The A2A Simulations Community

"Come share your passion for flight"
It is currently Thu May 23, 2013 4:30 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 5 posts ] 
Author Message
PostPosted: Mon Jun 27, 2011 8:24 am 
Offline
Airman First Class

Joined: Mon Jul 26, 2010 1:51 pm
Posts: 97
Location: Germany
Quote:
When I fly the real thing, we use a pattern altitude of only 700 ft around here and if I were to close the throttle on the downwind leg abeam the threshold, I'd have to make a pretty steep , nose-down turn to make a landing from that height. Doable, but you have to be quick about it. The Accusim J3 from the same height will easily fly a proper base leg and final from 700 ft AGL.

When flaring the real airplane, speed bleeds off very rapidly and the Accusim Cub will retain its momentum a lot longer, or perhaps the induced drag in the model is a lot lower than the real thing. When the nose comes up on a real Cub, speed drops off drastically.


I read the above written be Aerco in another thread here in the forum. A german real and virtual Cub driver told about same observations. This A2A Cub seems to flare too long and might have an extaggerated glide ratio. When I read the review of the Accusim Cub in our german print magazine (FSMagazin), which has been also written by a real pilot, it was as well stated, that the overall performance lacks realism in this point.

I know that Accusim planes are recreated after real plane observations, but the fact that this part of the flightmodel has been tweaked twice with patches shows that this aspect has been or might still be something like a "weakness" of the whole package.

Don`t get me wrong, I love this Cub and I spend very much time with it but flying an Accusim plane means nothing else than looking for maximum realism.

I tried to increase the induced drag from 1.0 to 1.1 in the aircraft.cfg but this doesn`t seem to affect the glide ratio. In fact, the Cub feels like a sailing aircraft when it comes to the flare. You can float it along the runway what must be definetaly wrong when I hear any real Cub driver who tested the Accusim one.

_________________
"What a pity, in a way, that an aeroplane that can impart such a glorious feeling of sheer joy and beauty has got to be used to fight somebody", Geoffrey Wellum in "First Light"

Image
Intel I7-2600K OC @ 4,5 Ghz; 8 Gb RAM; nVidia570


Top
 Profile  
 
PostPosted: Mon Jun 27, 2011 11:18 am 
Offline
Technical Sergeant
User avatar

Joined: Thu Dec 31, 2009 2:19 am
Posts: 883
Bochumer, the published numbers for the real Cub's glide ratio is 12:1. So it'll go 12 feet for every foot lost. So at 700 feet the cub should glide 8400ft or 1.38NM.

I did some tests, flying the cub at it's best L/D the best I got was 10:1. But this was engine at idle.
I would say the cub is pretty realistic.
And for comparison, A competition glider is 80:1, 747 17:1, 172 7.5:1.

_________________
Image


Top
 Profile  
 
PostPosted: Mon Jun 27, 2011 4:32 pm 
Offline
Staff Sergeant

Joined: Mon Jan 31, 2011 1:47 am
Posts: 494
Defending his point, though, that's just numbers... Flaring will put the plane way outside glide conditions so the rapid loss of speed makes sense under those conditions and with the wing it has. That type of airfoil will make a decent amount of drag even before it stalls... :P

_________________
Image Image Image


Top
 Profile  
 
PostPosted: Mon Jun 27, 2011 10:44 pm 
Offline
Technical Sergeant
User avatar

Joined: Thu Dec 31, 2009 2:19 am
Posts: 883
Well going back to the numbers. What speed are you flying base and final at? I only drift down the runway if I come in too fast, or have poor speed control. I don't know the Cub seems right to me. But I've never flown a real Cub just a Champ.

_________________
Image


Top
 Profile  
 
PostPosted: Tue Jun 28, 2011 1:39 am 
Offline
Airman First Class

Joined: Mon Jul 26, 2010 1:51 pm
Posts: 97
Location: Germany
Leaving numbers and coming to the right "feel", maybe it is worth taking a look at the conditions during the flare. Here, glide ratios are not useful for comparisons because induced drag changes with increasing angle of attack. Many, I could say everyone who flies or flew a real Cub and commented on the A2A is not convinced by the way this Cub floats and flares - except A2A themselves.

_________________
"What a pity, in a way, that an aeroplane that can impart such a glorious feeling of sheer joy and beauty has got to be used to fight somebody", Geoffrey Wellum in "First Light"

Image
Intel I7-2600K OC @ 4,5 Ghz; 8 Gb RAM; nVidia570


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group