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HelicopterGasser Model RC HelicoptersOther › Century Predator Gasser Advise
09-10-2007 11:14 PM  10 years agoPost 1
haggy38

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Bogotá - Colombia

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Hi There:

I need some advise about this heli, it wolud be my first gas heli, I have a little experience with scale and 50s. I dont want 3D, just circuits and smooth flights.Which radio?Gyro?Servos,Engine? Is difficult to built it? Engine tune? I live in Bogotá Colombia, so is 2.640mts above the sea...Enough power?

PD: Price$$$ is important!! I envy you all gas heli owners!!!

Regards,
Gustavo

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09-11-2007 12:10 PM  10 years agoPost 2
tlankford01

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Amarillo, TX 79110

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I will tell you my setup

BH hanson pro modified engine
heavyduty clutch and engine stabilizer
servos:
(3)JR 8311 on the sawsh
(1)JR 8700g on the tail
(1)JR 8311 on the throttle

gyro:
Futaba 501 I recommend the 611 or the logitech 6100

I also run the GV-1 governer

My pinion is 14 tooth

Head Speed is 1600 rpm
my ratio is 6.29:1

I hope this helps

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09-11-2007 05:09 PM  10 years agoPost 3
AceBird

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Utica, NY USA

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so is 2.640mts above the sea
I have never heard of this unit of measure could you explain (mts)?

Ace
What could be more fun?

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09-11-2007 05:16 PM  10 years agoPost 4
Nashville

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Formerly Music City now back home in Sunny Florida

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I'm guessing meters

I was Spektrum when Spektrum wasn't cool

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09-11-2007 07:12 PM  10 years agoPost 5
haggy38

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Bogotá - Colombia

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I would like see opinions from Predator Gasser owners...or any one who can give me any light. About the measure is meters.

Regards,
Gustavo

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09-12-2007 02:35 AM  10 years agoPost 6
Excalibur

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Destination: Earth

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Gustavo:

I googled the altitude of Bogota and found that it is at 8600 feet! I'm not saying you can't fly a gasser (or a nitro for that matter), but you really will be at a tremendous limitation, power-wise. I'm not even sure how well the engine will perform at that altitude. I fly my gasser at about 4500 feet ASL (above sea level) with reasonable results, but I've always wondered what it would be like to experience this bird at sea level. Not only do you not have as much air for the engine, but the rotor blades don't have as much air to bite into either, resulting in less lift at a given rotor RPM.

If you do decide to follow through with a gasser, I would strongly suggest you put a Hanson-modified (3D Max) G26 Zenoah motor in it. You are gonna need all the power you can get at that altitude. Since you plan on smooth scale-like flight, I think you could probably get away with it, but I certainly don't think it would perform aerobatics very well.

The only other suggestion I would have is to go with an electric heli for your location. They are typically a little smaller, can wind up the rotorhead to a much higher RPM (much better lift, better performance), and don't suffer motor effects from thin air. Also, If price is important to you as you state, keep in mind that you will not be able to put a gasser into the air for lees than a MINIMUM of $2000, to do it right.

Not to discourage you, but these are just some things to think about. Good luck to you.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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09-12-2007 07:02 AM  10 years agoPost 7
haggy38

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Bogotá - Colombia

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Hi xcal, thanks for your advice, I been fliying 50´s at 15% of nitro with a lot of power, in addition we have a lot of plankers with Zenoah engines and it seems work fine, but I will do some more research, just in case, my budget would be about US$ 3.000 for all stuff. Thanks.

Regards,
Gustavo

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09-13-2007 01:41 AM  10 years agoPost 8
Billme

rrElite Veteran

MS

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I would get the Hanson 26max and run a Velosity stack at that altitude with the Predator SE and stock gearing 6.2, 710 blades... You'll need the extra head rpm to move more air...The velocity stack will concentrate the thinner air better also....
Bill

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09-13-2007 02:42 AM  10 years agoPost 9
BrunoBL

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Pomerode, SC, Brazil -26.71, -49.17

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I have never heard of this unit of measure could you explain (mts)?
He means 2640 meters (about 8660 feet).


...Bruno.
Spectra G on Avgas 100LL, Jewel generator
T-Rex450SE V2
DX7

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09-13-2007 05:13 PM  10 years agoPost 10
AceBird

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Utica, NY USA

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He means 2640 meters (about 8660 feet).
Yes Bruno, I figured it out. Some cultures swap the comma for the decimal point. Makes it kind of confusing.

Gustavo, if cash is not the problem (3 grand) then you might as well go for the modified 260 and the Condor version or stretched Predator so you can put longer blades on it. I am going to do an experiment with longer blades (810) and a stretched mast next season. I will let you know how it goes.

Ace
What could be more fun?

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09-13-2007 09:04 PM  10 years agoPost 11
haggy38

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Bogotá - Colombia

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Thank you all for the tips.

Regads,
Gustavo

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09-13-2007 09:41 PM  10 years agoPost 12
FloridaHeli

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jacksonville, florida

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Gustavo,

I have a Predator with aluminum frame. It is a bit heavy at 13.8lbs but can do light 3D.

