sparky4lawndart

My Feedback: (10)

Is that a TIG or MIG weld?

Reverend

My Feedback: (3)

My brother in law did a TIG weld.

miklos

My Feedback: (38)

May I suggest something..... A hardened gauge pin is the best material known to stand up to the requirement. Keep in mind I'm not in favor of ruining a high precision tool, however, replacements are relatively inexpensive. This offers the best fix that I think would be available.

Hot Rod Todd

My Feedback: (1)

I think drill shafts would be plenty strong, but not so brittle that they would break. Hopefully Robart will come up with better parts some day, but I doubt it will be real soon.

Here's an example of one of mine from a very mild ground loop. I had the dual pin conversion, so you can see that both pins bent. Not really any easy way to straighten them. The dual pin conversion is sensitive to alignment too, so it would be hard to get them right. Looks like putting new harder pins in place may be the solution, I know it won't be easy to get them lined up though.

SWORDSN

My Feedback: (13)

I have this model to assemble with air retracts.It seems to me that if you install very hard pins,the damage will be elsewhere.Something will probably give.Anyone?

Hot Rod Todd

My Feedback: (1)

If you have the "normal" pins (not too soft) the first thing to give is the wood mounts. Once you strengthen the mounts the next weakest point is the pins. Single pin systems can even break the plastic locking block and it will blow out the top of the wing. Not sure what would be next. I would think you could bend the struts or the strut mount on the end of the trunion.

With the soft pins, none of this will happen. The pins will bend with a very mild turn-in that puts weight on one side.

We all know it's an FW-190. Long gear angled in makes it prone to damage during a poor landing or ground loop. That's just part of flying an FW-190 with scale type gear. I don't mind doing some work on occasion, especially when I made a mistake that stresses the gear. Totally different than the soft pins that bend in situations that should cause no damage at all. If my landing gear is going to function as a "fuse" to prevent damage, I'd prefer something besides a $40 part with a long lead time was the weak link.

kwik

Worrying about the next weak point.......Mine has worked for a long time, some hard landings, some soft. The next weak point wont give in as long as you have normal landings, and dont do a 90 deg turn on the ground while still having some speed.

hpergm

I am one of the "lucky" ones that got gear from the first batch with the "OK" pins.
The next thing to go is indeed the wood mounts. Nothing a couple of CF pins cannot fix...
I think this reinforcement would be OK for normal stresses but would still allow the Chinaply to delaminate in case of a harder landing. We shall see.



Note: this damage was done by the landing on the maiden video I have posted a few pages back...
http://www.rcuniverse.com/forum/rc-w...l#post12042745

kwik

Yes, but its an ARF.....so....hehe.

And you landed the Focke Wulf on asphalt, in 100% crosswind.....

A Sist 190 would have tackled it, but it has carbon all over the place in that area of the wing, so it costs more.....

hpergm

You get what you pay for... correct.
Comparing a SiST with a TF is like comparing an MX5 with an Aston...
Too bad SiSt is no longer available (from what I know of)...

kwik

True. But now you get the Sist 1/4 scale 190 Anton.

It is the ultimate warbird. Requires a proper radial up front, of course.

A bit big for me. I think a 1 / 4.5 scale is maximum size for me, like the Vailly Fw 190.

1/4 Fw 190 is so big that it gets cumbersome getting it in-out of the house, and in-out of the car / trailer.

But it would have been the ultimate kit.

SWORDSN

My Feedback: (13)

I'll keep that in mind

ptdan

A guy named Dieter Karer has the molds from sist, he makes the Anton in 1/5 and 1/4.. Lives in germany

MX240

My Feedback: (4)

I guess I got lucky also by getting one of the first Robart 190 gears as I haven't had that problem with pins.
The wood mounts are better then TF P-51 mounts.
I never thought of running CF pins through them.
What I did was run a one piece of maple from the back of the leading edge (cut out for leg) to under the front screw mount.
I drilled out the Robart holes to take a larger sheet metal screw that goes all the way through TF's plywood down into the maple.
If you can keep that front edge from heaving up everything else is ok.
Yes, I have had to replace the plastic cam blocks a couple of times. But, that is ok with me.
Make all landings with full flaps......If you have engine power.......dead engine....no flap landing.
Jim

Reverend

My Feedback: (3)

Wow, my Würger got a prominent space on the cover

Cant wait to fly it again this weekend!

steph69

Nice congratulations.

roy batty

This is why you should convert to a second cam/trunion block as showed by Tommy_Gun on pages 73-75 of this thread.

rigofly

This is my mod to gear supports. Added two pins (as previous photos) and ply reinforcement on top

sparky4lawndart

My Feedback: (10)

Ingenious... thanks for the great idea!

rigofly

Another minor and simple improvement for wing servos




and pneumatic hook-up realized with "Festo" tubing with plastic tube collars

jagdpanther9

hi guys, I didn't vanish without a trace just had another back/neck surgery double fusion so that took me out for quite a while this summer.doc. just gave me the ok to do more and lift more so this is one of the first things I wanted to do. I was able to get a maiden flight today and some video. nothing real exciting but I was very pleased with the temperature that my 70cc twin ran at right around 190-195 deg. and that's what it ran @ without a cowl on the test stand. I did baffle the cowl and I cut holes in the firewall and made the side vents functional like I saw others do as well in this thread. on my 2nd flight I ran it a little harder for a good 5 min flight and I had the same results for temperature 190-195 deg. I really like the way this model fly's very stabile and it settled in so nice and smooth on landing both flights. the electric start really helps out with my back probs. such a smooth idle @ about 1300 rpm. I hope I can keep greasing in my landings as it sounds like there are plenty of problems with the robarts, mine are pneumatic and the right one doesn't always like to retract and lock up.i'm working on that right now. here is a link to the maiden video
https://www.youtube.com/watch?v=YU1lOpVqdzg

Hot Rod Todd

My Feedback: (1)

Jagdpanther, when your retract will not lock up it's typically because you have a bent pin on the trunion. If it's holding where it's at and not bending any worse you can sometimes delay a trunion repair by spacing up the gear a bit so that the wheel doesn't hit the wheel well that is preventing the lock.

jagdpanther9

those are dreaded words todd, cripes i landed smooth as silk on both flights . they work fine on the hard stand. there is another guy flying a TF 190 who said he had to adjust his gear doors to deflect air and help push his gear shut . i think that i didnt have enough air pressure and i used some graphite on the locking cams so if that dosn't help i will pull them out and inspect.i just cant imagine that they are bent from these landings but then after following all of the posts and pictures of bent pins............

Tommy_Gun

The pins don't typically get bent from the landing forces.
It's usually caused by side loading the gear if the plane veers to one side or the other on landing roll out or even on a squirrelly takeoff.

jagdpanther9

my landings so far have been very smooth take off has been great . all i can think is that when i installed them and was adjusting them they came down like a switch blade knife. i tuned the air valve to make them not as harsh. i guess we will see next time out as they are working great with just 30 lbs of air on the hard stand. i am just so pleased that my engine runs so well and the temperature is tolerable, that was my main concern.