Go Back   Knife Edge > RealFlight - Designer's Corner > RealFlight 7 - Designer's Corner
Use of this site is subject to our Terms of Use. | Looking for technical support? Read this!

Reply
 
Thread Tools Rate Thread Display Modes
  #61  
Old 04-02-2017, 07:24 PM
uncle twist's Avatar
uncle twist uncle twist is online now
Registered User
 
Join Date: Feb 2010
Posts: 2,120
Nice CS Legoman.
__________________
Why do today, what you can put off `till tomorrow
Reply With Quote
  #62  
Old 04-03-2017, 04:33 AM
doug schluter's Avatar
doug schluter doug schluter is offline
Registered User
 
Join Date: Dec 2007
Posts: 2,153
Send a message via AIM to doug schluter
Quote:
Originally Posted by legoman View Post
I did a repaint because I did not like the "Japanese navy flag" on the top of the wing.
are you going to put this CS on the swaps it looks really good legoman be nice to have it
Reply With Quote
  #63  
Old 04-03-2017, 08:39 AM
legoman's Avatar
legoman legoman is online now
Registered User
 
Join Date: Feb 2011
Location: SW, Florida
Posts: 1,575
Quote:
Originally Posted by uncle twist View Post
Nice CS Legoman.
Quote:
Originally Posted by doug schluter View Post
are you going to put this CS on the swaps it looks really good legoman be nice to have it
Posted Here
__________________
Even pigs and bricks will fly with enough thrust.
Reply With Quote
  #64  
Old 04-03-2017, 10:49 AM
doug schluter's Avatar
doug schluter doug schluter is offline
Registered User
 
Join Date: Dec 2007
Posts: 2,153
Send a message via AIM to doug schluter
got it thanks legoman
Reply With Quote
  #65  
Old 04-03-2017, 11:36 AM
BrokeDad's Avatar
BrokeDad BrokeDad is offline
Registered User
 
Join Date: Dec 2014
Posts: 1,790
Thanks too legoman.
Reply With Quote
  #66  
Old 04-06-2017, 06:24 PM
GunHead's Avatar
GunHead GunHead is offline
Registered User
 
Join Date: Sep 2014
Location: Prievidza, Slovakia
Posts: 60
Quote:
Originally Posted by BrokeDad View Post
This is twice the size and weight of the original. I thought I'd put it here first and get any feedback. Many changes have been made technoid since the first version I sent you.
Hello.

May I please ask you a question? (And may be start some debate about airplane resizing)
Why do you doubled the weight of the model, if you resized it to twice its original size? Am I missing some point? If I got it right, then if you resize the model twice its original size, the new wing area will be four times bigger then original wing area and if the all parts are consistently doubled in size, their volume will be even eight times bigger. So in case that you use the same materials as original (with same specific weight), then weight of the model should be eight times bigger. Well, almost eight times, because you will certainly optimize the parts of construction in real world.
Maybe you are somehow counting with airfoil polars used for computing in te RealFlight. I think that probably the simulation engine is not using specific polars for different reynolds numbers. Anyway, if you double the size of MAC in real world, the Re will be doubled too and lift and drag coeficients will be better. It coud be interesting to know for what Re number the polars used in RF are measured/counted.

Please, do not get me wrong. I do not want to criticize, I try to understand.
Reply With Quote
  #67  
Old 04-06-2017, 07:11 PM
csgill75's Avatar
csgill75 csgill75 is offline
Registered User
 
Join Date: Mar 2009
Location: Florence, Alabama
Posts: 3,422
This is why you have to cheat in the physics for realistic flying physics. Realflight does a excellent job replicating 1:1 RC aircraft physics but doesn't work well when people try to make the aircraft larger. You are correct about the wing area multiplying, and it is felt in the physics by making the model seem to float. It's overcome by reducing the amount of lift the lifting element makes.

I've learned from people who actually fly 1/3 and 1/2 scale aircraft that the weight is actually very light. A 1/2 scale WWI fighter weights 20-25lbs. This is a aircraft with a 11ft wingspan and gas motor. That is flying with a full fuel tank. We made some AV's that fly very similar but weight had to be increased slightly. I believe 40lbs was the heaviest model of the 1/2 scale Gotha bomber which is a huge aircraft but is a real flying model.