It has a Zenoah 231 stock engine. What brought the engine to life was replacing the stock muffler with a Century V2 tuned pipe with restrictor for the 231. I have a friend with a Spectra G who has had the Zenoah 260 pro modified by BH Hansen. It screams! However, based on your description of how you fly I don't think you need all that power. The V2 is the older tuned pipe. Century now has a V3 that is quieter and gives a little more power. I'm sure this set up will save you $$ and still give you what you need for your style flying. I use the highest octane gas I can get with 3.5 oz Amsol oil per Gallon.

I have no idea what your altitude will do, living in Florida I'm at sea level and get all that there is with the dense air here.

If you are not doing 3D you could use a Futaba GY-401 gyro. I do have a GY-611 on my Predator but since you are flying around gently you really don't need the precision of the 611.

The JR 8311 servos that tlankford01 recommends are great. I have them on all my helis.

I like a governor and have a Futabe GV-1 on board. You really don't need a governor but I even have one on my Ecureuil scale heli. Just like the feel of having the engine at a constant speed when inputting collective.

Good luck and have fun. I hope you enjoy your Predator as much as I have.
Good luck and hope you enjoy the Gasser.

This hobby is WAY too expensive!!

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09-14-2007 02:05 AM  10 years agoPost 13
haggy38

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Bogotá - Colombia

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Hi FloridaHeli:

I´m 2640 meters above the sea so is a high altitude city, Bogotá Colombia, so we will see if the bird flights. What about the Tx, should be the DX7?

Regards,
Gustavo

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09-14-2007 11:54 AM  10 years agoPost 14
tlankford01

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Amarillo, TX 79110

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I use a DX7 because the technology to not have a radio hit is there. I almost feel that it is irresponsible to use a radio that take a hit when the technology to put a 12-20 lbs (5-8kilo) machine in the air without risk of radio failure is there. This is in my own opinion. I have never dropped a signal using the dx7. There are people who will disagree with me and that is fine. There are even 2.4 ghz radios and modules that have more channels. I recommend using this band. If anyone would get rf noise on a heli it would be me. My gasser has a generator, carbon fiber blades, a second radio and reciever for my camera mount and a downlink and I get zero interference.

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09-15-2007 05:24 AM  10 years agoPost 15
FloridaHeli

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jacksonville, florida

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my Tx is a JR 9303 FM but the Xtreme Link module replaces the module in the back of the JR Tx. Works great and I did not have to replace my beloved JR 9303.

This hobby is WAY too expensive!!

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09-17-2007 03:30 AM  10 years agoPost 16
haggy38

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Bogotá - Colombia

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I will go for the DX7. Thanks.

Regards,
Gustavo

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09-17-2007 09:56 AM  10 years agoPost 17
tlankford01

rrApprentice

Amarillo, TX 79110

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Tom is right if you have a good module radio then just switch that out and you have more channels and still get the benefit of DSM.

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09-17-2007 11:24 AM  10 years agoPost 18
BrunoBL

rrKey Veteran

Pomerode, SC, Brazil -26.71, -49.17

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Tlankford01,
If anyone would get rf noise on a heli it would be me. My gasser has a generator, carbon fiber blades, a second radio and reciever for my camera mount and a downlink and I get zero interference.
At some point in the future I plan on having a downlink as well.

What band is your downlink on? I have been told that all 2.4Ghz wireless devices need to comply with the "look for an empty channel" protocol, but I think analog video transmitters don't strictly qualify as wireless devices in this context and may be exempt from the requirement.

I have also been told that even a proper 2.4GHz wireless transmitter operating on a designated free channel has the potential to overload the DSM receivers if operated at extreme proximity, as may be the case with an on-board downlink.

I have therefore considered using the 900MHz band for downlink. What are your thoughts? As you have a successful installation that is free from interference, I'd be interested in your thoughts on the subject.


...Bruno.
Spectra G on Avgas 100LL, Jewel generator
T-Rex450SE V2
DX7

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09-17-2007 03:01 PM  10 years agoPost 19
tlankford01

rrApprentice

Amarillo, TX 79110

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You can not use a 2.4 ghz down link with dsm. this is a long explanation but bear with me. The Down link has a wider bandwidth. Meaning that it cuts across multiple channels at the same time to deliver the a/v data. This will not interfere with your radio even though it is on a channel that gets cut across because the spektrum uses a coded channel between the reciever and transmitter so that even though the same channel is being used by a nearby device the reciever ignores the uncoded signals. However you will have lines on your video or other interference with your video. So I use 900mhz from Range Video. I get zero interference and I have never changed the channel on my downlink. That is my recommendation and we have had excellent results.

The question on wireless devices i can only say that I belive that it transmits its signal by radio therefore "wireless". The laws apply to the radio signal and not so much on the specific device I believe.

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09-17-2007 04:05 PM  10 years agoPost 20
BrunoBL

rrKey Veteran

Pomerode, SC, Brazil -26.71, -49.17

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Thanks for taking the time to reply.
When the time comes then, I'll stick to 900MHz.

While RF-communications devices are indeed wireless, in my previous reply I meant a subset of those, i.e the devices that adhere to the digital communications protocol used by 2.4GHz wireless modems and the like (our DSM radios included), as opposed to simpler, modulated carriers on 2.4GHz.

At any rate this is a moot point as it looks like I'll stay away from 2.4GHz downlink transmitters anyway.

Thanks again for your info.


...Bruno.
Spectra G on Avgas 100LL, Jewel generator
T-Rex450SE V2
DX7

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