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Old Oct 17, 2012, 11:53 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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the retracts mounting wood pieces and bulk heads need to be reglued,also some stiffeners should be added to help hold the weight and thrust of the engine.there is a turbine thread over in RCU that explaines what is needed on tubine powered birds. i would make the main gear legs shorter as seen in the mods i did at the front of this thread.
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Old Oct 28, 2012, 07:56 AM
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United States, MA, Hingham
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Servos

Im just starting to build my 1st falcon

Initially going to try it with the cs120 fan inside the airsally nacelle...12s

This is not going to be a power monster but I believe in buying the best electronics from the start...

What's the best servo combination to buy for the edf falcon 120?

Thanks
Anthony
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Old Oct 28, 2012, 10:27 AM
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I have 645mg's on the flaps and ailerons, 225mg's on the rudders and a single 5685 on the elevator mount under the stab. Tons of flights with this configuration and no issues.

I would really consider a better fan, those cs120's have had tons of issues. If you want to do it right get a more reputable fan, Dynamax is a perfect fit for this model.
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Old Oct 28, 2012, 11:51 AM
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I've used the 120 12 blade for months now ....no issues no matter how much I've abused it and it's one of the best sounding fans on the market for the price...

Do the mods outlined in the cs 120mm 12 blade thread....I took me 15 mins to do the gluing and it balanced perfect after that...30 mins of glue set it over night and balance the next day.

Haoye 127mm comes to mind also with the HK 560kv motor with banana hobby 90amp esc that I've taken to 110 without airflow for 10 - 15 seconds...cost 54 usd, twm escs look really reliable so far

I flew with the 127mm before the CS 120 12blade, very similar thrust and the air sally lip can be used with no cutting on the lip or 1mm surround around the outside of the shroud.
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Old Oct 28, 2012, 12:17 PM
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Good luck with that. When the blades come apart at over 20,000 rpms you will have a mess on your hands. Guys like you will learn someday that you get what you pay for......
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Old Oct 28, 2012, 01:05 PM
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Originally Posted by bri6672 View Post
Good luck with that. When the blades come apart at over 20,000 rpms you will have a mess on your hands. Guys like you will learn someday that you get what you pay for......
Been flying with the cs 120 12 blade at 27000 rpm for more than 3 months now..tested it at 22lbs of thrust at 7500 watts...tipped the Falcon on to the shroud...grove in the shroud no thrown blades.

There's a mod for the fan and it takes less than 30mins...

I learned early to look at specs and reliability and not at cost in this hobby.

If I'm paying more than 3 - 4 times the price of the less expensive reliable gear I would like more than 3 - 4 times the performance...that aint happening for the most part.

Knife has more than proven over and over that if you have more time than money you can get some really nice performance by DIY
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Old Oct 28, 2012, 01:13 PM
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Running that fan at those rpms is just irresponsible. Hope nobody is around when that thing comes apart.
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Old Oct 28, 2012, 02:16 PM
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Originally Posted by bri6672 View Post
Running that fan at those rpms is just irresponsible. Hope nobody is around when that thing comes apart.
You talking about post mods?

Don't know anyone who's popped a cs 120mm 12blade fan post mods...

Do you?

Thx in advance

I've got so many flights on it I stopped counting

Like some of the other well known fans the blades have to be glued for reliability

regards
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Old Oct 28, 2012, 02:22 PM
Go fast, pull up.
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What mod are you talking about?

Quote:
Originally Posted by erh7771 View Post
Been flying with the cs 120 12 blade at 27000 rpm for more than 3 months now..tested it at 22lbs of thrust at 7500 watts...tipped the Falcon on to the shroud...grove in the shroud no thrown blades.

There's a mod for the fan and it takes less than 30mins...

I learned early to look at specs and reliability and not at cost in this hobby.

If I'm paying more than 3 - 4 times the price of the less expensive reliable gear I would like more than 3 - 4 times the performance...that aint happening for the most part.

Knife has more than proven over and over that if you have more time than money you can get some really nice performance by DIY
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Old Oct 28, 2012, 02:32 PM
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I don't care what "mods" you are doing, it's an underdesigned fan that is an ongoing liability! I have seen first hand what cheap Chinese fans can do to someone when they eventually come apart.

