Notices
Scratch Building, Aircraft Design, 3D/CAD If you are starting/building a project from scratch or want to discuss design, CAD or even share 3D design images this is the place. Q&A's.

design help

Old 01-31-2002, 03:53 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Jan 2002
Location: Ashland City, TN
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default design help

I have finnished my first true scrach built model and I need help. I have built models from plans but this is my design. This is a 1/2a design with a norvel .061. It is a fun fly design with a 27" ws, 7.5" cord, and 15% airfoil. It kind of looks like a competion fun-fly. It has oversized control surfaces and weighs about 18oz. I thought I would have near vertical performance with this little plane BUT NO!! It stuggles to gain altitude. At full throttle it flys a litte faster than a park flier. I have tried a 6-2, 5.7-3, and 5-3 props and the 5-3 seems to work the best with a little more speed, but still is very hard to do a loop. Here is the question: Do I just need a larger engine? (this plane weighs 18oz!!)
Is the airfoil too thick and causing too much drag??
Might I have a problem with my incidences??

Thanks for all the help
Old 01-31-2002, 12:01 PM
  #2  
Senior Member
 
Join Date: Dec 2001
Location: Punta Gorda, FL
Posts: 958
Likes: 0
Received 0 Likes on 0 Posts
Default Power Loading

Your power loading is way too high for vertical performance. A hot 0.10 cid or a sport 0.15 cid engine will give you vertical performance.
Old 02-02-2002, 04:05 AM
  #3  
Senior Member
 
Join Date: Jan 2002
Location: Oregon sometimes, Washington Sometimes
Posts: 321
Likes: 0
Received 0 Likes on 0 Posts
Default design help

Try the Norvel .074 it has the power of a .10 and weighs only 2 oz

-Paul
Old 02-02-2002, 06:51 AM
  #4  
Senior Member
 
Join Date: Dec 2001
Location: Punta Gorda, FL
Posts: 958
Likes: 0
Received 0 Likes on 0 Posts
Default Power Loading

Small engines run best with high nitro fuel. Fifteen percent nitromethane is not too much.
Old 02-03-2002, 03:47 PM
  #5  
Junior Member
Thread Starter
 
Join Date: Jan 2002
Location: Ashland City, TN
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default design help

Thanks for the help. Ollie is right. I was running 10% and just did not have enough power. I borrowed some 25% today and what a difference!! I don't have unlimited vertical but it now climbs with athority and is very fun to fly. I still think it would be fun to try the .074 though.
Old 02-03-2002, 07:15 PM
  #6  
Senior Member
 
Join Date: Jan 2002
Location: Oregon sometimes, Washington Sometimes
Posts: 321
Likes: 0
Received 0 Likes on 0 Posts
Default design help

Stuck, one of my buddies, is going to do a fun fly with the .074 soon. He goes by the name of Foamguy, you can find him in the Fun Fly forum.

--Paul

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
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Thread Tools
Search this Thread

Contact Us - Manage Preferences 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.