Notices
Questions and Answers If you have general RC questions or answers discuss it here.

SR71 blackbird

Old 02-24-2007, 07:29 AM
  #1  
meljoyviegas
Junior Member
Thread Starter
My Feedback: (22)
 
Join Date: Dec 2004
Location: Dededo, GUAM (USA)
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default SR71 blackbird

I had purchase a 46 size SR71 blackbird and had installed an OS 46 motor with a 10x8 APC prop. When I flew it and it flew like it needed a larger size engine. Should I change it out to an OS 50 or just change out the prop to a 10x6? Anyone out there wants to share there experience would really appreciate it.
Old 02-26-2007, 12:51 AM
  #2  
supi7
Member
My Feedback: (2)
 
supi7's Avatar
 
Join Date: Feb 2004
Location: Chicago, IL
Posts: 74
Likes: 0
Received 0 Likes on 0 Posts
Default RE: SR71 blackbird

You have to tell us a bit more about what you expect from this model. For everyone performance can feel diffrent.

What did this motor lack? Is it speed? Maneuverability? Not enough power for takeoff?

Changing a motor is a good idea but first I would try to find out what the .46 can handle in terms of switching prop size.

As far as your electric question, a 4130-7 with a 8S 4000mAh pack and a 10size prop will get that Jet moving, nice and quiet as they were meant to fly

This may be a little too powerfull but then again Jets are meant to go fast.

If this model is in 5lb range the TowerPro 3520-7 motor with a 5S 4000mAh would also work great.

http://www.rcuniverse.com/market/item.cfm?itemid=265212
this model is very nice but the seller fails to mention the weight, can you tell us what it is? Engine and all.


Best Wishes,
Dan
TrueRC
Old 02-26-2007, 09:27 AM
  #3  
aeajr
My Feedback: (2)
 
aeajr's Avatar
 
Join Date: Jan 2003
Location: Long Island, NY
Posts: 8,573
Likes: 0
Received 11 Likes on 11 Posts
Default RE: SR71 blackbird

ORIGINAL: meljoyviegas

I had purchase a 46 size SR71 blackbird and had installed an OS 46 motor with a 10x8 APC prop. When I flew it and it flew like it needed a larger size engine. Should I change it out to an OS 50 or just change out the prop to a 10x6? Anyone out there wants to share there experience would really appreciate it.
You have posted this in the electric aircraft section. In the future you would be better off posting in the the other, fuel based aircraft section.

I am going to move it for you.
Old 02-26-2007, 09:01 PM
  #4  
red head
 
Join Date: Feb 2005
Location: Zephyrhills, FL
Posts: 2,102
Likes: 0
Received 1 Like on 1 Post
Default RE: SR71 blackbird

Try an 11x5 or 11x6. ENJOY !!! RED
Old 02-27-2007, 10:01 AM
  #5  
meljoyviegas
Junior Member
Thread Starter
My Feedback: (22)
 
Join Date: Dec 2004
Location: Dededo, GUAM (USA)
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default RE: SR71 blackbird

The total weight of the plane together with an O.S. 46 is about 5.5 lbs. As for taking off. It goes quite a ways down the runway before it starts to rotate and take off. I tried using a 10x8 and a 10x6 prop with the OS 46 motor. It flew slightly better with the 10x6 but still slugish. As for a larger prop. Well the way the jet is built it only allow props no larger that a 10 inches. So the idea of a larger prop isn't going to work. Thanks for the helpful tips.
Old 02-27-2007, 10:20 AM
  #6  
ag4ever
Senior Member
 
Join Date: Oct 2004
Location: Richmond, TX
Posts: 298
Likes: 0
Received 0 Likes on 0 Posts
Default RE: SR71 blackbird

If it is an LA series OS engine, they just don't have the same power as other engines of the same size. What type engine is it?
Old 02-28-2007, 06:43 PM
  #7  
meljoyviegas
Junior Member
Thread Starter
My Feedback: (22)
 
Join Date: Dec 2004
Location: Dededo, GUAM (USA)
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default RE: SR71 blackbird

The engine is an O.S. 46 AX with a 10x6 prop. Flies okay, but just okay. My other warbirds (also 40 size) flys faster and better than the Blackbird with the same type of motor and prop.

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 - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.