RE: Sig Deweybird Flight tips.
The airplane should balance on on near, no more than 10% MAC back, the leading edge.
Posted on: 9/12/2012 1:32 PM by Author "Jim Thomerson" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11226435

RE: Model Aviation and Dogs
Someone had a male German Shepard at a control line contest in Rockford Illinois, around 1980. I don't recall if the dog was leashed, but he had perfect behavior and was no problem. When we were flying Goodyear racing, one of the airplanes lost a wheel on landing for a pit, and ended up upside down about halfway to the center of the circle. When the race was over, the other two airplanes down, the dog raced out to the downed airplane, lifted his leg and doused it. He immediately ran back to his owner. Everyone, including the owner of the airplane, thought it was hilarious.
Posted on: 9/11/2012 9:26 AM by Author "Jim Thomerson" in the forum "AMA Discussions"
http://www.rcuniverse.com/forum/fb.asp?m=11225083

RE: Having engine, wing and horiz. stab on a common centerline as opposed to having it otherwise.
Most control line stunt airplanes have the stab and elevator above the wing center line. For one thing it is easier to get the pushrod and control horn on the elevator where you want them The thrust line and wing center line may be the same or not. I get the impression that the engine is often placed where the wing centerline goes through the CG of the engine, at least that is how I have designed CL stunt airplanes. There are very successful stunt airplanes: however, which have the thrustline, wing centerline, and stab-elevator in line.
Posted on: 9/7/2012 3:36 PM by Author "Jim Thomerson" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=11221098

Threat blocked?
I often get a Threat Blocked notice when I click on RC Universe. I don't get it anywhere else.
Posted on: 9/4/2012 9:03 AM by Author "Jim Thomerson" in the forum "The Clubhouse"
http://www.rcuniverse.com/forum/fb.asp?m=11216962

RE: What prop size for .15 Sport UC plnes?
There is a review of the Cheetah, Lynx, and Jaguar in the reviews posted by Downunder. They seem to run in the 7,000 more or less RPM range. i was flying my Cheetah on a Ron Prentice Big Fry, and tried various props. I am building another airplane for it, one more streamlined than the Big Fry. It is a favorite engine, one flip starts, and runs without change through maneuvers.
Posted on: 9/4/2012 9:00 AM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11216956

RE: What prop size for .15 Sport UC plnes?
I have found an 8 x 4 to suit me best on ST G20-15 diesels flown on Old Time Stunt airplanes. A 9 x 4 works OK, but I think the engine is happier with an 8 x 4. I am presently running a Taipan 9 x 4 on an AM 25 and happy with it. I have run 9 x 5 on CS Oliver and the # 13 Taipan. Ed Racer ran best on 8 x 6. I ended up running a 9 x 8 on one of Ian Russel's Cheetah engines. I plan to try an 8 x 8.
Posted on: 9/3/2012 8:01 AM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11215614

RE: Sig butyrate dope- does it exist?
I got my dope from Wicks Aircraft Supplies in Highland IL.
Posted on: 9/2/2012 5:33 AM by Author "Jim Thomerson" in the forum "Tips & Techniques"
http://www.rcuniverse.com/forum/fb.asp?m=11214259

RE: Starting ?
I flew a Cox 15 MK I (so to speak) on 10% nitro on a CL stunt airplane. It eventually blew a rod, but the glowhead was still fine.
Posted on: 8/24/2012 12:27 PM by Author "Jim Thomerson" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11204668

RE: Engine test reports
Excellent! I found a report on an engine I have which I had little idea how it should be run.
Posted on: 8/24/2012 12:23 PM by Author "Jim Thomerson" in the forum "Control Lines"
http://www.rcuniverse.com/forum/fb.asp?m=11204662

RE: Starting ?
Cox plugs are generally very sturdy. I expect to put hundreds of flights on one. I have, over the years, had one or two which burned out the second a battery was connected, so there is some variability. I use a 2 volt 5 amp-hr Cyclon lead acid gel cell. I have about a 5 foot lead on it and a clip that fits Cox plugs as well as others. A major problem with starting Cox engines in not having the glow plug hot enough. It should be at least orange, and I run them more toward yellow.
Posted on: 8/23/2012 7:29 PM by Author "Jim Thomerson" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11204034

