pedro w rdz

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Ok. Got this. War bird from a friend all it needs is 2 receiver batteries. N engine. I can't afford a moki.
I think will get a dle 170 with 3 blade prop as power plant
Hope this thing fly straight. Any. Input. Will be more than welcome.
Specially if any one around has one of these

Thanks.

Pedro W Rdz

pedro w rdz

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No body ?

quist

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Not sure that motor will fit. Maybe a da 120.

kram

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Best-flying warbird I ever owned.

Like a Cadillac in the air: solid, stable. Practically lands itself

Worst thing I ever did was put a Moki in it: eventually caused loss of the plane (it doesn't handle very well dead-stick)

Cowl is huge: check the internet for motor dimensions of whatever you're putting in it. I believe the Moki 215 had a diameter of about 11.5 inches and it barely fit.

Will need at least a DA 100, maybe 150, to fly with authority.

Only problem area I had to reinforce was the wheel wells and gear-mounts. Lemme know if you want details

pedro w rdz

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Thanks for answering guys

Mustang51

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I had the 3rd flying 190 in the country about 7 years ago. Best flying warbird I ever owned. Flew like a pattern plane. I had a 3W 120 in it and it was over powered. Flew around on about 1/2 throttle. A 100 would fly it just fine.

kram

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Pedro:

Be careful in your calculations about the engine and the cowl.

Remember that the cowl is slightly wider in the back than the front and the maximum diameter of the engine will hit the cowl somewhere between 1/2 and 2/3 of the way forward, so you don't have 12.5" for the engine.

Also, some 2-stroke engine spec diagrams aren't real clear as to whether the "head-to-head" measurement includes spark plug and cap, which can be an inch or more

The widest part of a Moki 215 is the valve lifters at 11.22" and they had no more than 1/4" clearance where they laid in the cowl for me: a very close fit. Too close, really to allow for vibration and bending, etc..

The flaps are not a part of the original kits (at least not the early ones). I cut mine out of the relatively thin underwing skin and fortified both the flap and the flap bay with stiff balsa you can see if you look closely at the picture

I flew with zero flaps, landed with 35 to 45 degrees, depending on wind.

No mixes. All my warbirds have some exponential on the low setting for elevator and ailerons. Makes me look like a better pilot than I really am.

If you have experience flying warbirds, you can easily land it in 400 feet. Longer is always better, of course.

It takes off and lands fine on grass

Remember what I said about intrinsic flimsiness of the gear rail attachment points. Better to fix it first rather than after. My maiden flight was spoiled by the left gear punching through the wing-top after a near perfect landing on a grass field

If you start to feel overwhelmed by the project and would like someone to take it off your hands, lemme know

pedro w rdz

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Wow Kram  your bird looks awesome in the picture I can see the landing gear Issue     so I should reinforce. Where the retracts are screw to the wings  right 

pedro w rdz

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Ok.  

butlern

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Was that question about the date the picture more of a comment on the good doctor's shirt?!?!?

Hahahaha... just joking, Mark.

Best wishes for the event (Wish I was closer!!!).

Noah

kram

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Noah:

Why, I resemble that remark!

My 14 year-old pretends she doesn't know me when I wear one of those shirts.

Feels bad not seein' you around in Iowa anymore.

So, is it hot down there in OK? (That's a jab, not a real question. I've got an uncle in Chickasha)

mt

glazier808

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Hey now.... that shirt is good for Sunday in Hawaii!

Casey

kram

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Pedro:

I bought the kit and the plane second-hand in 2005, so it's at least that old.

I spent 2006/2007 building it, struggled with the Moki for two years, then

That picture after the maiden is 2009.

I lost the plane due to Moki in 2011

Good to know your cowl is significantly bigger than mine. In case I buy another one

Strengthening the landing gear attachment is more about the dorsal surface of the wheel wells than the actual gear rails

I had good strong gear rails when I cracked the wing on maiden. The problem is the dorsal surface of the wing is quite thin: strong enough to fly, but easy to push a rib through the skin with even the slightest of runway imperfections.

I resolved it by reinforcing the underside of the dorsal surface of the wing (the deep wheel well) with 4 layers of laminated 1/32" ply (so it can be strong but mold to the airfoil) over an area 10" long and as wide as the entire distance from the main spar to the leading edge, then built a new set of 1/4" ply ribs and 1/2" ply gear rails and epoxied it all to each other and the main spar and leading edge. Yeah, it took me two weeks, but I never had any problems, even with rougher landings, after that.

I wish I could pop that assembly out of the wreck and into my new one! But that's the main beauty/function of it: custom-contoured fit and epoxy stickin' to the whole chicken.

Maybe they have addressed the issue in the newer kits?


Mark

kram

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Pedro:

Figuring out the Focke-wulf CG is one of my fondest moments in the hobby.

The day before my maiden, an Owatonna Committee of some of the finest minds in RC aviation (including Dino DGiorgio by long-distance cell phone) helped me determine the optimum CG.

In the air, it proved perfect.

It's marked on my fuse, which I still have. I'll try to get a pic for you soon.

I suppose it might be different if they changed the molds when they made the cowl bigger?


mt

2walla

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I have one with a moki. And one I am setting up with a 3w106. The moki is a bit overrated but hey it is a hobby. With the moki you need the elevator seros in the stabs. With a twin you need to put all the servos as far forward as you can. Most 150 sized motors won't fit without pRotruding. Double check your measurements. Put a couple formers in the fuse. Airworld fuses are floppy. Landing gear mounts are not that strong for a reason. The wing is tender and significant reinforcement in this area mat mean just a larger hole is left behind after a bad landing.

kram

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2walla:

I agree on both counts.

I had to put two big Ni-cads in the aft fuse to balance it with the Moki. I'm sure with a 3W, lead will be needed up front.

Does the 3W106 fit in the Fw cowl without cut-outs for the plugs? That is a SWEET engine.

I understand what you're saying about the gear mounts. A general rule in RC aviation is when you reinforce a break point, you just move the break point up to a more expensive place.

For this particular set-up, however, I theorized:

1) My maiden landing was SO smooth the prop didn't even stop turning when the left gear broke, so the majority of my future landings were not going to be any smoother, so I had to improve things somehow

2) This plane is such a smooth flyer and lander that "bad landings" will be uncommon

My second-hand kit came with a big long thick swath of carbon fiber cloth glued to the inside of both fuse sides. Not sure if that was factory-installed or after-market.

pedro w rdz

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Ok I asked for measures do dle170 plug cap to plug cap and 13.3 inches. I will have to make 2 small holes on cowl for plugs Uffffffff

pedro w rdz

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Where did you all go are you guys flying jeje   Enjoy 

kram

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Pedro:

Sorry, busy hosting my event last weekend (then recovering from it)

The CG is best set at the second rivet line back from the "exhaust port" on the molded fuselage

Another way of describing it: extrapolate the leading edge all the way to the fuse side with a straight-edge. It's 5.5" back from that point.

I would show you pictures, but my fuselage isn't in very good shape in that region!

If you post a full length and a front half pic of your fuse, I can show you where.

It seemed too far forward, but it flew great.

kram

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Here's a pre-crash photo of my plane, edited with a vertical red line to show the correct CG

Good Luck!

pedro w rdz

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Hey Kram 

pedro w rdz

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Ok started installing motor On these bird.
Here pictures

pedro w rdz

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While installing  motor.  Found. That the canopy air piston was removed   So i have to ask 

vertical grimmace

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Mcmaster Carr

pedro w rdz

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Vertical grimmace