jsnipes

My Feedback: (3)

I maidened my new KC yesterday with a JC P160SX. Every start on the SX has been smooth and uneventful so far ... about 10 starts total. Very impressed with it and seems to be an excellent match to the KC. I'm going back out Sunday to log a few more flights so if anyone has any specific questions about the engine (airframe is pretty well known at this point) let me know and I'll try to get the answers on Sunday.

I'm running the new JR 1222 receiver with two A123 batteries. A123 on the ECU as well ... no issues so far and I didn't send it in for the update. I have the voltage cutoff set to 3.6V on my Orbit Pocketlader charger. Fades are less than 15 on all satellites after a 12 minute flight ... most are below 10. That gives a lot of confidence...I love having the data vs the "old days" of narrow band. I'm using a 12X and ran out of channels!! I have a smoke system and will have to Y harness or matchbox something ... rudders, flaps, etc.

Looking forward to coming down to Pensacola in a few weeks!

Jamie

bcovish

My Feedback: (8)

Jamie

Congrats on the maiden. Have a new KC in the box for 9 months now and haven't had time to start on it. Who said retirement was easy?
Are you using a regulator? How do you like the trailing link struts on the KC?
How are you turning the smoke on and off? I'm using the little switch above the left gimbal. Not sure yet if I like it there.

See ya at Pensacola

jsnipes

My Feedback: (3)

Hey Bob ... looking forward to meeting you at Pensacola. I'm not using voltage regulators ... two A123's straight into the two 1222 "powersafe" leads. Trailing link struts are good so far ... not the prettiest thing with the big spring but functional. Only thing I don't like is that when the gear is retracted the gear doors stick out further than with the normal struts ... again, no huge deal but I'm a little picky that way. I fly off a lot of grass so it'll be worth it for the functionality.

I haven't messed with my smoke yet ... plan to this weekend. I have my nose gear trim on the left trim switch so I'm not sure yet what I will use for the smoke. Maybe the left slider?? I don't want to use the right trim so I don't have to use a finger on hand on the right stick. We'll see.

You gotta give Joey a call and talk him into going to Pensacola since he's a Floridian now anyway!

Jamie

bcovish

My Feedback: (8)

Talked to Joey this afternoon. I'm working on it.

jsnipes

My Feedback: (3)

Got three more flights this afternoon ... I'm averaging 275 - 300 mah or so per start/run on 10 - 12 minute flights. I'm using 2300 mah A123's. Every start has been very smooth and the transition from low to mid to high throttle is also very smooth. A long time turbine flyer and JC owner has commented a number of times how smooth this engine is vs previous JC's. I'm really liking this the P160SX with kero start!

I'm averaging about 250 mah total (125 mah per pack) per flight on the two 2300 mah A123 receiver batteries. I've got 8611A's all the way around on flight surfaces except 8411's on flaps. JR 1222 receiver. My fades are less than 50 per flight on all receivers with most of them less than 15. Zero frame losses and holds.

Thanks Bob, Horizon, and JC for great products!

JS

jsnipes

My Feedback: (3)

Pics

jsnipes

My Feedback: (3)

The equipment, including the BVM Purple Kool-Aid! Oh yeah, it tastes so good when it touches your lips! hehehe...

bcovish

My Feedback: (8)

ALL RIGHT!!!!!!!!!!!
Congrats again.
Pensacola, here we come

Vincent

My Feedback: (61)

Jamie,
I just started running A123`s in my SM F-86 and my numbers are about the same as yours. My kero start P-80 pump pack eats up about 300mah per flight and the rx 220mah per.
V..

Square Nozzle

My Feedback: (1)

Jamie, tell me something about the starts on your 160SX. I just recieved mine last Thursday and have it on a test bench so I can play with it. The starts are beautifully smooth but I'm concerned about the momentary 1 foot orange flame that comes out during the accell to stabilized idle. Do you see the same with your engine?

