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Yes nice notice how smooth the surfaces areNice shots indeed!
Extremely important information! Thank you I did not know this . It creates a n interesting situation . Do I make the H as a D model with new wing shape or do I assume the model H designer took this into account? I'd guess not not but once plansre blown up I can check . Then what to do about it? I'm thinking I can make a sub wing mount that would allow for two different positions or I migh be able to make a more complicated adjustable mount. Our old aerobatic planes had this feature as guys were sorting out new planes . The wing could be moved just like the kids gliders . However even back then we were talking 100 mph models so trim errors could get out of hand in a hurry. I can see we are into some real serious thing here . I YHINK two wing saddles might bevthecway to go . These big warbirds usually follow the 1/3 cord rule give or take an inch. But this may be more than that . I'm not going to build an in-flight thing but more try it and see. Maybe a foam full size model glider . I guess I'll just have to hold on until I get the model plans laid out and see just where this puts things . I can't thank you enough for this! It may have saved a very bad crash. Already had that , don't need another.Beware of one VERY significant change made as result of extending fuse 13". The 1/4 chord line moved from approx 133" inches from tip of nose to 139 1/4".It had the effect of seemingly moving the entire cockpit forward of 'normal'. This was necessary to maintain similar stability derivatives while adding the 50gal fuse tank. There were no aft cg issues with the H.
The H wing position at 25%MAC was dictated to prevent aft cg condition due to 50gal fuse tank,Extremely important information! Thank you I did not know this . It creates a n interesting situation . Do I make the H as a D model with new wing shape or do I assume the model H designer took this into account? I'd guess not not but once plansre blown up I can check . Then what to do about it? I'm thinking I can make a sub wing mount that would allow for two different positions or I migh be able to make a more complicated adjustable mount. Our old aerobatic planes had this feature as guys were sorting out new planes . The wing could be moved just like the kids gliders . However even back then we were talking 100 mph models so trim errors could get out of hand in a hurry. I can see we are into some real serious thing here . I YHINK two wing saddles might bevthecway to go . These big warbirds usually follow the 1/3 cord rule give or take an inch. But this may be more than that . I'm not going to build an in-flight thing but more try it and see. Maybe a foam full size model glider . I guess I'll just have to hold on until I get the model plans laid out and see just where this puts things . I can't thank you enough for this! It may have saved a very bad crash. Already had that , don't need another.
I'll also check the stab too. The D model plans I have are well proven Rc planes I realize the full size had the big fuel tank . The only thing we have in the tail section is the tail wheel mechanics , these are pretty light as they mechanically operated by or servo operated by serv mounted just under the pilot seat if my H plans when enlarged come out close to the D size hot stab I'll be inclined to leave it as the B and D series plan planes are noted good flyers I might possible be able to come up with some additional blue prints . The plan D models were most often powered by heave gas engines so noe weight was not a problem . Keeping the tail light was an issue . The elev and rudder control horns were 2/4" wire so very heavy for model . They could be made from aluminum but the sharp bends make using higher alloy kinda tough torsionally they don't need steel material . I did some testing when I built the crashed model. I don't remember why I stuc with the steel wire . Most likely because there was to be a heavy gas motor . When we got rid of all the excess up front and gas motor we lightened the nose considerably even with the dual lipo batteries it was balanced right on the plan target value . I guess I'll have wait and see how construction goes . The model D designer does vey good Rc models the firt 120" B 125 flew perfect the first few fights with no additional ballast weight 50 pound plane .The H wing position at 25%MAC was dictated to prevent aft cg condition due to 50gal fuse tank,
The empennage dimensions and area - specifically the H.Stab were also larger for the P-51H over NA-73 through NA-122. The vertical dimension from bottom of cooling system cowl to top of canopy is greater. The Wing MAC chord dimension is slightly greater
There really is nothing in common between the H and the D airframe.
