Airlinercafe Home Page

Stop being a lurker - join our community and get involved. Sign up and start a conversation!
 

      Author Message

      Tom Probert


      Members

       Online status  

       
      Add As Buddy
      Posts: 65
      Location: Kent
      Occupation: Teacher
      Age: 39

      Post #77952, posted on 04-08-2021 GMT-5 hours    
      &񗜻
      I've long wanted to convert Heller's classic 1:72nd DC-6 to a DC-7 so I recently took the plunge and ordered the Aircraft in Miniature conversion set from Hannants. A box soon arrived crammed full of nicely molded grey resin along with a comprehensive set of instructions.†

      †The conversion kit†gives you fuselage plugs to extend the DC-6 fuse to the longer DC-7, a new wing centre-section, a new taller and squarer fin, saddle tanks for the engines, new cowlings and cooling gills (open or†closed) as well as white-metal 4-bladed props. All in all a very comprehensive set.†

      by Thomas Probert, on Flickr

      Looking at the work ahead I have decided to tackle the wings and engines first as these look to be the most demanding parts of the conversion. My first job was to remove the DC-6 engine nacelle extensions that sit over the wing - the new saddle tanks will replace these in due course:

      Untitled by Thomas Probert, on Flickr

      Next I prepared the upper wings for mating to the new, extended wing centre-section by removing the inner section of the wing to fuselage fairing:

      Untitled by Thomas Probert, on Flickr

      I then added a false roof to the main gear bays as the surgery required to add the saddle tanks will undoubtedly be ugly, and then I offered the lower wings to the new wingbox. The original DC-6 centre-section gives a useful comparison:

      Untitled by Thomas Probert, on Flickr

      I've encountered a small issue in the fact the chord of the new resin wingbox is greater than that of the DC-6 wing, but a file should soon take care of that...

      Wing Insert by Thomas Probert, on Flickr

      More updates to follow as this project progresses - stay tuned!

      All the best,

      Tom

      &񗜻

      Author Message

      Gus


      Members

       Online status  

       
      Add As Buddy
      Posts: 51
      Location:
      Occupation: Retired KLM pilot
      Age: 68

      Post #77953, posted on 04-08-2021 GMT-5 hours    
      Hey Tom,
      Thanks for this !
      I started with the fuselage and vertical stabiliser. That's a lot of work, but it can be done.
      I also find out that the cord was not correct but that should be able to be corrected.
      The wing is still something I have to look at even with your info.
      Sorry but I still can't upload photo's here, that's really is annoying.
      Cheers
      Gus

      Author Message

      Tom Probert


      Members

       Online status  

       
      Add As Buddy
      Posts: 65
      Location: Kent
      Occupation: Teacher
      Age: 39

      Post #77954, posted on 04-08-2021 GMT-5 hours    
      Quote
      Gus :
      Hey Tom,
      Thanks for this !
      I started with the fuselage and vertical stabiliser. That's a lot of work, but it can be done.
      I also find out that the cord was not correct but that should be able to be corrected.
      The wing is still something I have to look at even with your info.
      Sorry but I still can't upload photo's here, that's really is annoying.
      Cheers
      Gus



      Thanks for stopping by, Gus.

      How did you find the fuselage plugs? Are they a good fit to the fuselage? A test fit doesn't give any major concerns, but I'd be interested to hear your thoughts.

      Thanks,
      Tom

      Author Message

      Gus


      Members

       Online status  

       
      Add As Buddy
      Posts: 51
      Location:
      Occupation: Retired KLM pilot
      Age: 68

      Post #77955, posted on 04-09-2021 GMT-5 hours    
      Hi Tom,

      The fuselage plugs are too big. The diameter of the part that fits into the fuselage halves is too big, so lot's of filing is needed which is a lot of work because the material is quite hard.
      Removing the vertical stabiliser is straight forward and the new one looks to fit well.

      Cheers
      Gus

      Author Message

      Tom Probert


      Members

       Online status  

       
      Add As Buddy
      Posts: 65
      Location: Kent
      Occupation: Teacher
      Age: 39

      Post #77963, posted on 04-10-2021 GMT-5 hours    
      Quote
      Gus :
      Hi Tom,

      The fuselage plugs are too big. The diameter of the part that fits into the fuselage halves is too big, so lot's of filing is needed which is a lot of work because the material is quite hard.
      Removing the vertical stabiliser is straight forward and the new one looks to fit well.

