RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

Thorpe F-20 build

Reply
Old 01-02-2012, 04:55 PM
  #151
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Starting to look like an airplane...
Attached Thumbnails
Click image for larger version

Name:	Ol31706.jpg
Views:	98
Size:	125.8 KB
ID:	1708801   Click image for larger version

Name:	Ez83076.jpg
Views:	87
Size:	64.0 KB
ID:	1708802  
tlj125 is offline  
Reply With Quote
Old 01-02-2012, 08:58 PM
  #152
Love To build
 
Love To build's Avatar
 
Join Date: Feb 2002
Location: Edison, NJ
Posts: 326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Very nice work Terry. 4 pounds? Nice.
Love To build is offline  
Reply With Quote
Old 01-04-2012, 05:57 PM
  #153
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Check the weight of the airplane as the difference of my weight and me holding the airplane on a bathroom scale. Of course the airplane is not finished yet. Just wanted any feedback from others who have built the plane. Does this sound about right? To me it seems rather heavy. I think a glass fuse and foam wings would be lighter.

Rough shaped and glued the base for the vertical fin. Made from 3/8" balsa sheet and used 30 minute epoxy. Drilled the control tube with a 1/8" drill bit 12" long by hand.
Attached Thumbnails
Click image for larger version

Name:	Yv65921.jpg
Views:	61
Size:	90.5 KB
ID:	1709893   Click image for larger version

Name:	Mh20173.jpg
Views:	49
Size:	78.9 KB
ID:	1709894   Click image for larger version

Name:	Lq37285.jpg
Views:	56
Size:	72.9 KB
ID:	1709895   Click image for larger version

Name:	Rl26405.jpg
Views:	56
Size:	83.8 KB
ID:	1709896  
tlj125 is offline  
Reply With Quote
Old 01-04-2012, 06:10 PM
  #154
Love To build
 
Love To build's Avatar
 
Join Date: Feb 2002
Location: Edison, NJ
Posts: 326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

From what I read on different boards The all up weight is between 7 - 10 pounds depending on power type and options.
Love To build is offline  
Reply With Quote
Old 01-04-2012, 07:52 PM
  #155
agent adds
 
Join Date: Oct 2007
Location: london, UNITED KINGDOM
Posts: 752
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

looking super-nice to see this thread at the top
agent adds is offline  
Reply With Quote
Old 01-04-2012, 09:23 PM
  #156
Love To build
 
Love To build's Avatar
 
Join Date: Feb 2002
Location: Edison, NJ
Posts: 326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Terry, Did you happen to keep track of a wood list? I got the plans scanned into a PDF file, and I'm now tracing the parts in Autocad for lazer cutting or CNC a router table. I will be shooting for EDF with Electric retracts. I can modify the parts in CAD to accept the new system parts.


Bill
Love To build is offline  
Reply With Quote
Old 01-05-2012, 02:34 AM
  #157
Bob_B
 
Bob_B's Avatar
 
Join Date: Nov 2003
Location: Bluegrass State of Mind
Posts: 3,495
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

FYI:
http://store.laser-design-services.c...products_id=49
Bob_B is online now  
Reply With Quote
Old 01-05-2012, 02:12 PM
  #158
agent adds
 
Join Date: Oct 2007
Location: london, UNITED KINGDOM
Posts: 752
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

have you thought about using a terry nitsch colour scheme?

maybe the famous one from his bvm ultra viper
agent adds is offline  
Reply With Quote
Old 01-05-2012, 03:58 PM
  #159
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Agent adds- Not familiar with Terry's color scheme. Is it green and white? I recall many years ago he had a green and white Vipe that was ducted fan with smaller wings to get more speed. That was back in the Heart of Ohio Days at the airport. Do you happen to have a picture of the color scheme you could post?

Bill- I did put together a list of wood sometime back. I'll see if I can dig it up and post it here.

