Yellow F-14 Tomcat Question(s)
08-11-2004, 07:31 AM
#27
RE: Yellow F-14 Tomcat Question(s)
Unfortunately, I don't have a server to make this video clip available. I do have video of a JETMART kit converted to twin JF50 BEES which flies very well. Please note, the JETMART kit is 1/10 scale. the Y/A is 1/9. Given the larger scale on the yellow kit, fuel space should NOT be a problem, BUT GO WITH SMALL ENGINES!!!! I'll gladly email this video clip to whoever wants it. The file is about 11megs.
08-11-2004, 10:52 AM
#29
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RE: Yellow F-14 Tomcat Question(s)
ORIGINAL: tomcatman
...The center of lift being further aft, makes the aircraft much more sensitive to roll. Upon sweeping the wings, low rates on the control surfaces are simultaneously selected, but even in swept mode, it is a very fun airplane to fly...
...The center of lift being further aft, makes the aircraft much more sensitive to roll. Upon sweeping the wings, low rates on the control surfaces are simultaneously selected, but even in swept mode, it is a very fun airplane to fly...
Tomcatman,
Just a small correction. The shift in the center of pressure actually has nothing to do with the roll sensitivity. The roll becomes sensitive with wings swept as a result of less inertia to overcome. Turning an aircraft with a wing span of 57" requires more control authority than an aircraft with a wing span of 34" simply because there is less "drag" you have to overcome in the roll. Does that make sense? A sailplane with a high aspect ratio wing will always require a whole bunch more control authority in roll than say an F-104 with tiny wings. The cp shift only changes the trim point of the airplane. In the case of the F-14, the result is a slight nose down pitching moment. Set your cg in a good nominal position and you will only get a very slight change in pitch. The rest (if necessary) can be programmed into the radio.
Chris
08-11-2004, 11:50 AM
#30
RE: Yellow F-14 Tomcat Question(s)
Thanks for the input Chris!!! Truthfully, in my experience, a CG further aft of where it should, but no so far back that the plane becomes unflyable, tends to cause a tendency to roll faster. This also adds to "TIP STALLING" at slower airspeeds. Add to that the lower aspect ratio of an F-14 in swept mode...well, I think you know where i'm going with this. However, you are absolutely correct provided all the aforementioned parameters are correct. By the way, I sent that video clip of the JETMART F-14 converted to a pair of JF50 BEES to Sean who will be uploading them to this thread for all to see ( I don't have a server). I actually found that clip here on RCU. It was in 2 parts, but the second part of it (the actual whole flight) is about 93megs and too large for me to email so subsequently, I only have the 1st part (the takeoff) available. If you do a search for it, you should be able to find it. THANKS SEAN!!
08-11-2004, 08:44 PM
#36
RE: Yellow F-14 Tomcat Question(s)
Way to go Sean!!! Yes, download speed is just a tad on the slow side, but not too bad overall. I also have the other clip. I noticed that the gear is a bit on the long side to be scale and the jet is also missing the video pod under the nose..but it's still a fantastic example of a turbine powered Tomcat!!! Always a Tomcat fan!!! Thanks again Sean.
08-11-2004, 09:16 PM
#37
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RE: Yellow F-14 Tomcat Question(s)
Very cool! I have seen those videos before a long time ago. I cant believe how smooth the 14 rotated on the first video! Gotta love the Tomcat.
Who owns those planes? What kits are they?
Who owns those planes? What kits are they?
08-12-2004, 03:54 AM
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RE: Yellow F-14 Tomcat Question(s)
This CAT kit's could b a similar one on JET TEAM LIEBETRAU site's-[sm=confused.gif]
1/7.5 2.55 in length....
re video clip was taken during Jet Meeting Enns 5/28/2004
if you want to see more pictures of this GIANT CAT, login to Austria site's
regards
albert
www.asiascalerc.com
1/7.5 2.55 in length....
re video clip was taken during Jet Meeting Enns 5/28/2004
if you want to see more pictures of this GIANT CAT, login to Austria site's
regards
albert
www.asiascalerc.com
08-12-2004, 05:25 AM
#41
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RE: Yellow F-14 Tomcat Question(s)
Should b able to see them at http://www.jets.at/start.html
scroll down to GALLERY on right hand corner! GOOD LUCK [sm=wink.gif]
Re-routing charges is payable in USD$
best regards
albert /AsiaScale RC
scroll down to GALLERY on right hand corner! GOOD LUCK [sm=wink.gif]
Re-routing charges is payable in USD$
best regards
albert /AsiaScale RC
08-17-2004, 12:57 PM
#42
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RE: Yellow F-14 Tomcat Question(s)
Tomcatman,
There are two distinct differences in the full-scale F-14 flying qualities between swept and unswept wings. Wings out, roll is sluggish and pitch is "normal". Sweeping the wings results in VERY responsive roll (differential stab only, no spoilers at full sweep) and VERY stable pitch. I don't remember the exact aerodynamics but the change in pitch sensitivity is directly related to the change in the relationship between the centers of pressure and gravity with sweeping of the wings. I believe the change in roll sensitivity is indeed due simply to the change in the moment of inertia in the roll axis.....like figure skaters changing the outstretch of their arms while spinning.
Great videos, guys! I have an old, somewhat beat up Yellow F-14 that I'm planning to refurbish next year. I am seriously considering using two of the old Golden West FD-3/67 engines. They're perfect replacements for OS 91/Dynamax/Ramtec installations. The Yellow Tomcats that I've observed with DF power flew realistically with excellent authority. If and when I get around to the rebuild I will certainly keep you guys posted.
Tom
There are two distinct differences in the full-scale F-14 flying qualities between swept and unswept wings. Wings out, roll is sluggish and pitch is "normal". Sweeping the wings results in VERY responsive roll (differential stab only, no spoilers at full sweep) and VERY stable pitch. I don't remember the exact aerodynamics but the change in pitch sensitivity is directly related to the change in the relationship between the centers of pressure and gravity with sweeping of the wings. I believe the change in roll sensitivity is indeed due simply to the change in the moment of inertia in the roll axis.....like figure skaters changing the outstretch of their arms while spinning.
Great videos, guys! I have an old, somewhat beat up Yellow F-14 that I'm planning to refurbish next year. I am seriously considering using two of the old Golden West FD-3/67 engines. They're perfect replacements for OS 91/Dynamax/Ramtec installations. The Yellow Tomcats that I've observed with DF power flew realistically with excellent authority. If and when I get around to the rebuild I will certainly keep you guys posted.
Tom