RE: AMA to close the AMA Discussions Forum
I have consistantly criticized the AMA for its lack of interest in promoting model aviation to the general public, on the AMA forum and anywhere else I could find. I have never been deleated or banned. Why can't I be treated the same as everyone else?[:)]
Posted on: 8/23/2012 8:57 AM by Author "Jim Thomerson" in the forum "AMA Discussions"
http://www.rcuniverse.com/forum/fb.asp?m=11203413

RE: Fuel tanks and CG's
No, because the fuel can't move very far, so there a very short lever arm. Torque = length of lever arm x weight. As a guess with no calculation, I would think your CG might move a total of 1/16 in. ( That should encourage someone smarter than me to do the actual calculations.) Your vertical CG should move down more noticably as you run out of fuel.
Posted on: 8/18/2012 7:19 PM by Author "Jim Thomerson" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=11198265

RE: AMA to close the AMA Discussions Forum
I haven't visited in a couple of months, so OK by me.
Posted on: 8/18/2012 1:16 PM by Author "Jim Thomerson" in the forum "AMA Discussions"
http://www.rcuniverse.com/forum/fb.asp?m=11197987

RE: New 09 Diesel
Well yes, On the K&B 4011, I turned the needle in a turn and a half to get it tuned from glow to diesel. Drone diesels are wierd. I had to turn the needle in about a half turn from diesel running setting to tune the glow run. There is a point of view that our engines are air pumps, and the more air run through, the more power, regardless of fuel.
Posted on: 8/18/2012 8:17 AM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11197768

RE: New 09 Diesel
I got the same RPM figures running a K&B 4011 glow engine on diesel fuel and with glow fuel. I also got the same RPM on a Drone diesel with the Drone glowplug head. I think how much power an engine puts out is resident in the engine design more than in the fuel. I think, as a general statement, to say that diesels are more powerful than glow, is a myth.
Posted on: 8/18/2012 7:06 AM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11197710

RE: Simple Trainer for a .15?
Seamus, If you choose the right buddy, it is not so bad. [:D]
Posted on: 8/12/2012 1:29 PM by Author "Jim Thomerson" in the forum "Control Lines"
http://www.rcuniverse.com/forum/fb.asp?m=11190612

RE: Piston Ring Question
I think that pin is supposed to go in the groove to keep the ring from rotating.
Posted on: 8/12/2012 1:26 PM by Author "Jim Thomerson" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11190610

RE: Simple Trainer for a .15?
The ideal way to learn to fly control line is to have a slow stable airplane to fly, and have an experienced flyer out in the circle with you. The experienced flier holds your hand for the take off and first couple of laps, until you get the feel of it. Then lets you take over until you start to get dizzy. The experienced flier takes back the handle, and lands the airplane while you lie on your back with the world spinning around. Subsequent flights you will become more skilled and less dizzy. Soon you will be able to take off, fly the tank out and land by yourself without getting dizzy.
Posted on: 8/11/2012 2:22 PM by Author "Jim Thomerson" in the forum "Control Lines"
http://www.rcuniverse.com/forum/fb.asp?m=11189606

RE: Simple Trainer for a .15?
Not that I know of. It is simple enough you could draw your own plans. Generally, on an airplane like this, you just start measuring and cutting, no need for plans. [;)]
Posted on: 8/9/2012 1:22 PM by Author "Jim Thomerson" in the forum "Control Lines"
http://www.rcuniverse.com/forum/fb.asp?m=11187256

RE: Simple Trainer for a .15?
Here is one of my Guillows #2 trainers. It has hundreds of flights on it. Engine is a worn out McCoy 19 with 9 x 4 prop. In a fourstroke it gives 7 sec laps on 65 ft 015 lines. Not uniflow, so the last few laps are down to 6 sec; about 28 laps total. Dimensions are; span 30 in, Chord 7 in to 5 1/2 at tip, fixed flap, wing 3/8 thick. 5 in from LE of wing to glowplug, 15.5 from LE of wing to elevator hinge line, stab span 13 in, stab 2 1/2in center with 2 in tips. Elevator 1 5/8 in center with 1 3/8 tips. CG 3/4 in back of wing LE. Fuselage 3/4 balsa, engine mount 3/4 in hardwood.
Posted on: 8/9/2012 9:38 AM by Author "Jim Thomerson" in the forum "Control Lines"
http://www.rcuniverse.com/forum/fb.asp?m=11187002