      Cheers
      Gus



      Thanks for the heads up, Gus - good to know and something I can look out for when I commence on the building of the fuselage.
      &񗜻
      The lower wing halves were added to the new resin centre section, after the leading edges were filed and reshaped to match the Heller DC-6 wing. As you can see there are some substantial tabs that insert into the the DC-6 wing and these, coupled with five-minute epoxy have resulted in a very solid join:

      Untitled by Thomas Probert, on Flickr

      With some initial sanding, the lower join isn't too bad at all:

      Untitled by Thomas Probert, on Flickr†

      The upper wings were braced with a sprue spar as they were weakened from the removal of the DC-6 nacelles, and then added to the lower sections. Here the join wasn't so great but I think this is solely down to the fact I didn't measure thrice and cut once - some plastic shims filled the gaps and then Milliput has done the rest. The wings are now in the process of having their panel lines restored:

      Untitled by Thomas Probert, on Flickr

      So far, so good...

      †Until next time,

      Tom

      &񗜻

      Author Message

      Tom Probert


      Members

       Online status  

       
      Add As Buddy
      Posts: 65
      Location: Kent
      Occupation: Teacher
      Age: 39

      Post #77989, posted on 04-15-2021 GMT-5 hours    
      Work has continued on the wings of late, and specifically the engines.

      The resin replacement saddle tanks needed a bit of hot water treatment to get them to conform to the shape of the wing a little better, before they were epoxied firmly in place. A quick lick of Milliput sorted the joints without any major issues:

      Untitled by Thomas Probert, on Flickr

      Untitled by Thomas Probert, on Flickr

      Next up was adding the rearmost sections on the engines themselves which include the exhaust stystem and various intakes. These sat slightly lower at the top if the large intake and therefore needed to be built up with some filler, but once sanded everything is nice and level and blended in:

      Untitled by Thomas Probert, on Flickr

      Untitled by Thomas Probert, on Flickr

      I think I've gone as far as I need to with the wing and engines now, so will likely turn my attention to the fuselage...

      Until next time,

      Tom

      Author Message

      LH707


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 1475
      Location:
      Occupation:
      Age:

      Post #77998, posted on 04-16-2021 GMT-5 hours    
      Looking good!

      Author Message

      Tom Probert


      Members

       Online status  

       
      Add As Buddy
      Posts: 65
      Location: Kent
      Occupation: Teacher
      Age: 39

      Post #79791, posted on 01-09-2022 GMT-5 hours    
      &񗜻
      Lots of progress to report on this build since the last update, but unfortunately I've since changed phones and lots of photos were lost when I transferred everything over. However, I had the decent camera out today so snapped some of the model in its current state.†

      The wings have been finished off and the fuselage extended with new windows added to replicate the longer DC-7. The fuselage plugs fitted well but the new resin insert wing centre-section took a bit of fettling to get it to mate with the Heller fuselage but I got there in the end. The engines are just attached for the photos and are yet to be finished and painted. The new tail has also been added and fared into the trimmed down DC-6 fin:

      DSC_0059 by Thomas Probert, on Flickr

      DSC_0057 by Thomas Probert, on Flickr

      DSC_0062 by Thomas Probert, on Flickr

      DSC_0054 by Thomas Probert, on Flickr

      DSC_0055 by Thomas Probert, on Flickr

      I need to finish the flightdeck and cockpit next and then I can give her a shot of primer to see how the new parts have blended in.

      Tom

      &񗜻

      Author Message

      NX28388


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 675
      Location:
      Occupation: Professional overthinker
      Age:

      Post #79797, posted on 01-10-2022 GMT-5 hours    
      This is very nice work and a lot of fun to watch come together. I am following with interest. (I also hope you make it to the finish line with the nose gear strut intact - one of the most delicate parts of that kit!)

      Continued luck and success. Keep us updated.

      Jodie Peeler

      "In any dispute the intensity of feeling is inversely proportional to the value of the issues at stake." - Sayre's Law

      Author Message

      Jennings


      Contributors

       Online status  

       
      Add As Buddy
      Posts: 4573
      Location: The great desert southwest, USA
      Occupation: Nurse Anesthesiologist
      Age: 119

      Post #79803, posted on 01-10-2022 GMT-5 hours    
      Nice job! Thatís a beast of a conversion. Too bad they didnít include the needed wheels.