Nov 22, 2006, 01:23 AM  

Discussion
My Next Project? How about a MIG 144
After finally settling down from the Las Vegas show, I began looking for my next project. I wanted something tht would really have a WOW factor that had not been done before. I was looking for something to bring to Vegas next year that would take Foamie ParkJets to the next level. I also wanted to get a real good head start so I was not burning the midnight oil like a mad man for 2 weeks before the event like I did this year.
I began searching the internat for project ideas. The plan was to make the largest parkjet that would fit inside my truck, and still be able to close the tailgate. I figured that having to pull a 7x14 foot trailer to bring a foamie jet to the field was pushing the envelope a little too much! After a quick trip out to the truck with my tape measure I came up with the following information. I split the back end of my truck into 2 levels for the trip this year by laying three 2x4's across the bed of the truck, resting them on the lip along the bottom edge of my fiberglass topper where it meets the top of the bed sides and calmping them down with Cclamps. Then I laid a couple 30" x 96" tables on top to form a platform. This area created above the tables measured 97 inches long by 62 inches wide by 28 inches tall. Most of the ParkJets that have been designed by Steve Shumate and others have been sized so they are approximately 42 inches long, with a 28 inch wingspan. Based on this, if I designed a plane that was around a 215220% enlargement of the basic sized plane, it would still fit in my truck in 1 piece. To allow a little breating room I decided that the plane would have a wingspan of no more than 60 inches and would be around 90 inches long. That should bring a little attention at the flying field! Now that I had settled on a size, the big question was what to build. For a plane this large, I knew that I wanted to go with a dual pusher prop setup. Two smaller engines are a lot easier to manage than one large one when it comes to ESC's and batteries. As a side benefit, if you lose one motor or ESC, you can limp home on the remaining motor and get the plane back for a landing. With that in mind I started looking for a subject to model. At first I thought about doing a big F15, but that plane has already been done many times, and I wanted something different. I ran through a bunch of 3views, but nothing seemed to really turn me on. I looked at a bunch of other American planes, but did not find anything I liked. So I figured that I would look over to the Russian aircraft to see what they had to offer. I thought about the MIG29, since it is a pretty good looking plane. and pulled up a 3view. This would be OK for a single motor setup, but the engines are set too far into the fuselage to do a dual motor setup without having the props hit the trailing edge of the stabilators. Next I looked at the SU47. It is a pretty cool looking plane, but it does not have a lot of wing area and I did not want the new creation to end up being a pig. I looked around for some more Russian aircraft and I came across the new MIG 144 that is still in development. Now this looked promising! At first I thought that the 2 engines were too close together, and buried between the tails, but then I noticed the 2 rear facing radar pods. If I fattened these up just a little bit, I could hang a pair of motors in those locations, and I could get spinners that would look like the radar domes! For a full page version of the above 3view click here. Here is another 3view that shows the shape of the plane a little better. This thing has Gobs of wing area, and the central fuselage is a basic box with rounded corners. I plotted a larger version of the 3view to take some measurements and do some scaling. If I scale the 3view to a 60" wingspan, I get the following numbers. For wing areas, I counted the area swept by the fuselage within the wing and canard outlines Wingspan .......................... 60" Overall Length .................... 90.5" Canard Span ...................... 30.5" Main Wing Area ................... 1410 Sq. In. (That's almost 10 square feet! ) Canard Wing Area ................ 330 Sq. In. Total Lifting Surface Area ..... 1740 Sq. In. (A little over 12 square feet) Based on my other foamie jets, I would project an airframe weight, with no gear installed, of around 5 pounds. My target power requirement will be 2000 watts spread out over two 1000 watt brushless motors. Since I have the 6cell A123 packs already made up for my other 150% and 166% ParkJets, and these can deliver 600 watts each with no problems, I will probably use 4 of them together in this plane. The plan is to use two batteries in parallel for each motor, as this would give me a pair of 21.6 volt 4600mah batteries. Under load, these batteries will deliver 17.3 volts at 58 amps to give 1003 watts of power output per motor. These batteries weigh 1 pound each, so the total battery weight would be 4 pounds. The radio gear will probably consist of 56 standard sized servos plus a receiver and BEC and that, with the pushrods and linkages, will all add another pound of weight. As much as I like hand launching the large ParkJets, I think that this one will be just a bit too big for that, so a set of retracts are in order. I would guess that a set of retracts big enough to hold a plane of this size would end up weighing around a pound as well. So that brings the total so far to 11 pounds. Let's see, what else, Oh Yeah, we can't forget motors! 1000 watt motors will tip the scales at around 1 pound each, so that will bring the weight up to 13 pounds. If I figure another 2 pounds for glue, paint, and other miscelaneous items, the total weight should come to 15 pounds give or take. 2000 watts of power would give 133 watts per pound, and with 12 square feet of lifting area, the wing loading would only be 20 ounces per square foot! If I want to boost the power a bit, I could step up to 8cell packs and get almost 2700 watts of power at the same current draw. This would get the power loading up to 166 watts per pound, and only add a little over a pound to the airplane. It looks like the project is very doable, looking at the total picture. It could turn out to be a very interesting build thread! I still have a lot of planning and calculating to do, as well as draw up a set of plans, but I have 111/2 months until next years Vegas Flyin! I may draw the plans up as a standard foamie size first to check the fit of everything, and then scale that one up 220% to get the size I want, we will see. Any thoughts or comments? I need to go sharpen some pencils! Lucien 

Nov 22, 2006, 07:54 AM  

This looks promising Lucien!
If you're going to build a Mig 1.44 you might want to look at the one designed by mesnick: http://www.parkjets.com/mig144.html http://www.rcgroups.com/forums/showt...t=464415&pp=15 Looking forward to the build! /Fredrik 
Nov 22, 2006, 08:12 AM  

You never cease to amaze me Lucien. I'll be watching. It ought to be great in Vegas although you'll probably have to get clearance from the tower at Nellis before takeoff!
J 
Latest blog entry: Mitsubishi A5M Claude at 1/8th scale


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