Yes, mine has been the same since the thread started and its still good! I really like the scheme, my friend Paul has the one I posted here (first one of the series production) and I really like it as a scheme. I guess you have snow till March?

Dave

Helihover, all pipes stretch a little bit when getting hot so its not a good idea to secure it in both ends :-) The inner pipe is th one that moves most but also the outer is a litle bit alive.

Eivind

Yep - at least:(

Time to overhaul the air system on one of my main gears and I have questions... This is the stock CARF supplied sport gear for the Hawk. A leak has developed suddenly and is a consistent leak starting after about 175 flights. It is coming from the small O-ring that acts as a seal for the piston shaft as the piston moves back and forth in the cylinder. It is leaking when the main gear is up and the air pressure is held between the piston ring seal and the O-ring in the block that the cylinder threads on to. I can hear air leaking and see bubbles forming at this seal. I guess a small piece of debris may have cut or scored that O-ring. My CARF rep here in the states is sending me a new piston but after removing and cleaning and replacing the O-ring and having it continue to leak, and inspecting the piston shaft and finding no defects, I think I need a new O-ring. It is quite small. Does anyone have experience with this or specs for the tiny O-ring? I will also contact the manufacturer of the gear but thought I would ask here first and hopefully source the O-rings quickly and or locally. Thanks

Its a common one. The rod material used is quite corse grained and it seems to slowly wear the rod seal O ring in the cylinder mounting block. The old girl thread starter has had two changed over the last five years. Last one was on the nose unit end of last year. I have some of the seals here, but maybe Airtech could give you the spec and you can source locally. Its nothing special.

Couple of shots from Tuesday at CJ 61.

Dave

http://www.rcuniverse.com/forum/atta...mentid=2059450http://www.rcuniverse.com/forum/atta...mentid=2059451http://www.rcuniverse.com/forum/atta...mentid=2059452

Thanks Dave. I will have just contacted Airtech and hopefully they will reply soon. Or I may have to get the seals from you. It sounds like you do not have the O-ring size? I could pop it back out and measure it but I'm not sure I can measure an old O-ring accurately.. Those rods are not shiny smooth, and we fly in very dusty conditions here in CA, so wear is surely a by product.

Erwin says 3.0mmx1.5mm for the mains and 4.0mmx1.5mm for the nose. He said 70 shore material so probably means the common BunaN-70 nitrile O-rings.

In the office again now so I could have measured them. Think there are a mix of sizes out there, my mains and nose are the same size, he's made lots of changes over the years!
Guess you will get sorted quickly and have a few dozen for spares!

Dave

Some more pics from Classic Jets #61
http://www.rcuniverse.com/forum/atta...mentid=2059928http://www.rcuniverse.com/forum/atta...mentid=2059929http://www.rcuniverse.com/forum/atta...mentid=2059930http://www.rcuniverse.com/forum/atta...mentid=2059931http://www.rcuniverse.com/forum/atta...mentid=2059932http://www.rcuniverse.com/forum/atta...mentid=2059933http://www.rcuniverse.com/forum/atta...mentid=2059934http://www.rcuniverse.com/forum/atta...mentid=2059935http://www.rcuniverse.com/forum/atta...mentid=2059936

You finished yours yet?

Not yet

Gents,

been following this for some time now and have a couple of questions if thats ok?

Dave, how is the EDF Hawk coming along? any further developments or pic's? This version is of real interest to me.

Does anybody know of an EDF (Schubeler Fan) version flying within the UK? Would love to get a look at one and have a chat to the pilot. Also could do with a noise test as my current site operates strictly to the 82db limit suggested by the BMFA and I am sure you can appreciate it's a lot of time and money to tie up in a project that may not be allowed to fly at my prefered site and we are not allowed to fly turbines! (Boooo).

Fabulous work with all the help on here guy's, it's refreshing to find a forum where nobody's moaning! Top work and many thanks.

Dan.

:D

Dan

Not touched it for months again, but its a high priority for early this year! I moved the fuselage yesterday onto the main work bench. It really does not need much work, its just time around other business stuff. There isn't another in the UK. Based on our Spark experience with the DS 77HST it will be well inside 82db, the Spark HDT is very noisy, the HST silent!

I'll post here as it progresses and obviously when its flown.

Dave

Hi Dave,

many thanks for the update and also your feelings on the noise issue. Gives me confidence to pursue further and I look forward to any further updates going forward.

