theosoarus

Thx guys.
I have the MB346 from Cmodels with a P140rx so I know how well the Yak would fly.
My thinking is 2 x100s or 2 x140s price wise is on par with a single 300....
Perhaps a custom Tamjets byf-pipe might be a good insurance policy too
cheers

jeff sewell

My Feedback: (1)

Personally I'd be more than happy with the stock pipe or pipes. They are built quite well and the Yak one particularly is a solid peice of work.

Jeff

theosoarus

Ok that's good to hear. Thanks

jetnuno

Hi

A P300 wouldn't be too much... https://www.youtube.com/watch?v=9yramch2rNg

In fact I am planing for 2x 140-160

Br

Springbok Flyer

Hi Jeff,

Any chance we can get a photo of your single turbine installation and a photo of the single pipe. I am considering an AMT Olympus HP with bypass and would like to see how much space there is before I order my kit.

Mark H,

The two custom tanks you have in yours, are they available commercially - if not, any chance you can show me some photo's? I like the idea of fewer thanks plus a CAT.

Cheers,

Jan

heraldoboldrin

Nice.. can someone post internal pictures of the yak.. and more information?

Svein Erik Riis

Here is my Yak at last. Got it last week. Very happy with the cs.


And thank you Jeff Sewell at Zedjet.com for all the help I get from you.

Mark Vandervelden

Hi Svein

Wow, Your Yak look fantastic in you chosen colours, I can see your very pleased with it.
Evan having one myself I still cant get used to its shear size each time I see one!
Good luck and enjoy fitting it out, be sure to keep us up to date with your progress.

Regards Mark V

Svein Erik Riis

Thank you Mark. Yes, I will post updates as it progress.

Springbok Flyer

Hi Svein,

Congratulations, how long did you wait for it?

Jan

Svein Erik Riis

[/QUOTE=Springbok Flyer;11866503]Hi Svein,

Congratulations, how long did you wait for it?

Jan[/QUOTE]


Hi Jan

Had to wait 4 months cos custom cs.
But when they finaly sent it, it took only 3 days from China to my door.

Svein Erik

Svein Erik Riis

Hi Mark

Did your uc go all the way to the bottom when you set the plane on it's wheels?
Mine did, no suspension there. Think I have to fill a little oil in the damping cylinders.
Or what do you think?

Mark Vandervelden

Good Morning Svein

My U/C on the Yak did sit a bit low on one side when it first arrived, but after I found the valve at the top of the strut units and pumped them up with air it sat fine.
The full size Yak sits with the trailing arms on the U/C more or less level, you don't whant to rase the tail to high or it will sit nose down.
There is oil in the struts to dampen the arrivals, I know this for sure as one of mine would weep over time, I'm guessing its silicone oil like the "car buggy" guys use.
The struts on my first JL Vipers were pump up with oil dampening, I had to top those up with air once or twice but never needed to put more oil in.
I think the natural friction on the seals and joints is enough dampening for our needs?

Here is a pic of the full size in the colours on my new one now on order
Note its slightly tail down despite not having the weight of any ordinance.

Malcolm Kay

My Feedback: (11)

Hey Mark And Svein, I just wanted to give you a heads up about a point on my YAK. Whilst taxi testing the plane suddenly lost all steering . when I checked the steering arm had broken off completely.... I removed the complete retract and and found that the the steering arm is a very thin piece of carbon fibre that is screwed to the top of the strut there is a large hole in the center for the steering pin and two smaller holes for the securing screws which are themselves counter sunk so that the screw heads do not interfere with the turning operation... this leaves absolutely the tiniest amount of carbon fibre to secure the arm... mine broke in two pieces across those screw holes and left me without any steering.. the part is doomed to fail it is much to light for the job and as you know carbon fibre has great stiffness longitudily but if you bend crossways it snaps...... remedy,,, I made a new arm using the old pieces as a pattern , and used a 1/8 piece of aircraft grade aluminum result works perfectly...MK

Springbok Flyer

Malcolm,

This is why my motto for buying newly released models have always been: 'Wait for customer R&D to perfect the model before buying'. My experience have shown that models bought and built about 12 months later produces a better tested and sorted out model with far less frustration to the modeller.