People who make aircraft half the weight of the full scale aircraft often make this mistake. They think of realflight as a full size aircraft simulator and it clearly isn't.
Reply With Quote
  #68  
Old 04-06-2017, 07:20 PM
technoid's Avatar
technoid technoid is online now
Registered User
 
Join Date: Oct 2014
Location: Texas
Posts: 5,789
Quote:
Originally Posted by legoman View Post
I did a repaint because I did not like the "Japanese navy flag" on the top of the wing.
OPPs.. Somehow I forgot to comment on this. Very nice I like it a lot! I was just collecting a few pictures of the Christen Eagle a few days ago.
Reply With Quote
  #69  
Old 04-07-2017, 09:21 AM
technoid's Avatar
technoid technoid is online now
Registered User
 
Join Date: Oct 2014
Location: Texas
Posts: 5,789
I just uploaded the Great Lakes Special Float version.. enjoy!
Reply With Quote
  #70  
Old 04-07-2017, 09:39 AM
doug schluter's Avatar
doug schluter doug schluter is offline
Registered User
 
Join Date: Dec 2007
Posts: 2,153
Send a message via AIM to doug schluter
thanks technoid , i finally got to finish my color scheme on the Great Lakes biplane , i am flying this float version and having lots of fun with it
Reply With Quote
  #71  
Old 04-07-2017, 10:38 AM
technoid's Avatar
technoid technoid is online now
Registered User
 
Join Date: Oct 2014
Location: Texas
Posts: 5,789
Quote:
Originally Posted by doug schluter View Post
thanks technoid , i finally got to finish my color scheme on the Great Lakes biplane , i am flying this float version and having lots of fun with it
Cool.. you got it back and finally completely finished
Reply With Quote
  #72  
Old 04-07-2017, 06:13 PM
BrokeDad's Avatar
BrokeDad BrokeDad is offline
Registered User
 
Join Date: Dec 2014
Posts: 1,790
Thumbs up Floats !!

Thanks for making us a water version. Now I can park at unpopulated islands and shores.
If you ever stop making new planes I'm gonna have withdrawal symptoms. I have the double size version flying great now to my liking with some tips from CSgill75. It has much less float and an appropriate stall speed. I guess I will work on a double size float version this weekend between real heli flying outside.

Last edited by BrokeDad; 04-08-2017 at 10:11 AM.
Reply With Quote
  #73  
Old 04-09-2017, 03:02 PM
BrokeDad's Avatar
BrokeDad BrokeDad is offline
Registered User
 
Join Date: Dec 2014
Posts: 1,790
Finished up the double sized float version today Did some very simple color schemes.
Reply With Quote
  #74  
Old 04-09-2017, 07:07 PM
Ron6234's Avatar
Ron6234 Ron6234 is offline
Registered User
 
Join Date: May 2007
Posts: 300
BrokeDad are you going to put the double sized float version on the swaps and also the color schemes, I would love to have them! THANKS
Ron
Reply With Quote
  #75  
Old 04-10-2017, 02:04 PM
GunHead's Avatar
GunHead GunHead is offline
Registered User
 
Join Date: Sep 2014
Location: Prievidza, Slovakia
Posts: 60
Quote:
Originally Posted by csgill75 View Post
This is why you have to cheat in the physics for realistic flying physics. Realflight does a excellent job replicating 1:1 RC aircraft physics but doesn't work well when people try to make the aircraft larger. You are correct about the wing area multiplying, and it is felt in the physics by making the model seem to float. It's overcome by reducing the amount of lift the lifting element makes.

I've learned from people who actually fly 1/3 and 1/2 scale aircraft that the weight is actually very light. A 1/2 scale WWI fighter weights 20-25lbs. This is a aircraft with a 11ft wingspan and gas motor. That is flying with a full fuel tank. We made some AV's that fly very similar but weight had to be increased slightly. I believe 40lbs was the heaviest model of the 1/2 scale Gotha bomber which is a huge aircraft but is a real flying model.

People who make aircraft half the weight of the full scale aircraft often make this mistake. They think of realflight as a full size aircraft simulator and it clearly isn't.
I am sorry for asking you one more time, but are you sure about the Gotha bomber? I have only found this one (http://www.modelairplanenews.com/blo...-gotha-bomber/) on internet somehow similar to one you mentioned, but this one is only quarter scale and its weight is more then 50 pounds. Don't you have some link or something to the one you mentioned please. It is very interesting to me because it looks like very light construction.

Thank you and have a nice day.
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Forum Jump


All times are GMT -4. The time now is 06:57 PM.