Hi, the tail was changed for the production like M mjfur did show in pictures. That is why some manuals/sources list different tail sizes.We are just starting anew Rc giant scale 1/5 P 51-H. I have secured plans and permission to enlarge and copy them one issue is " how much taller is the H model rudder. " all I can find is " significantly large " no numbers we think the plans are incorrect wingspan and length seem ok . Belly scoop needs some modification too but we have good views views of it
There are almost no Rc model plans available other than what I have also no plastic model kits other than the one from china that wanted my life information. Scale Rc competition is usual done but supplying documentation for scale features overall appearance craftsman ship then scale flight maneuvers including taxing take off and landing. I've had to demo various features like bomb drop or tank release ,sliding canopy, all control surfaces. Landing gear. Corsairs with folding wings have a huge advantage as do bearcats with scale retracts. Speed is judged as if it looks good it is good . Modern air shows limit full size air speed but wartime was as fast as needed so you have latitude there . Speed is very controversial. Engine sound and props ripping air seem to help. I made a perfect 10 l carrier landing out of a dark rain squall for a big win at one meet years ago. One of the boys ran out and simulated unhooking the cable then directed me to the mid ship elevator which was the middle runway exit . That was quite an ad lib by the boys. Watch too many videos LolThe H wing position at 25%MAC was dictated to prevent aft cg condition due to 50gal fuse tank,
The empennage dimensions and area - specifically the H.Stab were also larger for the P-51H over NA-73 through NA-122. The vertical dimension from bottom of cooling system cowl to top of canopy is greater. The Wing MAC chord dimension is slightly greater
There really is nothing in common between the H and the D airframe.
I assume you mean the Modelsvit 1/48 kit: you shouldn't need to go through too many hoops to get one. It's also been very well reviewed.There are almost no Rc model plans available other than what I have also no plastic model kits other than the one from china that wanted my life information.
Oh my gosh thank you ! I missed this drawing initially. This will really help once I get the the plans enlarged . I'll redraw the entire rudder to fit the actual scale size . I'm pretty sure that by the time the H model flew the tail surfaces were covered with the new " dural" aluminum . Not sure what this by today's standard but probably 2024t6 the few notes I've seen mention it is not easily welded but flush riveted. I YHINK it might be able to be resistance welded Iultra sonic had not been invented back then. I use thin carbon fiber pultrusions between wing skins now so trailing edges are almost knife sharp yet can stand a few bumps in the shop . With all this I'm getting really excited. I hate to ask for more room in the family home as I'm just gramps taking up space as it is . I just need a bit more building space .Hi, the tail was changed for the production like M mjfur did show in pictures. That is why some manuals/sources list different tail sizes.
You can check the NACA document explaining the changes: https://ntrs.nasa.gov/api/citations/20050028482/downloads/20050028482.pdf
And it also has some nice measures/drawings that you might like:
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Mmh maybe in the Structural repair Instructions you find what you are searching for, page 80: Avialogs: Aviation Library - AN 01-60JF-3 Structural repair Instructions for P-51H AirplaneOh my gosh thank you ! I missed this drawing initially. This will really help once I get the the plans enlarged . I'll redraw the entire rudder to fit the actual scale size . I'm pretty sure that by the time the H model flew the tail surfaces were covered with the new " dural" aluminum . Not sure what this by today's standard but probably 2024t6 the few notes I've seen mention it is not easily welded but flush riveted. I YHINK it might be able to be resistance welded Iultra sonic had not been invented back then. I use thin carbon fiber pultrusions between wing skins now so trailing edges are almost knife sharp yet can stand a few bumps in the shop . With all this I'm getting really excited. I hate to ask for more room in the family home as I'm just gramps taking up space as it is . I just need a bit more building space .
Anyway I really appreciate all the interest in this project.
Weird, seems like their server is down. ThanksThat link on the NTRS paper on the P-51H does not seem to work. This one does:
NASA Technical Reports Server (NTRS) 20050028482: Measurements of the Lateral and Directional Stability and Control Characteristics of a P-51H Airplane (AAF No. 44-64164) : NASA Technical Reports Server (NTRS) : Free Download, Borrow, and Streaming :
Flight tests of a P-51H airplane with two different vertical-tail assemblies were made to determine lateral and directional stability and control...archive.org
Thanks awaiting print enlargementsThat link on the NTRS paper on the P-51H does not seem to work. This one does:
NASA Technical Reports Server (NTRS) 20050028482: Measurements of the Lateral and Directional Stability and Control Characteristics of a P-51H Airplane (AAF No. 44-64164) : NASA Technical Reports Server (NTRS) : Free Download, Borrow, and Streaming :
Flight tests of a P-51H airplane with two different vertical-tail assemblies were made to determine lateral and directional stability and control...archive.org