Go Back  RCU Forums > RC Airplanes > Giant Scale Aircraft - 3D & Aerobatic
Reload this Page >

Smart fly optical ignition cutoff setup

Notices
Giant Scale Aircraft - 3D & Aerobatic Discuss all your 3D & Aerobatic giant scale airplanes right here!

Smart fly optical ignition cutoff setup

Old 04-07-2005, 11:27 PM
  #1  
flyinrazrback
Thread Starter
My Feedback: (69)
 
flyinrazrback's Avatar
 
Join Date: Jul 2002
Location: Fort Smith, AR
Posts: 3,779
Likes: 0
Received 0 Likes on 0 Posts
Default Smart fly optical ignition cutoff setup

I just got one of the kill switches from smart fly. Just a general setup question to make sure i have it right. I have the battery plugged into the switch, switch going to regulator, regulator going to ignition. I plug in the kill switch in between the regulator and the ignition box, correct? (I plugged in the kill switch inbetween the battery and the switch, and the light works, but dont think that is correct)
Old 04-07-2005, 11:45 PM
  #2  
quist
My Feedback: (198)
 
quist's Avatar
 
Join Date: Jan 2002
Location: Glendale, AZ
Posts: 3,327
Received 9 Likes on 5 Posts
Default RE: Smart fly optical ignition cutoff setup

I went battery,switch,cutoff, regulator, ignition. there is a little bit of draw on the cutoff so it has to be on the other side of the switch so it doesn't drain the battery.

I am thinking of elimanating the ignition switch all together. The ignition will only work if the reciever has a signal. I also used Aux 4 as the channel on my 10X. This put it on a dial instead of a switch, this way it makes it more difficult to accidently kill the engine.
Old 04-08-2005, 12:39 AM
  #3  
flyinrazrback
Thread Starter
My Feedback: (69)
 
flyinrazrback's Avatar
 
Join Date: Jul 2002
Location: Fort Smith, AR
Posts: 3,779
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

Ok thanks, I set it up as you mentioned, works fine now.
Old 04-08-2005, 11:53 PM
  #4  
TT2
Senior Member
My Feedback: (13)
 
Join Date: Mar 2002
Location: Osborn, MO
Posts: 648
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

I am thinking of elimanating the ignition switch all together.
I'm not the safety police, but what would happen if your engine was running on the ground and you lost your receiver or Rx packs? How would you kill the engine?

-Tom
Old 04-09-2005, 08:22 AM
  #5  
A320driver
Senior Member
My Feedback: (1)
 
Join Date: Feb 2003
Location: phoenix, AZ,
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

In reply to TT2. If you lose the signal or the power to the RX the Smart-fly unit will automatically cut off the power to the ignition unit.
Old 05-05-2005, 03:17 PM
  #6  
famousdave
Senior Member
My Feedback: (61)
 
Join Date: Sep 2003
Location: Bradenton , FL
Posts: 2,262
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

ORIGINAL: quist

I went battery,switch,cutoff, regulator, ignition. there is a little bit of draw on the cutoff so it has to be on the other side of the switch so it doesn't drain the battery.

I am thinking of elimanating the ignition switch all together. The ignition will only work if the reciever has a signal. I also used Aux 4 as the channel on my 10X. This put it on a dial instead of a switch, this way it makes it more difficult to accidently kill the engine.

I haven't used an ignition switch for a while now. I also have only used the optical cut off only once. The rest of my planes have gotten an RCATS standard relay cut-off. I have never had an RFI problem with it and its only $19 bucks.

DP
Old 05-05-2005, 03:56 PM
  #7  
canavanbob
My Feedback: (20)
 
canavanbob's Avatar
 
Join Date: Apr 2003
Location: Buena Park, CA
Posts: 365
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

dp,
I have also used the RCATS ignition cutoff on several planes. Works great!
However, my son had a crystal go bad right after landing. The ignition didn't
cut off.
Bob
Old 05-05-2005, 05:48 PM
  #8  
famousdave
Senior Member
My Feedback: (61)
 
Join Date: Sep 2003
Location: Bradenton , FL
Posts: 2,262
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup


There are conditions in which no matter what the cut-off wont work! If the RX goes into a crazy state (i.e. the processor fails or some other catastrophic failure - but it retains power, the cut off will be rendered useless and the ignition will remain hot while the plane heads for impending doom. If the RX goes into freq lockout, programming the fail-safe feature to cut that channel would immediately kill the engine.

At a minimum the fail-safe should always be programmed to cut the throttle servo to a bit above idle so it can't fail in WOT under any but the most extreme circumstances. The kill switch should only be a backup.

In the case of the bad crystal, if the RX had fail safe and was programmed correctly, the engine would have at least cut to idle.

I never program my cut-off to change states in fail-safe. Bad enough I ever get a temporary lockout - I don't need a dead stick right after recovering from it!! I set my throttle fail safe to a high idle on lockout.

Of course all this assumes you have a PCM system or at least a programmable throttle servo (Hitec) .

DP
Old 05-06-2005, 01:35 PM
  #9  
canavanbob
My Feedback: (20)
 
canavanbob's Avatar
 
Join Date: Apr 2003
Location: Buena Park, CA
Posts: 365
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Smart fly optical ignition cutoff setup

dp,
That was our conclusion. The rudder went hard right and the throttle went to high idle. It slowly rolled into the fence and broke the prop, no other damage.
Bob

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.