smcharg

My Feedback: (1)

Much appreciated gentlemen. I've opted for the carbon laminated birch and will use 1/8" and 1/4" so as not to change the height of the turbine. It'll be a bit before I get it all done and all parts in (waiting on servos) but I'll take some pictures of the finished product and post them here.

I'm surprised no one has really said anything about the new K45G3 vs. the G2. It's 250 grams less and is the same size as the K30. I spoke with Dirk from Pacific RC Jets and he said that it turns the same RPM as the G2 but they've refined the blade design and pitch to keep the same thrust and RPM. I'm excited to run this little dude.

Happy New Year!

Razmo

My Feedback: (2)

Hi Guys,

I'm looking to go 55 mm JP Hobby wheels/brakes on the mains with a matching nose wheel. Are the stock strut axles 4 mm on all three axles?

Also, is 55 mm too large for a matching nose wheel? If so, does anyone know how large I can go without effecting nose gear door closure?

Thanks,
Raz

RCISFUN

My Feedback: (44)

I just measured my Axial's as I need to order the 55 mm wheels and brakes, they are indeed 4 mm.
I have not checked my nose wheel yet.
p.s Dreamworks shows them in stock

Razmo

My Feedback: (2)

Thanks Rich.. Spoke with Neil of Sebart. Says all three struts are now 4 mm..

Does anyone know whether the 45 mm JP Hobby wheel for the nose would pose a problem with the gear doors?

Thanks,
Nick

raydar

With the jp upgrade struts relacing the front wheel with a 45mm fits fine and clears the gear door, I done this mod and wish they shipped the set with a 45mm front.

Razmo

My Feedback: (2)

Appreciate it!

a25afm

I have the Red, white, gold mini avanti. Does anyone know the color codes? I need to purchase red ultracote.

kohersh

I have never had a micro turbine like this...it is unfamiliar territory for me. Need some help with the pipe set up on this used Avanti I picked up. fwiw- it has flown in this config
My existing non named single wall pipe has a 48mm ID. Do you all think this was the kit supplied pipe intended for a 20-30N motor? I have read through this thread and seen reference to a 50mm Grummania that was supplied with the 30N kit or early K45...but I see Grummania has a pipe today specific for the K45/X45 as well as another pipe for a K45-70.


The reason for asking is to determine how far I am mounting this K45g3 from the pipe and to determine if I am going to shift my pipe a little further out the back of the plane. See pics
From the Grummania pipe mounting pages they suggest the following distance between the exhaust edge of the motor and the 'top of pipe" (not the bell): For 15-30N pipes 20 mm For 40-80N pipes 40 mm, so at what diameter do the pipes graduate?

smcharg

My Feedback: (1)

I'm setting up mine right now and have purchased the K45G3 as well. I've spent some time on the phone with Dirk at Pacific RC. My pipe is being built by Peter Liu at Baja Hobby USA. I received the pipe and lined it up and it was about 1 1/4" short. He gladly took it back and is building me a new pipe 1 3/4" longer because I wanted a little sticking out the back of the Avanti. I just like the way it looks.

Back to the point.....Dirk said to absolutely no question mount the engine so that there is a 1" space between the end of the engine and the start of the pipe...NOT the bell mouth. Take that out of the equation completely. It must be 1" from the beginning of the pipe. He warned about a greater distance. Since the G3 is the same size as the K30G2, that's why you are experiencing this issue. It's 250g lighter and much smaller but produces the same thrust because they changed angles on the blades at the same RPM.

kohersh

Any idea what the diameter of that Baja pipe is?
It looks like my pipe is eating my K45 like a snake. Clearly the 40mm is too much. 20 seemed right, make it 25mm, splitting some of the difference and still getting to that 1 inch.

smcharg

My Feedback: (1)

When I get my new pipe, I can measure for you. I already sent the one that was too short back to Peter. My original pipe, however, looked like the bell mouth was eating the little K45 also, just like in your picture. Almost the entire "exhaust" part of the engine was in the bell mouth. It'll still look that way. Dirk said don't worry about that at all and it's the distance as discussed that is what really matters.

