Midas D.

DrV,

That's exactly what happend to mine, oscilating all the way, no matter how many gain.
It turned my head upside down and i was worrying that i was killing my tail servo's.
So bottom line, the gyro is out, and said again this bird really does not need one, not even close.

The next step is finding the perfect gears for it, cause that still is a bit of an sad story on the whole thing.
I ordered the the Tam struts for on my V2 gears, lets see how that will work out.

F1 Rocket

Curious about the gyro issues you guys were having. I know of a few Mini Avanti's flying with the Cortex and they all work very well. FYI, on the Tam struts if you have Tam make these for the 5mm pin used on the newer retracts be careful tightening the sets screws. There is very little thread with the 5mm hole. We had him up size the axle hole to 5mm as well to fit the JP 55mm wheel/brake setup. The struts required a small chamfer to allow the brake assembly to fit.

Chris True

My Feedback: (14)

Actually, what he does is stay with the 4mm pin and sleeve it out on one end with a length of brass tubing for the end that sticks in the retract. It works, the 4mm is small enough to snap on a really hard landing (hardened!!) and not damage the wing.

roalddogge

I can remember that Henke was recommending a 40mm pipe for the T35 for the best results. The pipe which comes with the mini Avanti is 45mm or so, so it is definitely not too small.

However, if you do not have the T35 yet I would recommend for sure the K45G setup. More power, much cheaper and the weight is not an issue at all. Next to that you would not have to deal with the extremely poor customer service of herr Lambert, for which in my eyes there is no place in this modern world.

jagdpantherx

I already have the t35 and quite happy with it so far. Thanks a lot for the confirmation for the size of original pipe. I will go with original pipe I think. I saw that some wooden rings are also included. I do not want to do guesswork with mounting of grumania pipe.

Small jets are more suitable for my budget and I had mw44 before. Unlike kolibri, I had diffuculties in finding a god airframe for MW44. Kolibri's size makes 90mm edf conversions easier.
Kolbri with 6 minutes of fuel is around 700-800 grams. K-45 comes close to 1.7kg including fuel. As long as I am flying with small edf conversions I will go with kolibri.
I hope, one day, Kolibri also reaches the same sales numbers as Kingtech and provides faster delıvery and better customer services.

Jgwright

Not sure where you got your figures from here. RCJI test was 198cc per min at max power. That equates to 1.188 litres for 6 mins . However you will definitely not be flying for 6 minutes at full power with the Mini Avanti! I have my K45 on a glider and I have 1.2 litres and flights are typically 10 minutes though when using a bit of thermalling it can go to 30 mins with the engine on idle. I have built plenty of planes with MW44 power and they typically used between 1 litre and 1.2 litres tanks. The consumption of the K45 is pretty much the same as the MW44.

John

F1 Rocket

Just finishing up a Mini Avanti for a customer.
MKS HV93 servos
bavarianDEMON Cortex
Jeti REX12
Kingtech K-45 turbine
Tam Jets pipe and struts
JP wheels and brakes
CM Jets 1.5L Kevlar tank
CAT 60 Air trap

LA jetguy

Danny... It looks awesome. Another excellent workmanship form the "Rocket Factory". So excited to get it soon...

Thank you and the team and the "Rocket Factory"

David

roalddogge

How do you mount the CMjets fuel tank ?

Didier

Hey Chatty,

My mini Avanti with the T50 made 4 flights yesterday!
WOW!!, what a great power!!! :-)
From take-off the mini Avanti go's directly straight up like a rocket.
Dry weight of the mini Avanti is 3300 gram (7,27 lbs) . Yes 3300 gram!! ;-)
Wet weight is 4100 gram (9,1 lbs).
I installed a 55mm double walled thrust pipe from Lambert. That saves already a lot of weight compared to the Grumania 65mm.
Looking forward for more flights.

Regards Didier

DrScoles

My Feedback: (18)

Awesome Didier, I bet it's a rocket ship with that combo. I flew my average weight K45 powered version pretty hard last week. It appears to be able to do unlimited verticals, hard to know for sure, it's so small I don't let it get that far away.

cmjets

Hello all, for fix the tank you need screw the carbon plate direct to plywood plate.



Regards from Spain
Carlos Marquez
www.cmjets.com

c_makhija

Congratulations on the maiden, with the T35 in hot conditions it has great verticals. I am sure it would be a rocket with the T50. How is the idle thrust on the 50?
I see your location as hoofddorp. Is this close to schiphol airport? I fly down to AMS pretty often.