Bob- I bought a second set of plans from LDS as my old plans were cut up. The lines on the drawings from LDS were thicker but otherwise identical.
tlj125 is offline  
Reply With Quote
Old 01-05-2012, 07:38 PM
  #160
agent adds
 
Join Date: Oct 2007
Location: london, UNITED KINGDOM
Posts: 752
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

hows this
Attached Thumbnails
Click image for larger version

Name:	Xv63559.jpg
Views:	46
Size:	84.5 KB
ID:	1710241   Click image for larger version

Name:	Zx72240.jpg
Views:	41
Size:	84.5 KB
ID:	1710242  
agent adds is offline  
Reply With Quote
Old 01-06-2012, 03:03 AM
  #161
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

That was it. I'm not fond of it myself. I never saw it fly. I heard it was fast. Terry was so busy taking care of others at the jet fly that I don't think he had any time left. Terry helped me maiden my first turbine, a bandit. A nice airplane but very expensive at the time. Those early versions had a problem with the vertical fin and mine suffered a failure in flight. Not the first flight, but later. Was nice while it lasted though. That was my last BVM model. Still sore over it and BV comments to me all these years later.
tlj125 is offline  
Reply With Quote
Old 01-06-2012, 06:36 PM
  #162
agent adds
 
Join Date: Oct 2007
Location: london, UNITED KINGDOM
Posts: 752
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

how about these
Attached Thumbnails
Click image for larger version

Name:	Xv63541.jpg
Views:	42
Size:	70.4 KB
ID:	1710569   Click image for larger version

Name:	Id95815.jpg
Views:	34
Size:	66.5 KB
ID:	1710570   Click image for larger version

Name:	Sx62125.jpg
Views:	24
Size:	81.9 KB
ID:	1710571   Click image for larger version

Name:	Tm30145.jpg
Views:	25
Size:	37.5 KB
ID:	1710572  
agent adds is offline  
Reply With Quote
Old 01-07-2012, 06:13 AM
  #163
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

All of those are very nice. Out of those, I liked the one on the right the best and the left the least. I was considering mostly black based on this picture shown below. Maybe add in some red or yellow to accent the wings and tail. Haven't decided yet though.
Attached Thumbnails
Click image for larger version

Name:	Jh15986.jpg
Views:	27
Size:	51.4 KB
ID:	1710766  
tlj125 is offline  
Reply With Quote
Old 01-09-2012, 05:58 AM
  #164
Airplanes400
 
Airplanes400's Avatar
 
Join Date: Jun 2008
Location: Florida
Posts: 1,631
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

If that yellow Aggressor III ever shows up in the classifides, I'm going to buy it.

As far as the color scheme you are contemplating, all I can tell you is that my F-20 that I had years ago (picture below) was a dark battleship gray. In the air, it was hard to see most of the time. Not a good thing when it's going 120 mph. I mostly depended on my instincts based on my control inputs, rather than the sillouette I kept seeing which caused illusions as to its direction and attitude in the sky. If you decide to use a basic black scheme, I suggest that you use yellow rather than red. At a distance, red will blend with the black. You always need a contrasting color.

I'm also glad to read that your jet is only 4 pounds so far. With all the epoxy you were using, I expected it to be heavier. You must be using it sparingly. When I build with balsa, I use CA as much as possible. I hardly use epoxy, except for fuel-proofing or behind engine bulkheads. A good alternative to epoxy is Elmer's Carpenter's Wood Glue ... Very strong and light weight.
Attached Thumbnails
Click image for larger version

Name:	Db86216.jpg
Views:	25
Size:	69.0 KB
ID:	1711875  
Airplanes400 is offline  
Reply With Quote
Old 01-09-2012, 07:17 PM
  #165
picard1
 
Join Date: Nov 2003
Location: MT SHASTA, CA
Posts: 368
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Ive been enjoying the build and am considering purchasing a kit. I was wandering if I could get a measurment where the turbine mounts to determine what size EDF fan would fit?
picard1 is offline  
Reply With Quote
Old 01-10-2012, 07:07 PM
  #166
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Lovetobuild- here is the list of wood that I used when I started. I did not check it for perfect accuracy so you might find some errors. But it is close.