I'm trying to mount the G3 where the tab to the engine is centered on the rear existing bolt hole. With as light as this engine is, I'm wondering if it's going to have a huge static margin without doing something in the back. I considered placing it all the way against the rear bulkhead on the engine mount rails but decided to bring it a little more forward to make it easier to get to the back of the engine. I'll take pictures as soon as the pipe gets back from Peter.

smcharg

My Feedback: (1)

If it helps any, here is my original dual-walled pipe right before I sent it back


If I kept it, this is what it would have looked like all the way against the back of the rails


This is what it should like like according to Dirk which is why I'm extending the pipe 1 3/4" which will give it 1/2" sticking out the back of the plane mounted as I suggested in Post #861

raydar

For all it helps 20mm from pipe (not bell mouth) is perfect for my k30's with 46mm ID pipe.

kohersh

CM Jets 1.3L tank arrived yesterday. 170grams with his installed clunk line seems pretty darn good, lighter than a Dubro tank of similar capacity

BarracudaHockey

My Feedback: (11)

Those are nice tanks.

kohersh

Anyone flying these larger capacity tanks care to chime in on how CG changes with fuel consumption?
Using round numbers "IF" fueled all the way to 1.3liters lets assume 1L of fuel burned landing with a reserve, that is approximately 850grams or 30 ounces, or 1.85pounds of weight in that liter of kero shifting around in the airplane. At 145mm aft CG all of the fuel is forward of the CG.
Now I go into 'overthinking' territory by sliding the tank aft nearly against the motor the tank, it could be secured with around 30% the volume of the tank aft of the CG, which would reduce the shift by some margin.

Anyone flying these larger tanks- do you notice a change in tendencies?

raydar

It would seem that the latest batch of Sebart jets are coming with the JP upgrade struts as standard but minus the brake wheel, least that explains some of the recent price increase.

smcharg

My Feedback: (1)

kohersh I got an email from Peter saying my pipe for the G3 will be shipping tomorrow. Do you still want measurements when it arrives?

For those that may not have started theirs, I ran my new K45G3 Saturday for the first time. It is different than the G2 version and substantially smaller. Here's a video on the first run. Sorry for the mic clipping. These suckers are loud!

BarracudaHockey

My Feedback: (11)

One thing I noticed right away is that it does a one-run cool down, it doesn't pulse the starter to cool down.

smcharg

My Feedback: (1)

Agreed! That kinda worried me at first but the G3 apparently does that. It does seem to cool down quickly watching the GSU.

kevin

My Feedback: (2)

I have a cmjets 1.7L tank in mine. yes i do notice that the airframe will start to climb as the fuel nears about the half tank mark. it is very slight, so i do not retrim or adjust during flight. i balanced mine at the recommended CG but with the uat full and also about 15 percent fuel in the main tank. my tank is back to where it almost touches the starter motor on my k45.

RCISFUN

My Feedback: (44)

Been working on my Avanti build.

I ordered the new Grumania Jet’s pipe specifically designed the mini Avanti and the Xicoy X-45 from Germany, order placed Jan 2nd, pipe delivered Jan 16th.

It was very well packed and the pipe looks like a work of art!

The new design has a bell mouth that fits within the Avanti formers with no modifications.

I created a laser cut template that locates the pipe at the recommended distance of 30 mm from the tail cone of the X-45 to aid in the installation and centering of the pipe. I also created a paper template for drilling of the bell mouth for the mounting brackets. The pipe came with mounting strap hardware to allow fabrication of the brackets.
I also created a laser cut tail cone adapter to hold the pipe.

Bob_B

My Feedback: (11)

Very nice Rich!

smcharg

My Feedback: (1)

Impressive Rich! Want to do one for the K45G3? What a great idea!

RCISFUN

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I would if I had the correct drawing/ dimensions
I actually started to create a Jet Central template for the Hornet and the Kingtech K45G2 based on a drawing I found...