Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Magnum with no throttle servo

Reply

Old 06-25-2003, 01:44 AM
  #1  
Mattyb
Senior Member
Thread Starter
 
Join Date: Mar 2003
Location: Australia
Posts: 275
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

is anyone flying the magnum without throttle servo to save weight. just wondering as i noticed that on the 50v1 the throttle is held open by spring. and the idea is to go flat out anyway so who needs it ??????


Mattyb
Mattyb is offline  
Reply With Quote
Old 06-25-2003, 03:53 AM
  #2  
Crazy4Flight
My Feedback: (540)
 
Crazy4Flight's Avatar
 
Join Date: Sep 2002
Location: Milford, MI
Posts: 3,014
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

specs on hitek HS-81:

Motor Type 3 Pole Ferrite
Bearing Type None
Torque 4.8/6.0v 36 / 42 oz. 2.6 / 3.0 kg.
Speed 4.8/6.0v 0.11 / 0.09 second
Size 1.2 x 0.5 x 1.2" 30 x 12 x 30 mm
Weight Nylon 0.58 oz. 16.6 g.

have you ever handlaunched one of these ???
have you considered the possibility that you may have flutter, lose a control surface in flight, servo failure, midair collision.????

would you now like to throttle back instead of going in full bore?

at 3.5 lbs the micro servo will increase your weight by about 1%

the pylon racers running venturi instead of a carb sill have a way of killing the engine...part of the rules.


if you want to make your magnum faster clean up the airframe...
all the blunt trailing edges on the tail are drag city
Crazy4Flight is offline  
Reply With Quote
Old 06-25-2003, 04:12 PM
  #3  
Cactus.
Senior Member
My Feedback: (1)
 
Cactus.'s Avatar
 
Join Date: Dec 2001
Location: CamborneCornwall, UNITED KINGDOM
Posts: 6,136
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

i run a GRRT, no throttle, i now have a cut, but i didnt before, talk about praying nothing goes wrong.......
Cactus. is offline  
Reply With Quote
Old 06-25-2003, 11:20 PM
  #4  
Mattyb
Senior Member
Thread Starter
 
Join Date: Mar 2003
Location: Australia
Posts: 275
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

i see your point. after starting it the other night i would not like to have no throttle. barely hang onto it
Mattyb is offline  
Reply With Quote
Old 06-25-2003, 11:22 PM
  #5  
jwoolridge
Senior Member
 
Join Date: Mar 2003
Location: St John\'s, NF, CANADA
Posts: 140
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

How do engines with a venturi kill the throttle in an emergency.
James
jwoolridge is offline  
Reply With Quote
Old 06-26-2003, 12:18 AM
  #6  
Rudeboy
 
Rudeboy's Avatar
 
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,508
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

I used to use a fuel line pinch in the past...

Nelson engines have a venturi, but it looks like a carb... you can close the barrel to stop the engine...
Rudeboy is offline  
Reply With Quote
Old 06-26-2003, 07:29 PM
  #7  
Cactus.
Senior Member
My Feedback: (1)
 
Cactus.'s Avatar
 
Join Date: Dec 2001
Location: CamborneCornwall, UNITED KINGDOM
Posts: 6,136
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Magnum with no throttle servo

you start a turn rich, it runs like a bag of $*** till you get to the patch, lean it out and throw. i now have a little hook round some tube and it pulls it tight against the fire wall to cut, i've not tried it yet, waiting for a pipe, but i may even be able to sort out a rich setting in air by pinching it slightly
Cactus. is offline  
Reply With Quote

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