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Old Yesterday, 08:23 AM
Airplane and Heli Flyer
V-Man's Avatar
Canada, QC, Montreal
Joined Dec 2009
1,616 Posts
Quote:
Originally Posted by FLOEY View Post
With some sanding (had to do it any way to align fan correctly) I installed a modified
Kyosho DF-55 in my F-8 Crusader (another difficult Angel).
I got a Crusader in the mail on its way here. I know it's a difficult bird, but it was cheap and I like to tinker.

Got a list of my own planned mods already but would be interested to hear about what you're doing to help the plane fly.
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Old Yesterday, 12:54 PM
Registered User
Norway
Joined Dec 2007
1,529 Posts
Quote:
Originally Posted by V-Man View Post
I got a Crusader i... help the plane fly.
From what I could figure out on my version: The stock fan is located
a bit offset to the thrust line and aligned with inlet duct not outlet duct.
This may cause the exhaust airflow to pitch up like some has reported.

See attached cross section sketch

COG at 84mm? Don't think so try this
http://rcwingcog.a0001.net/

I got a COG for "experts" at approx 107mm behind leading edge. Somebody
reported a successful COG at 108mm in my view that sounds like confirmed ...

I choose to set COG at 100mm from leading edge pretty conservative before
maiden. It flew but the wind was too strong today got to emergency land or
the plane would end up in the sea.
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Last edited by FLOEY; Yesterday at 01:06 PM.
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Old Yesterday, 01:00 PM
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Joe 1320's Avatar
United States, FL, Sebring
Joined Feb 2006
7,429 Posts
Quote:
Originally Posted by V-Man View Post
I got a Crusader in the mail on its way here. I know it's a difficult bird, but it was cheap and I like to tinker.

Got a list of my own planned mods already but would be interested to hear about what you're doing to help the plane fly.
The curved exhaust duct makes the plane want to roll and pitch up with throttle. The best fix is to add a functional rudder. It takes a hard LEVEL throw to get it on step quickly and the rudder keeps things in line.
It will flat spin if you stall it. No hope of recovery without a rudder.
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Old Yesterday, 01:07 PM
chuck
santa barbara, CA
Joined May 2009
4,132 Posts
Quote:
Originally Posted by green_flyer View Post
Grippen looks really good!
I tried my AMX with the lighter 47g 500mah 3s battery, but it was not happy, tail heavy I think, with cog 120mm from intake. The problem is probably its warped wings, warped upwards at the tips. No video, sorry, there were some fun hand launches into the ground
I'll try it again with the original battery 76g 850mah 3s, seemed to fly almost ok with that one.
my amx w/ tailerons only on 1000 4 cell is one of the best i own, but it is straight and as fast as it is warps would be bad. does not seem like it would launch well w/ marginal power w/ so little wing area. on the stock fan on 4's the launch is a non event at 5/8-3/4 power.

chuck.
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Old Yesterday, 01:17 PM
Airplane and Heli Flyer
V-Man's Avatar
Canada, QC, Montreal
Joined Dec 2009
1,616 Posts
Quote:
Originally Posted by FLOEY View Post
From what I could figure out on my version: The stock fan is located a bit offset to the thrust line and aligned with inlet duct not outlet duct. This may cause the exhaust airflow to pitch up like some has reported.
Heard about that and planned to open the fuselage to check. Thanks for the visual, it helps.

Quote:
COG at 84mm? Don't think so
Heard about that one too. I will set mine at 100mm to start with.

Quote:
Originally Posted by Joe 1320 View Post
The curved exhaust duct makes the plane want to roll and pitch up with throttle. The best fix is to add a functional rudder.
I added a rudder to my Mig-15 and wouldn't fly without it. It makes nice, sweeping turns possible, with minimal energy losses. Planned to do the same on the Crusader. I'll be swapping the native servos for lighter ones, so the total weight should not be affected.

I'm also planning to remove as much of the native paint job as possible, it looks heavy as heck.
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Old Yesterday, 05:23 PM
helter skelter
NOTAR 600's Avatar
Central Ohio
Joined Nov 2007
1,479 Posts
I've read the T-45 Goshawk is considered one of the better airframes and maybe the F-16 as well if it's kept light.
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Old Yesterday, 05:28 PM
helter skelter
NOTAR 600's Avatar
Central Ohio
Joined Nov 2007
1,479 Posts
How about the A-4F Skyhawk? Is it a good flyer? It looks good in videos at least.
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Old Yesterday, 05:29 PM
nom
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nom's Avatar
United States, ID, Boise
Joined Mar 2011
1,621 Posts
Both are great airframes. The F16 is faster while the T45 is a versatile airframe.
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Old Yesterday, 10:18 PM
What Goes Up...Must Come Down
abjets's Avatar
United States, NC, Oak Island
Joined Jan 2013
789 Posts
Agreed with Nom...F-16 is wonderful in a vast speed range and a blast to fly, T-45, while a bit slower, does everything exceptionally well and looks great doing it. I love my F-86 stock motor 6B fan on 4S...pretty fast and looks great in the air...can be a bit finicky if you don't fly it like a jet. Screamer rocks! Fast, slow, whatever you want, but it isn't really scale.
Just finishing my F-18 and have an AMX, T-33, and my favorite L-39 to build...less work and more play needed :-)
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Old Yesterday, 11:25 PM
Yeah, I can fly...
wyldkrd's Avatar
Mesa, Arizona
Joined Jun 2005
2,513 Posts
Quote:
Originally Posted by NOTAR 600 View Post
How about the A-4F Skyhawk? Is it a good flyer? It looks good in videos at least.
Thumbs up on the A-4. I have one running the 6-blade rotor, stock motor 40a esc on 1000 4s 40c. I also installed a steerable nosewheel using the PZ corsair tail wheel. I hold my own with the hopped up T-45's and F-16's the guys in my club fly.
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Old Yesterday, 11:26 PM
Yeah, I can fly...
wyldkrd's Avatar
Mesa, Arizona
Joined Jun 2005
2,513 Posts
Quote:
Originally Posted by V-Man View Post
I got a Crusader in the mail on its way here. I know it's a difficult bird, but it was cheap and I like to tinker.

Got a list of my own planned mods already but would be interested to hear about what you're doing to help the plane fly.
If you want a spare like new wing for the crusader let me know
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Old Today, 02:52 AM
Registered User
Norway
Joined Dec 2007
1,529 Posts
Quote:
Originally Posted by Joe 1320 View Post
The curved exhaust duct makes the plane want to roll and pitch up with throttle. The best fix is to add a functional rudder.
.
.
Thanks I hope to have cured this but I will probably add rudder too.

My 2nd maiden attempt today did not go well the fan shaft cracked (car BL motor
with 2,3mm shaft ... ). I've experienced that before but after many flights ...
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