engines are used these days. I still have a cox td 049 and also a 09. Are there better engines now? I have just built a 60 inch 60s style contest model. I am old enough to be into nostalgia! There aren’t too many open spaces in my area of England so I might just add micro radio. My td 049 has a silencer but I remember it reduced power a lot. I tried running the td09 yesterday. It is very loud at full revs. Thanks in anticipation, Jim12/07/2005 at 11:27 am #42757AnonymousInactive
You have come to the right place for a consultation (I had to get that one in given your profile) and the prognosis on your condition (done it again!) will depend on whether you want to fly for fun or gravitate to competitions.
Time to get serious, yes, there are other engines available in the 049 class; AME or Norvel 049, Profi 049, Magnum 049, Cyclon 049 and not for getting, the PAW 049 diesel. Of that selection the PAW, Norvel and Magnum come with mufflers (exhaust restrictors would be a better description) the others do not. the Cyclon and Profi are straight out racing engines and are not cheap (see Martin Gregories website for details) and if as you say, you are constrained for flying sites then the noise will not win you any friends. The Cox you have will still serve you well even with a muffler fitted or you may consider flying in the British 1/2A class which is centered around the Cox engine (see BMFA website for details).
For 09 size engines there is (and I stand corrected) nothing approaching the Cox for power and the right size model with this engine would be suitable for open power and that unfortunately is the only class you could use it in. A vintage 1.5cc diesel would be more practicable as you could use it in Brit Diesel and/or Vintage events run in England.
I’ve just remembered that there is a Brodak 049 (ex USA) that is about as powerful as the Cox 049 and has a decent muffler provided.
Hope this helps you.
12/07/2005 at 12:13 pm #42758AnonymousInactive
Thanks for that info.I have made a model with light and strong wings and tail with lots of triangulation and some carbon. However the fuselage is a bit heavy, haveing made it from sheet balsa. As the cox is light I have had to move the wing back. I have soldered up a fuel tank but its a bit heavy, 1 ounce. Do you know a source? Anyway its all good fun. I am going to fly it free flight but use radio to bring it back to the launch site. I have used a KSB timer and rigged up the dethermaliser, which takes me back a bit. When I have learned how to upload photos and video I will post them.Best wishes Jim12/07/2005 at 12:34 pm #42759AnonymousInactive
I cannot help you with commercial tanks, they just don’t make them anymore. I make my own out of K&S tin plate about 12mm x 12mm x 30mm and use 4; 2mm dia brass tubes (2 in, 2 out) and finish up weighing about 10 grams (28.4 to the ounce).
As for designs, I would look towards the 1/2A Texaco or PAAload type models as mentioned in another post on this forum and these designs will allow you to fit radio for your purposes and be more practical that pure contest pylon models which for a Cox 049 should be smaller than what you are using at the moment. They are my suggestions as avenues to explore.
Ployd12/07/2005 at 5:46 pm #42760AnonymousInactive
All I need now is some decent weather. No more thermals here in December. My son reports the weather is lovely in Aukland. I need to retire and join him.to avoid our winter. I am working on a “Prima” wakefield kit also. Its from eastern europe and seems to be high quality. So while it rains here I have some indoor projects. I might try soldering up a silencer for the td09.Thanks for your help.12/12/2005 at 2:33 am #42761
Investigate Brodak for some tanks. I THINK he is producing a bunch from the old Perfect line. Or use a balloon. Or pen bladder.
12/12/2005 at 3:24 am #42762Dean McGinnesParticipant
Per Dan Berry’s recommendation.
Ditch the metal tanks for bladders. Easy to make, cheap (I use pop rivets for tank fittings), and fuel feed is never, never, ever, ever a problem again.
You can almost CA your needle valve in place.
Almost, but not quite. Open a few clicks for the first start of the day, then when properly set. you can forget it for the rest of the day.12/12/2005 at 4:16 am #42763
Neoprene pen bladders aren’t affected by fuel.either.12/12/2005 at 8:55 am #42764AnonymousInactive
Thanks for that. I got my TD09 running on the bench, but it won’t start in the plane. Something wrong with my tank or fuel line.I have checked the carburetter and can’t see anything wrong. The holes are so small I can see it would not take much to block them.It only runs on the prime. Sounds like I definitely need a neoprene bladder. Can you recommend a source for me. I have just bought a set of 4 tanks made by “Perfect” off eBay but they have not arrived yet. Sounds like they will have to be used in something else.12/12/2005 at 9:07 am #42765AnonymousInactive
I test glided the model on Saturday. It flies well with the C of G about 3/4 of the wing chord.Compared with my other models it flies so slowly, so I am very pleased.The next step is sorting out the engine fuel supply.12/12/2005 at 2:47 pm #42766
Pen bladders are now called ‘pen sacs’. Available from
They are sized in 1/64″ increments. I use #12 for 1/2 A and #14 for everything else. I cut them in length as appropriate. I also use some off-cuts to contain batteries in my Walston beacon. Applied w/needle nose pliers.
If the TD has been parked, you could very well have goop in the venturi ports.12/12/2005 at 3:36 pm #42767AnonymousInactive
I,ve never seen them used. I would be glad of some information. The engine’s all cleaned up. I am going to purchase a new battery in a minute and hopefully my finger will survive the flicking! The electric starter is a bit violent for it. If it all fails I shall put a tow hook on it !!12/12/2005 at 4:42 pm #42768Norm FurutaniParticipant
Here’s a real good description of the fuel bladder system. Try: http://www.clcombat.info/bladder.html
I use surgical tubing available from many sources.
– Norm12/12/2005 at 8:56 pm #42769JIM MOSELEYParticipant
Pacifiers/bladders are the only way to go for consistent running
Putting a muffler onto a TD.09 will degrade its performace appreciably…
Hard tanks? http://www.acmemodel.com/tanks.htm12/13/2005 at 9:45 am #42770AnonymousInactive
I took the engine out of the plane and am trying to get it running on the test bench. 1 minute is about the longest I can get. I hope they get easier to start after they are run in. I have read up about the bladders. that is my next challenge. I am wondering about a balloon off a catheter! I am beginning to think how wonderful gliders are.
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