a question for dave

[greenman407]

dave, in the most recent subcommitee news you spoke about a speed control called the viper 10. what caught my eye was the built in failsafe. can it be set to blow ballast if signal is lost? the reason i asked is because i cant operate a normal failsafe. for some reason when i turn off my radio to test it all the servos and speed control go crazy, like they have a mind of their own. thanks mark

[JWLaRue]

Hi Mark,

The failsafe in a

Hi Mark,

The failsafe in a speed controller is not capable of controlling the ballast system servo. While it provides a similar function, it only controls the setting of the speed controller itself. I don't remember the specific implementation of the Mtroniks, but upon loss of signal it either sets the speed controller to neutral or it just holds its current throttle position.

The behavior that you describe when turning off your radio is definitely odd. Can you remind me what kind of radio system you have?

-tnx,

Jeff

[bigdave]

Jeff is correct.
The failsafe

Jeff is correct.
The failsafe on the viper will turn the speed control off if the signal is lost so the boat or sub will not keep running. On a failsafe used for a sub it will take your servo to a preset position, or activate a valve in the case of a SES-3 with a built in failsafe. By chance are you using an Airtronics radio? They have had problems with failsafes. A PCM radio will not work with a failsafe either. BD.

[greenman407]

viper 10 failsafe question

hi jeff and dave, the radio i am using is the fm 4 channel hitec laser 4. its the same one that subtek supplys with its albacore. when you turn your transmitter off with the reciever still on the servos look like windshield wipers,back and forth, back and forth. this then causes the ballast tank servo to blow ballast,vent ballast, back and forth rapidly, thus my frustrations. when i installed a subtek failsafe in the sub under these circumstances it would not function at all. and i tried two of them. i have two of these radios on different frequencys and they both do the same thing. is there a better radio that i should try? mark

[lobo]

Ahhh!
I have a new Airtronics

Ahhh!
I have a new Airtronics V600.....it does exactly what greenman describes when I shut it down. In fact, instructions tell you to disconnect reciever power first, then transmitter.....and upon power up, transmitter power on first..then reciever!

If you do not, servos whack out & really put a load on components as I have found out.

What a POS Airtronic radios are!
I need to invest in a real setup I see!

[greenman407]

http://www.subcommittee.com/forum/icon_biggrin.gif one good thing about

one good thing about it however is thatif your sub does lose your signal it will be popping back to the surface in short order because the rapid movement of the servos will trip the ballast tank servo and release the gas. mark

[greenman407]

I recently aquired a new

I recently aquired a new radio off of Ebay
Its a Futaba 9CHP 1024 PCM. Being that its a computer radio its helped out taming this beast( X-tail Albacore). I got it for $188.00 and it included a reciever. Now when I turn off the radio no crazy stuff.At that point the built in failsafe kicks in. Much Much better. This is the old radio and reciever. Dont know what im going to do with it. Anybody got ten bucks?

[bigdave]

That is great! Good price

That is great! Good price too!!
My best friend has one and loves it. It is one of the only computer radios you can buy on 75MHZ. Most are 72MHZ.
I think the CAP-9, CAP-7 and Tracker-III are the only computer radios you can buy on 75MHZ without having one converted. BD.

[greenman407]

hi Dave. Tower hobbies has

hi Dave. Tower hobbies has RF modules for it for about 55.00 and recievers for it as well

[bigdave]

Yes that is another great

Yes that is another great feature about the CAP-9.
You can buy a new RF module and fly airplanes and run your boats on the same radio. BD.

[greenman407]

Never thought of that. I

Never thought of that. I hate moving crystals and recievers around. I like having each vehicle complete.

[Guest]

I recommend receivers with PPM

I recommend receivers with PPM pulse coding. These receivers use conventional PPM technology, but condition the receiver pulses to filter out spurious interference, they also have programmable failsafe on all channels.

They're inexpensive, use standard crystals, and they also 'learn' the specific transmitting signature of your radio set, which further reduces interference.

If ever there was a style of receiver designed for model sub use, these are it!

Look up Hyperion, Berg, Jeti MPD and Schulze for makers of these receivers.

I own the Hyperion HP-DSP8FS-40. Very small and very good, 8 channels for under thirty quid is a bargain. They don't seem to do U.S frequencies though- look at the Berg stuff on the same page.

http://www.aircraft-world.com/shopdispl ... +RECEIVERS

Andy

[greenman407]

yes , thanks Subculture. I

yes , thanks Subculture. I will look into it.