Chatty.

emart

Managed to get a video of my 3rd flight ...

https://www.youtube.com/watch?v=bD5RA2WU3yU

Didier

Thanks!
The idle thrust is compared with the P-20 higher but on grass it was not an issue.
I fly in landing configuration also with crow, that helps to reduce the speed.
I will fly next week from tarmac and I suppose I have to shut down the turbine just before touch down as I don't have brakes.
I live near Schiphol.

Didier

Carsten Groen

Didier, how much crow do you have ? Just maidened mine with p20 and could use some extra "brakes" from our short grassstrip.

Chris True

My Feedback: (14)

Are those with gyro problems using the Cortex? I've never not been able to get a cortex to work well and it is always an improvement. Now, the cheap one by Freewing that Sebart USA was supplying at extra cost for the EDF versions (was not to be used with turbine) was a piece of garbage and went in the bin after a few flights of experimenting with every setting...

DrScoles

My Feedback: (18)

I have two jets with cortex gyros. This plane is so stable, I think a gyro is unnecessary, but thats my opinion.... ;-) I can't see one not working unless you had the gain up too high. But its such a stable little plane. I was knife edging it way lower than I'm comfortable with my other jets a few weekends ago.

Didier

Hello Carsten,
How are you? :-) I will measure it for you tomorrow but i guess about 5 mm ailerons up.
I still have to fine tune the model, as my "rest thrust" is higher then with the P20.

Regards Didier

DrV

My Feedback: (2)

I have a cortex in my Ultra Flash, BVM BobCat, and BVM Bandit MKII. Cortex makes the planes fly so much better. For some reason I can't get the cortex to work correctly on my Mini Avanti with K45. I can't figure out if the gain is too much or too little. So far I have flown the plane 9 flights and with every flight I have tried different gain configurations from 20% up to 52% in regular flight. All these configurations caused the ailerons to oscillate but not a lot. I have to admit that I had not changed the servo configuration to "digital" from it's default of "analog" within the software. I'm using Spektrum 3040 digitals on all surfaces. I have since changed the servo configuration to "digital" within the software but have not flown the plane. I'm not sure if this is the problem or the cortex is not playing nice with these servos. On all my other jets I use JR digital servos.

Tysondodd

Hi Gents, Hope this all finds you well. I have had my Mini and K45 since October last year when I came over to BITW and had a fly with Barry and a few guys at his field before the event. I actually ordered mine while I was still in the US.

I have had about 98 flights now (590min) with mine. The first 5 flights were done with the turbine conversion pipe that came with it while I waited for the Grumania Pipe to Arrive. Since then the mini has been on rails!! I have a 3e gyro in mine and has been there since the maiden. I haven't had any problems with it and I can get the settling off my TX if anyone is interested. The install isn't as neat as neat as usual as this has been used as a Jet I can leave in my truck and fit in a quick fly in between work meetings. Haven't had any problems with the retracts, just replaced the springs to help the trailing links survive the little extra weight. Came out at 3.7kg dry and I have 2 tanks with a total of 1.3L. I have to say, the 900ml tank would be sufficient as I am always landing after 6 min flight time with about a 1/3 fuel left.

Carsten Groen

Hi Didier,
all is perfect here (only misses the golfcarts and the vodka )
Thanks for the info on the crow, will try to start at 4 to 5 mm and see what happens (we only have a 70 x 70 meter grass strip locally)

Didier

Yes indeed. Golf carts and Wodka where a very good combination!

IF you fly from a short grass trip with a P-20, use Take-off flaps and large wheels! I replaced my main wheels for 2 1/4".
Also remove all unnecessary weight and keep the model as light as possible.
I just measure my crow and for the P-20 a I used indeed 5 mm of crow.
To much drag on the mini Avanti with P20 was also not a good idea, because if you chop the throttle on final, the airspeed drops very quick and can surprise you.
Now I have 9 mm of crow with the T50 to create some extra drag. (foto T50 set-up)
Hope this helps.

Regards Didier

Carsten Groen

Thanks a lot Didier, I will look for larger wheels for mine as well!
Regarding speed on final, I have my ASSI device and Android telemetry so I get the airspeed in my ear on finals (and I can even activate auto-throttle if I'm really lazy )

Didier

Ha that is great Carsten!
I'm looking forward to your flight report!