|Nov 22, 2006, 01:23 AM|
My Next Project? How about a MIG 1-44
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 C-clamps. 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 215-220% 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 set-up. 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 F-15, but that plane has already been done many times, and I wanted something different. I ran through a bunch of 3-views, 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 MIG-29, since it is a pretty good looking plane. and pulled up a 3-view.
This would be OK for a single motor set-up, but the engines are set too far into the fuselage to do a dual motor set-up without having the props hit the trailing edge of the stabilators.
Next I looked at the SU-47. 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 1-44 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 3-view click here.
Here is another 3-view 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 3-view to take some measurements and do some scaling. If I scale the 3-view 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 6-cell 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 5-6 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 8-cell 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 11-1/2 months until next years Vegas Fly-in!
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!
|Nov 22, 2006, 04:51 AM|
Whoa Lucien, this looks pretty sweet! Whew! A 15 pounder? Wow moan, that's pretty heavy! This should be really interesting to watch, by the way I am crazy about that plane! I really like the design of the Mig 1.44, it looks very cool! I like the fact that unlike most modern delta wing fighters, this one has two vert. stabilizers. Although I really, really like the looks of single vert. stablizer planes like the Eurofighter and the Rafale, there's something about the 1.44's twin vert. stablizers that looks very cool. What a powerful system! That sounds pretty neat, I will look forward to following this thread for sure. Go 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:
Looking forward to the build!
|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!
|Nov 22, 2006, 09:07 AM|
Yea nellis might think that it's "game on" ...your just the man for the job!i say go for it ...it would be diff. and a eye popper for sure. also your F-4 on retracts would be cool also.
|Nov 22, 2006, 10:09 AM|
This is going to be one big Bird If anyone can pull it off, you can!! Mesnick's plans have a new modified nose sect. using a layered build simular to how the Green Air Design's jets are built. I just loaded up a zip file for his new nose section yesterday. The plans would very easy to enlarge.
|Nov 22, 2006, 10:33 AM|
I had completely forgotten about that build thread. I did see it a while ago, thanks for the memory jog! I will scan through that build to look for inspiration. The finished model looked awesome!
That means a lot coming from a Master Builder like you. It should be a fun build!
This one is definately going to need retracts! Just a tad too big for hand launching.
I just looked at the plans on your website. This one will require a complete re-design of the one presented there. I will do an airfoiled wing like I did on my 166% F-18 with carbon fiber spars inside. I am going back and forth on whether or not to make the main wing panels plug-in or fixed. Removable wings will make transportation and storage easier, but it will add at least a half a pound to the structure and maybe more. Decisions, decisions!
I am going to try rendering the airframe in a 3-D CAD software package. I have a copy of the free version of Alibrie which would work, but we are thinking of getting a copy of Solid-Works for the office, and since I am the lead Mechanical designer here, I would be the one using it! This would be a good project to use to learn how to use the program. It would be great to be able to fit all the parts together in virtual space before cutting any foam!
I still have a lot of measuring and calculating to do before I start building, so it will probably be after the first of the year before any parts get glued together. It will keep me busy!
|Nov 22, 2006, 03:00 PM|
3 mi.south of mt Blanca,CO. 2 mi. out of the town of Blanca.
Joined Mar 2006
LB,Ilove the look of the mig!Asfor p-in wings,I may shine some light on the subject.First,Deltas don't really need a spar(extremely low aspect ratio),but I always include one just incase I have designed over a dozen Deltas in the past 4-5 yrs.and just happen to have one right now with a 55" span that has plug-in wing "outer panels"As I was building the plug-in system,I weighed all the components and the total wt for the mod was just under 3oz!There are 2 -5mm carbon rods (1 ea. in the outer panels and 1ea .125" music wire allignment pins at the TE)and small Neo magnets to secure the panels.The Elevons are joined by .125" MW at about 75% chord.Anyway If you wand the fuse to be between 24 and 30" wide with the outer panels removed,it won't weigh much Here's a couple of pics of my 55" Delta @ 7.3 lbs(all balsa&ply const.)You can see the panel breaks in the pics.
Hope this helps,Rich
|Nov 23, 2006, 08:25 PM|
I was watching the History Channel the other night and they were talking about previous jets that didn't get chosen. The XF-108 RAPIER was one of these planes. This was to be the escort fighter for the XB-70 Valkyrie. The idea of fighter escort for bombers died out and the plane was never built except for the prototype. I'd like to build this plane someday.
|Nov 23, 2006, 08:31 PM|
Hey man! Where ya been? How'd that A-10 ever work out? Maybe I missed it, but I never saw what happend with your A-10 and I really want to know, did it ever fly? Thanks man!
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