Carsten Groen

John,
my P160SX does the same (as does all of my kero-start JetCat's), I was told that is normal for this type of start. As long as the flame(s) are orange you should be ok, it's first when it turns blue you're in for trouble (high temp) I was told.

It can also be that your Uaccl1 voltage is a bit too high, I have lowered mine on several engines.
There is an explanation in the manual how to set it correctly (the "drip" test)

Vincent

My Feedback: (61)

cgroen wrote: <<It can also be that your Uaccl1 >>

I believe its the Uaccel 2 that controls the ramp fuel amount??
V..

jsnipes

My Feedback: (3)

John,

No ... I am not seeing this. Maybe something to look for in the future though. I would think that tuning the fuel flow settings during startup would help out, per Cgroen and Vincent. I had a BMT 120KS a few years ago that from time to time I had to adjust the settings to prevent a flamey startup. Different technology here, but same concept. Let us know if you have any luck tuning it out. All I get now are small (1 - 3 inch long) wispy flames during ramp up that are not unlike what you might see on propane start engines during ramp up.

JS

Carsten Groen

Uaccl-1 is what feeds the motor during the startup seqeunce if I remember correctly (thats what I have changed to lower the flames during startup on kero-plugs) ?

Vincent

My Feedback: (61)

<<<<Uaccl-1 is what feeds the motor during the startup seqeunce >>>

This feeds the kero start plug and adds some more voltage to the pump if needed during the start sequence. The Uaccl-2 is the fuel ramp.
V..

Carsten Groen

You are right Vincent,
the scenario I have had was during the kero-start, I had excessive flames while the kero plug ignited (on several engines) and I was told by JC in Germany to lower the uacc-1, but guess the uaccl-2 is also interesting to look at (but I think it is used "later" in the ignition process !?) !

Square Nozzle

My Feedback: (1)

I called JetCat today and was told the very same thing that cgroen said. I will look at the Uaccl1 voltage just to see what it is. I'll let you all know so we can compare notes.

jeanfi

Hello

I have tried to decrease Uaccl1 on my Jetcat P60 and it works great. Now no more flame !!
I have posted about this suject n the Jetcat section...(P60 hot start)


Jean-Philippe

Square Nozzle

My Feedback: (1)

Thes are the limits I found in my ECU:

U-accel1 .200 volts
U-accel2 .850 volts
U-Idle .410 volts

How does that compare to everyone else and what have you reduced U-accel1 to to reduce the flaming?

Vincent

My Feedback: (61)

John,
Depending how good your fuel pump is those settings can be different on each motor. The best thing to do is to lower the setting one or two clicks at a time and try again.
V..

Square Nozzle

My Feedback: (1)

Good plan V. Depending on the weather tomorrow I'll take the engine to the flying field, clamp it to a start stand, do some starts and play with the U-accel1 settings.

Carsten Groen

John,
there is a description in the manual how to set the Uaccl-1 voltage, basically you disconnect the fuel line to the engine, then hold the line over a cup (or something similar ), then lower the voltage until the fuel just drips out of the line, but not lower than the pump starts consistently (it's all explained in the manual)

Carsten Groen

John,
a similar thread about "too hot" start on kero:
http://www.rcuniverse.com/forum/m_6971956/tm.htm

Square Nozzle

My Feedback: (1)

Thanks for the discussion gang. I got the 160 SX out to our flying field today and made several starts with it. Uaccel1 was dialed down to .175 volts and the start was what I consider normal with much reduced flame. I then went to .150 volts and saw nearly the same start characteristics. So why not!?? I went to .125 volts thinking it would have a real slow start and again a normal successful start with about the same flame level as at .175 volts. Not knowing if the low voltage at .125 volts would result in problems down the road I dialed .175 volts back in and made my final start. Result was much reduced flaming and a good start. This time I went to max throttle and held it there to burn off the remainder of the fuel in the tank. You can literally watch the fuel level drop! This engine does love fuel at full throttle. I'll be leaving Uaccel1 at .175 volts.

jsnipes

My Feedback: (3)

Great news ... thanks for the report back. I may need it in the future!

JS