All the best for now,

Dan

Hoping to do some more work on the EDF Hawk this coming week, Ready to install the thrust tube rolled from mylar sheet. managed to open the rear of the fuselage to the largest possible opening as we don't want high velocity air (minimal compression on the fan swept area)

I need some help friend.
I'm flying my hawk end i am in my fifh flight. All is very good but Its seems to me they are requiring lots of up trim. I took some pictures so you can see the horizontal tail.
CG is at 195 mm and the turbine is instaled so the thrust vector lokks like the blue line.
Any comment?
Regards.

You can go back to 205mm on the balance, but elevator trim looks almost perfect for your balance. I have 4-4.5mm underside of the tailplane to the rear cover split line. This is correct

Dave

Dave,

Just had a look in the manual again that says exactly what you said.
Sorry for asking this..:o

Kinda figures! I wrote the manual :D
Not a problem anyway.

Best Regards

Dave

Hi David or anyone
Do you know if it is possible to fit electric retracts, wheel brakes to the hawk perhaps using the carf struts.
I am trying to get away from air retracts.

Not sure if Airtech Germany are doing electric drives yet...but nothing would make me change! Latest set of electric gear I had here were for a 2.6 Futura and it took an hour just to get them to operate a full cycle. Most of these electric gear guys still have a long way to go IMO

The thread starter still has the original gear, I have changed the nose O rings end of last year and I had a minor issue with one of the mains back in 2010, other than that I have done zero maintenance...

I am a massive fan of electric retracts and they go in anything I can possibly put them in - the Electron units are by far the best all rounders in my opinion. Have sold quite a few CARF Hawks recently and worked closely with one customer to try and get an electric retract solution. We found it wasn't going to be entirely practical or cost effective with off the shelf parts in this case so the customer defaulted back to air. In most cases however it ends up being the same cost or sometimes less cost than an air system with electronic valves etc.

I am determined to make it happen so will have another look on the next batch of Hawk kits we get in - electric is an absolute no brainer where possible, I have many hundreds of flights on my own jets with Electron units without the slightest issue - ever.

Electric would be the way to go if I had tomfl
it again
rlectrons are really the best but for now therr is no good solution

airtech was converting the originals to electric but cost is way up there of almost 2 sets
so I would not do that

Colin, you are funny...

Thanks Dave - you are a sweetie ;)

Hi everyone,

I'm currently refurbishing my Hawk, whilst I'm waiting for the paint masks I thought I'd add some rivets but can't find any 3 views that show the kind of detail I'm after... Can any one help ?

Here re are some photos of what's been going on in my workshop (-: http://www.rcuniverse.com/forum/atta...mentid=2075602

Looking great there mate! Nice to see some extra details on the model.

I spent quite a long time searching high and low on the net looking for 3 view drawings that showed panel lines and rivet details on the hawk and came up empty handed, when I was detailing my Flyfly foamie Hawk.

These are a the best I found, together with plastic models of the Hawk. It wasn't good enough to burn rivets in but at least with the foamies smaller size the tail cone raised rivets and panel lines was enough.

I'm working on my Skymaster hawk at the moment and needed some more details about certain parts of the hawk. Just realised that the biggest airshow in Oz is on this weekend so I'm flying down to Melbourne in a few days time with a modelling buddy of mine because the RAAF will have at least one of their Hawks there so hope to get one or two pic's of it.

All the best

Dave

Dave,

Are the dummy underwing flap fairings still available? Looking for a set to add to my SM X-treme Hawk.

Thanks

Paul

Cheers Dave and Dave,

I found a really good walk around of an Ozzy Hawk, Will post the link if I can find it again

Matt

Paul

Not at this time, mould was never meant for series production and we have done 30 sets now. New moulds are in the process though..hey Matt ;-)

Dave

Dave,

Thanks.

Please post here when they do become available again. Would love a set.

Paul

New moulds will be here soon (-:

Finally cleared some other jobs so looking at the EDF Hawk again. Tail tube is now in and that allows me to work forward.
http://www.rcuniverse.com/forum/atta...mentid=2075916http://www.rcuniverse.com/forum/atta...mentid=2075918http://www.rcuniverse.com/forum/atta...mentid=2075921http://www.rcuniverse.com/forum/atta...mentid=2075922

I was wondering what had happened to this project! Looking forward to the maiden flight impressions!

Likewise, can't wait to see how this turns out.

Just been too busy with other things, I'm having a big push to find time on this and the Habu 32x, so I'm clear for some new incoming boxes!
Wanted to use a UP3 valve as I love them, but two JetTronic valves are much lighter, so going the same way as my original RA Hawk that has not had many air issues since built in 2009.
Having decided all these things I can crack on.

Top stuff Dave, appreciate all the info you provide. Do you think it's possible to convert an airframe from turbine to Edf? Got my eye on one.