RE: glow plug thread
I emailed the author. He admitted to, and apologized for, being confused. 1/4 x 32 it is. Even so, I thought this was a better than usual issue.
Posted on: 7/29/2012 8:01 AM by Author "Jim Thomerson" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11173223

RE: AMA PLANS SERVICE SEE'N RED
Thanks to AMA plans service. Looks like it is going to fly fine.
Posted on: 7/27/2012 8:56 AM by Author "Jim Thomerson" in the forum "AMA Discussions"
http://www.rcuniverse.com/forum/fb.asp?m=11171259

RE: please dont hate me, i know this question have been asked before,but i need specific answer.
Shaler Rislone oil treatment works fine.
Posted on: 7/26/2012 7:38 PM by Author "Jim Thomerson" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11170720

RE: CL 1949 Puddle Jumper with AH Drone diesel
The tubing is gasoline tubing from the lawnmower place. The lines are .008 stranded. Back in the early 80's we flew 1/2A Goodyear on .008 solids and had a lot of trouble with lines sticking.
Posted on: 7/24/2012 8:38 AM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11167256

RE: CL 1949 Puddle Jumper with AH Drone diesel
It handles well enough to be on an airplane. It has less than an hour running time and I am still learning how to reliably start it. I'm running on Eric Clutton Old English fuel, so it is not any special high ether small diesel mix. The tank is a uniflo, and the engine runs very steady flying around level with ups and downs. The tank as shown is good for about 15 minutes (estimated), so I'm going to start measuring fuel, as plumbing am even smaller tank is not an easy task for me. It does vibrate, so I think it probably has an unbalanced crank like the original Drones.
Posted on: 7/22/2012 6:01 PM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11165018

RE: Berkley 1949 Puddle Jumper, CL. AH minature Drone diesel
I got the plans from the AMA Plans Service. If you can't get one there, I can copy mine for you. I learned to fly CL on the Sen~or Puddle Jumper with a Cameron 19. (don't know how to get the ~ over the n.) I have Senor Puddle Jumper plans and think about maybe building another.
Posted on: 7/22/2012 5:52 PM by Author "Jim Thomerson" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11165007

CL 1949 Puddle Jumper with AH Drone diesel
Flew this today, and it needs longer lines, say 30 ft. The Puddle Jumper is a 1949 Berkley design. I got plans from the AMA Plans Service. It is covered with silk, nitrate dope, black tissue numbers and letters, blue canopy, and black front end are Sig butyrate. Prop is 5.5 x 4.5 and the tank is way too big. I plan to enter it in Old Time Stunt at the Vintage Stunt Contest at Tucson in March. A Drone 29 is shown for comparison with the Arne hende .5cc Drone.
Posted on: 7/22/2012 2:25 PM by Author "Jim Thomerson" in the forum "Everything Diesel"
http://www.rcuniverse.com/forum/fb.asp?m=11164731

Berkley 1949 Puddle Jumper, CL. AH minature Drone diesel
This got flown today and is going to be OK. It is covered with silk, and has black tissue letters. The blue canopy is Sig dope. A Drone 29 is shown for comparison. The Arne Hende Drone is .5cc, .033 ci. Prop is 5.5 x 4.5. Flew it on 22 ft lines and will make a set of 30 ft lines for it. 3.5 oz weight.
Posted on: 7/22/2012 2:17 PM by Author "Jim Thomerson" in the forum ""1/2 A" & "1/8 A" airplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11164721

RE: OS 1/4-28 Prop nut
I found 1/4 x 28 nuts at the local hardware store. They may be labeled 1/4 fine vs 1/4 x 20 which is 1/4 coarse.
Posted on: 7/18/2012 12:45 PM by Author "Jim Thomerson" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11160152

RE: AMA PLANS SERVICE SEE'N RED
Over the past four of five years I have posted on various forums that I wanted a plan from an obscure Berkley kit from 1949. Recently, some one replied that the AMA had the plan. I ordered it, and as soon as I get the tank put together, the airplane will be ready to fly. [:D]
Posted on: 7/18/2012 12:41 PM by Author "Jim Thomerson" in the forum "AMA Discussions"
http://www.rcuniverse.com/forum/fb.asp?m=11160144