Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

speed freak qualifier?

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Old 01-08-2008, 10:14 PM
  #1  
dhal22
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Default speed freak qualifier?

Would the builder or pilot of this plane qualify for speed freak membership?

david
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Old 01-08-2008, 10:30 PM
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Mike Connor
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Default RE: speed freak qualifier?


ORIGINAL: dhal22

Would the builder or pilot of this plane qualify for speed freak membership?

david
I would think so.
You could probably close up the front of that cowl a bit for more speed and still have some good cooling. Exit should be 1.4 times the size of the entrance.
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Old 01-08-2008, 10:42 PM
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dhal22
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i've tried to get the builder of this plane to post photos for discussion before. the plane is actually in tulsa.
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Old 01-08-2008, 10:53 PM
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Mike Connor
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ORIGINAL: dhal22

i've tried to get the builder of this plane to post photos for discussion before. the plane is actually in tulsa.
I have not seen the plane yet. Who owns it?
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Old 01-09-2008, 06:42 AM
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Default RE: speed freak qualifier?

it is a scratch build, designed and built in the mid 80's by ron halcomb. it is an os engine i think a .61 VR and it was test flown by bill cunningham of the tulsa glue dobbers. i will get more details, though.

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Old 01-09-2008, 07:32 AM
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Looks great, although that landing gear setup seems to screaming for mercy
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Old 01-09-2008, 08:31 AM
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Cool, It has flaps. Flaps down and reflex the ailerons up a bit for landing, that will slow it down a bit, yet maintain lift and stability.
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Old 01-09-2008, 11:10 AM
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ORIGINAL: dhal22

it is a scratch build, designed and built in the mid 80's by ron halcomb. it is an os engine i think a .61 VR and it was test flown by bill cunningham of the tulsa glue dobbers. i will get more details, though.

david
I was a member of the Glue Dobbers in the 80's when Bill Cunningham was serious about pattern. He flew with a single stick transmitter that looked really weird.
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Old 01-09-2008, 01:04 PM
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nice...... [8D][&:]

but yeah, I would close up the bug-catcher .... and the landing gear... gear is ok.... but long round wire is a ton of drag.. eeek !
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Old 01-09-2008, 08:48 PM
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i will ask what the plane was clocked/timed at. and yes, retracts would be nice.

david
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Old 01-09-2008, 11:07 PM
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Hi guys,
My name is Ron Halcomb and I was the designer of this blue plane. I designed and built it back in the 80's. At that time I had no notion of speed forums and no experience in speed design. I figured that if I designed the plane with the narrowest frontal area it would cut down on the drag. Hence the 10% airfoil. Using equations for lift I soon found out that with the lift coeff of this airfoil it was minimal and I needed flaps to increse the lift coeff. to slow it down for landing. I had no knowledge of frontal engine cooling area let alone exit area. As for the spindally fixed landing gear and .25 thk wheels, that was all I knew to do. I did manage to use internal concentric tubing to operate the flaps and ailerons with no outside airstream disturbence. Likewise the rudder control horn was aerodynamically covered up. The elevator control horn exited the tail end of the fuselage out of the airstream.
As for the airspeed it was clocked by radar at 172 mph. However, that was coming out of dive. So I do not know what a level speed would have been. The plane weighed in at about 7.5 lbs. The engine was an OS .61 ABC pump with a rear exhaust and tuned pipe.
I asked Bill Cunningham to test fly it because I was just a novice at flying. I liked to design and build and not so much in flying. At that time I belonged to the "Turf Flyers" of Tulsa and it was flown at the end of Garnet st next to the arkansas river. I now live a long ways from the "Turf Flyer's" new field. I have my own flying field with lots of trees to eat planes.
I enjoyed the comments from you guys and if you have any questions or more comments I would be happy to answer them and I have taken note of your help. By the way Dave Halcomb is my nephew
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Old 01-09-2008, 11:12 PM
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Welcome Ron, and very nice plane!!!
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Old 01-09-2008, 11:28 PM
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Thank you skull1971.
Like I said I enjoy designing and buildiing from scratch. My background was in aeronautical engineering. I worked for Boeing and North American Rockwell from 1961 to 2004. I was a design engineer and have loved airplanes since I was 9 years old and am 68 years old as we speak. Thanks for your input. This was my first input to any forum.
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Old 01-09-2008, 11:52 PM
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ORIGINAL: rghalcomb

Hi guys,
My name is Ron Halcomb....I enjoyed the comments from you guys and if you have any questions or more comments I would be happy to answer them and I have taken note of your help. By the way Dave Halcomb is my nephew
Welcome Ron, These forums can be fun or drive you crazy. Input from an aeronautical engineer is always welcome. I am not too far from you in Tulsa and fly with the Tulsa Glue Dobbers.
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Old 01-10-2008, 05:21 AM
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Default RE: speed freak qualifier?

i finally got him onboard. he will be a regular like me anyday now. except i hang out in the classic pattern forum.

David
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Old 01-10-2008, 12:07 PM
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Hello Mike,
If you would like give me a call. My phone no. is 363-7087. I would like to talk to you. I live south of the Keystone lake on 61st south (out in the boondocks). I have a field that is approx. 1000 ft by 500ft at one end and about 200ft at the other end. It is a north/south runway. It's part of an 80 acre tract. There are lots of trees (broken ones from the ice storm) and they love airplanes for lunch.
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Old 01-10-2008, 12:28 PM
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ORIGINAL: rghalcomb

Hello Mike,
If you would like give me a call. My phone no. is 363-7087. I would like to talk to you.... There are lots of trees (broken ones from the ice storm) and they love airplanes for lunch.
Oh yes, the ice storm. I did a little better then my neighbors accross the street. Talk to you later.
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Old 01-10-2008, 12:39 PM
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Hi Ron.....

That was a fun project!

Thanks for sharing some of the details with us............

and nice to see the plane is still attracting attension !
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Old 01-10-2008, 06:01 PM
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Hello Bob,
Thanks for the input. I am inspired to design another fast plane using an OS .91 VR-DF. I bought this engine new from Bill Cunningham when he still had his hobby shop (Ultimate RC--Tulsa OK) around 1992. It was a part of his F-16 ship that he was working on. So it's been sitting around in it's new box ever since. I will use retracts and take advantage of enclosing the engine per Mike Conner. I use AutoCad for my design work (2D). I haven't used the 3D Solid modeling for some time. Thanks again for you input.......Ron
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Old 01-11-2008, 07:17 AM
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Looking forward to seeing the new bird.
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Old 01-11-2008, 08:20 AM
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Classy looking airplane Ron, it somewhat reminds me of air racers from the golden era that used inline engines.

Using concentric tubes to operate the flaps and ailerons is not a trivial design detail, and I would be interested in more information on how you solved the problem. Also, what are the dimensions of the airplane?
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Old 01-12-2008, 03:44 PM
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Hello HighPlains.
Ok I measured the plane and here it is: WS=54"; Fuse=50"; Horizontal=18" and Rudder is 6"high. Now the concentric brass tubes are old school but they worked back when. With the new 2.4 tx I assume that you will not have any interference problems. When Bill Cuningham flew it (around 1992 I think) there were no interference problems. I built another scratch build using the same technique and flew it and had no apparent problems. However I now have interference such that all the controlled surfaces begin to flutter. So I either buy me a 2.4 tx or use an optical isolator gismo to remove the problem. I still like the idea of not having control horns and parts of the servos out in the airstream. But if you have any suggestions I would like to hear from you.
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