Any chance you can show us a photo of the problem part and the 'fix' you've made? Anyway, thanks for sharing the issue with us.

Cheers,

Jan

Mark Vandervelden

Hello Malcolm

Thanks for bringing this to our attention, sorry yours has had an issue and hope it did not spoil your day. As it happens my first Yak was a early version and had a different nose retract unit to the later ones and the steering mechanism is as shown earlier in this thread. These ones have a very robust clamp on arm at the top of the steering column and are not likely to fail. I believe the newer nose retract units have a more traditional up/down locking mechanism rather than the "locking ram" employed with my one and the steering servo is mounted lower down. However I suspect my new Yak that's due to arrive sometime in late September early October may well have the lighter Carbon steering arm you have described so I will have a good looksee and head you advice to modify accordingly. Svein on the other hand has a very resent Yak and will no doubt give it a fresh look, it would be nice to see a pic or two form one of the newer nose leg setups.

Svein Erik Riis

Hello.
Yes, I will take some pics of my uc and post it here to day.
Thx for bringing this to attention.

Svein Erik Riis

Here are a few pics of my nosegear. Think I will change the carbon units with metal.

Mark Vandervelden

Hi Svein

That's a very different retract unit from the earlier one that I had, that cylinder would have its work cut out, have you tried it, if so at what pressure will it lift the leg?

I would think the servo mounting plate would be OK but can see how the actual arm itself might be weak were its fixed to the top of the leg as described by Malcolm.
A short threaded rod with a ball at its outer end screwed into the top hole replacing the set screw at the top of the leg might work as a replacement arm.

There looks like there is a lot of leverage over that carbon retract mounting plate from such a long nose leg .
I'm guessing being made of carbon its meant to fail before the leg its self bending or the mounting bulkhead tearing away from the fuselage skins.
Its a fine balance between it being "strong enough" for general use but still being able to fail in the event of a knock that would damage the structure around the bulkhead.
Hopefully it would partially fail and not snap off like a carrot, in any case a spare plate in the flight box might at least save a lost days flying

Starrjet2

Guys Svein,s gear is the same as mine, which explains the difference. Between the early models landing gear and the. Later , because I spent a half hour with a flashlight and a magnifying glass searching for the valve that Mark used to pump up his struts! And it's invisible ,,,!,, another thing. When I removed the main wheels to lubricate the O ring brakes and installed them on the axles I found the brakes rotating in the hub because I had not managed to push them all the way onto the axle shaft,,JL addressed this by tapping and threading the inside of the axle shaft so you can screw in a bolt to the back end of the axle and pull it in from behind the assembly thus securing it tightly home on the drum! Good thinking Batman!!! MK

Malcolm Kay

My Feedback: (11)

here is the offending piece

Springbok Flyer

Thanks Malcolm,

Let us hope JL monitor this thread and improve the part. If they don't it will reflect badly on their ability to adjust and improve their models.

Cheers,

Jan

bons

HI guys. I am new to this thread but have been looking at the Yak and find the information very Interesting - also very good looking planes - all schemes. Mark, sorry if I missed it, but have you flown yours. Same questions to others. What engines are you all planning to use.

Tony Bonanno

DrScoles

My Feedback: (18)

Mark, or anyone else who has built the Yak, can you share some install pics? I just got mine last night, trying to sort out where I should put everything. Want to make an attempt to have all the switches and fill ports in the speed brake opening or out of a hatch so I don't have to touch the canopy.

i3dm

My Feedback: (51)

Guys,

which air valves do you use with the 2mm air tubing for the YAK 130?
thanks.