9 ea 3/8” x 4” x 36” hard balsa sheet
1 ea 1/8” thick x 12” x 36” aircraft plywood
4 ea ¼” x 4” x 36” hard balsa sheet
4 ea ½” x ½” x 36” balsa triangle
1 ea ½” x ¼” x 36” balsa
2 ea 3/16” x 4” x 36” hard balsa sheet
24 ea 1/8” x 3/8” x 36” spruce
2 ea 1/8” x ¼” x 36” spruce
2 ea ½” x 3/8” x 9” maple (hardwood engine rails)
2 ea 1/32” x 12” x 36” plywood (ducting)
2 ea ¼” x 4” x 36” hard balsa sheet
12 ea 3/16” x 3/16” x 36” balsa square (stringers)
1 ea 3/16” x 3/16 x 36” spruce square (stringers in high stress areas)
1 ea 1/16” x ¼” x 36” spruce (LE for horizontal and vertical stab)
1 ea ¾” x 4” x 36” balsa sheet (fuse nose)
18 ea 1/16” x 4” x 36” hard balsa sheet (sheeting for wings and fuse)
tlj125 is offline  
Reply With Quote
Old 01-10-2012, 07:10 PM
  #167
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Picard1- the Thorpe F-20 is for a 5" (127mm) size fan. Measurement between the rails on mine is 5.125" inside the rail and 6.25" outside the rail.
tlj125 is offline  
Reply With Quote
Old 01-10-2012, 07:24 PM
  #168
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Airplanes400- I have flown grey and black colored planes and the black is easier to see to me. Even on a dark overcast day. On a clear day, it is easier to see than a white plane. Red and black contrasts very well for my eyes. Particularly with red on the top of the wings. You would think otherwise, but it works. At least for a bright red color. Never tried a dark red. For some reason I always use more CA than epoxy when I glue the same parts together. I just don't trust the CA. I've had too many joints fail that were glued with CA. By the way, the plaster mold I made for the canopy has dried out and hardened. So far, no cracks. Will be molding some canopies soon.
tlj125 is offline  
Reply With Quote
Old 01-10-2012, 08:50 PM
  #169
picard1
 
Join Date: Nov 2003
Location: MT SHASTA, CA
Posts: 368
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

tlj125

Thanks for the info on the fan size.
picard1 is offline  
Reply With Quote
Old 01-12-2012, 06:55 PM
  #170
Love To build
 
Love To build's Avatar
 
Join Date: Feb 2002
Location: Edison, NJ
Posts: 326
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Thanks Terry. Now to place an order.
Love To build is offline  
Reply With Quote
Old 01-15-2012, 02:32 PM
  #171
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Put the Wren 44 on a stand and ran it a few times to get familiar with it. I like the kero start feature. Very smooth start process and takes a little less time than my propane start Wren 75. Idles at about 55K rpm. From idle to full throttle takes about 5 seconds. From half to full takes about 1.5 seconds! Full throttle is about 195K rpm. Very surpised how little fuel was burned during my tests. I did not have any way to measure thrust. This is a cool little engine!

Terry
Attached Thumbnails
Click image for larger version

Name:	Wt59032.jpg
Views:	32
Size:	138.4 KB
ID:	1714459   Click image for larger version

Name:	Fa85406.jpg
Views:	28
Size:	112.5 KB
ID:	1714460  
tlj125 is offline  
Reply With Quote
Old 01-20-2012, 01:20 PM
  #172
tlj125
Thread Starter
 
Join Date: Mar 2005
Location: Jacksonville, FL
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Here are a few links to older videos showing various Thorpe Brothers airplanes flying including the F-20. These came from Ron Sweeney and his son Andrew.

http://www.youtube.com/watch?v=jjbfw...ature=youtu.be

http://www.youtube.com/watch?v=TpHs1...ature=youtu.be

http://www.youtube.com/watch?v=XF1NY...ature=youtu.be

Many thanks to Ron and Andrew for the videos. I remember the ducted fan days well. This is a walk down memory lane.

Terry
tlj125 is offline  
Reply With Quote
Old 01-20-2012, 02:07 PM
  #173
agent adds
 
Join Date: Oct 2007
Location: london, UNITED KINGDOM
Posts: 752
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

great viewing-proper modellers
agent adds is offline  
Reply With Quote
Old 01-21-2012, 03:50 AM
  #174
thunderchief
 
Join Date: Aug 2002
Location: Cincinnati, OH
Posts: 152
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Great videos!!!
thunderchief is offline  
Reply With Quote
Old 01-25-2012, 03:00 PM
  #175
fire.42
 
Join Date: Feb 2006
Location: liverpool, UNITED KINGDOM
Posts: 12
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Thorpe F-20 build

Hi Guys
Ron pointed me to this thread as I built one of these way back...must have been nearly 25 years ago now. Definitely a trip down memory lane! Nice to see all the problems shared by others too! Yes..very sticky snakes, PITA planking, snapping stringers...great design though! I spoke to Pete Thorpe last night, doesnt' fly so much now but still has all the bits for the kits, such as canopies and what-not for sale should anyone need them. Their website is currently down and sadly Pete doesnt use the internet much if at all. I'll get into him a bit over the near future and try to get him online.

regards

Dave
fire.42 is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 09:10 AM.