YOU are contributing to the problem in this hobby, comments like yours encourage people to get into things they shouldn't!

I don't care if you want to save money, there is a level of safety and responsibility associated with this hobby.

I spent a lot of money on some of my fans, I didn't want to but it's a matter of respecting this hobby and bring reliability and safety to my field and the events that I fly at!
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Old Oct 28, 2012, 02:42 PM
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Originally Posted by Fidelity101 View Post
What mod are you talking about? ..
Got the mods outlined in the CS 120 12blade thread...not a lot of work....maybe 30mins worth of mods to reinforce the motor mount and the keep the blade bases from sliding.

Most recent test with 400kv motor is 11.5lbs of thrust at 2580 watts...that's 23lbs of thrust at 5160 watts using two of them...

55amps per fan on 12s..I was using the YEP esc to get over 12lbs of thrust at 2680 watts...on the 11.5lbs test I was using the YTW esc rebranded for banana hobby.

Quote:
Those numbers are impressive! I have the CS120 four blade fan and it's only giving me 15lbs of thrust at 5800 watts. It sounds like a hair drier but performs well enough for a 4 minute flight.
The CS 12 blade fans are pretty efficient...not as efficient as a shube or BVM but they're 250 shipped 14s esc fan and HK 560kv motor....18lbs 12oz of thrust at 6100 watts on 14s using the YEP esc and 14.5lbs of thrust at 4400 watts on 12s same set up. The YEP esc's are giving me more thrust to watts than the others...I know they had to redesign the etching on the boards for more amps and that might be doin it.

I'm at 16lbs auw with the smoke system and I'm off the gear in 20 - 30 feet....

Static thrust with that fan is really nice
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Old Oct 28, 2012, 02:58 PM
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Originally Posted by bri6672 View Post
I don't care what "mods" you are doing, it's an undersigned fan that is an ongoing liability! I have seen first hand what cheap Chinese fans can do to someone when they eventually come apart..
You have to know what you're doing first, I'm not the only one that has proven many times that with a couple of mods on some nice priced fans that don't bust a wallet can put out some really nice numbers if you have an hour of extra time.

Quote:
I don't care if you want to save money, there is a level of safety and responsibility associated with this hobby.
Again...there are plenty of expensive products out there that burn up planes during flight and crash them near houses...I've seen it first hand with people who know what they're doing.

It's not a matter of saving money with me, ...if I'm going to pay 3 times the price for somethin I want 3 times the somethin more out of it...I usually don't get that

Quote:
I spent a lot of money on some of my fans, I didn't want to but it's a matter of respecting this hobby and bring reliability and safety to my field and the events that I fly at!
Look, I'm not tryin to smash on anyone who wants to put out the dough...for those who don't want to put out the dough or can't there are RELIABLE alternatives.

Some people have more money than time or more time than money...for the latter there has been proven setups that fit the bill that are reliable and noted to work.

What do you think about the haoye?

bigger fan similar numbers with scorpion motor...

regards
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Old Oct 28, 2012, 03:08 PM
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United States, MA, Hingham
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Fan-

I'm new to edf jets and didn't realize the cs120 needed work to be used...

I'll just buy the dynamax xps as it fits the nacelle and sounds like a better performing unit with no work...


Thanks for the info

Anthony
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Old Oct 28, 2012, 03:17 PM
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Originally Posted by erh7771 View Post



Again...there are plenty of expensive products out there that burn up planes during flight and crash them near houses...

Totally agree with that, but lets not put another negative factor in the already bad equation!
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Old Oct 28, 2012, 03:20 PM
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Quote:
Originally Posted by Jag1972 View Post
I'm new to edf jets and didn't realize the cs120 needed work to be used...

I'll just buy the dynamax xps as it fits the nacelle and sounds like a better performing unit with no work...


Thanks for the info

Anthony
Anthony,

That is a good idea but it is heavy for 12s, the scorpion DynEmax puts out about the same power and is over a lb lighter.

Tams modified fan is a good option for a 19 series motor. Don't count out the Turbax as well, it is one of the most underrated fans on the market. Just get something that is pre-balanced and proven and have fun with the falcon.
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