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Jan 22, 2021, 11:25 AM
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fenderbean's Avatar
flow through I would think is more important than size because, if the UAT cannot pull fuel from the tanks faster than its using then your UAT will eventually go below the pick up level and you will flame out. Cavitation is similar in this regard, pressure difference and what not.
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Jan 22, 2021, 11:26 AM
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fenderbean's Avatar
Quote:
Originally Posted by T-CAT
With this X90, would a standard (not the High Flow) 4oz MAP Air Trap be sufficient? Im just planning the next stage of orders for supplies.
Yes it would
Jan 22, 2021, 12:49 PM
Instagram: @tcat.rc.creations
T-CAT's Avatar
Thanks guys. I appreciate it .

I was looking around reading various articles last night to see what additional information I could find and came upon a good one from Ultimate Jets. The article is linked below:
https://ultimate-jets.eu/blogs/fuel-...ing-cavitation

A quote from part of his article was:

“So as good as the older system are, they only offer a few seconds of maximum thrust fuel flow buffer. However, for hard core aerobatics flyers and people who like to fly at full thrust for a large portion of the flight and keep high thrust level in the dive, the amount of air that is sucked by the clunk can be up to 15 seconds of full thrust fuel flow!

For this reason I strongly recommend choosing and air trap that offers 30 seconds of full thrust fuel flow buffer capacity.”


So, if I’m doing the math correctly with the engine fuel flow specs listed on Xicoy’s website for the X90, X45, and X120, then:

1. X90 fuel flow @max throttle = ~270g per minute
270g = ~9.1oz per min
9.1oz/2 = 4.55oz Air Trap to obtain the 30 second recommendation

2. X45 fuel flow @max throttle = ~145g per minute
145g = ~4.9oz per min
4.9oz/2 = 2.45oz Air Trap to obtain the 30 second recommendation

3. X120 fuel flow @max throttle = ~350g per minute
350g= ~11.8oz per min
11.8oz/2 = 5.9oz Air Trap to obtain the 30 second recommendation

I’m comfortable rounding the numbers, and using a 4oz MAP Air Trap for the X90 and 2oz MAP Air Trap for the X45 . That should provide roughly 25 seconds of full thrust fuel flow buffer capacity if I calculated correctly .
Last edited by T-CAT; Jan 22, 2021 at 05:19 PM.
Jan 22, 2021, 06:08 PM
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fenderbean's Avatar
Like I said the above is all about fuel flow and its ability to flow through under various settings, so naturally it would make sense to go with a margin for error at fuel throttle. Cheers
Jan 22, 2021, 06:09 PM
Instagram: @tcat.rc.creations
T-CAT's Avatar
Quote:
Originally Posted by fenderbean
Like I said the above is all about fuel flow and its ability to flow through under various settings, so naturally it would make sense to go with a margin for error at fuel throttle. Cheers
Makes sense for sure.
Feb 14, 2021, 09:21 PM
Instagram: @tcat.rc.creations
T-CAT's Avatar
Keith,

Does the X90 have the exact same pump, manual shut off valve, and filter that the X45 has?
Feb 14, 2021, 11:20 PM
ah dinnae ken
jimbo12's Avatar
The pump is different. It has more flow.
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Feb 14, 2021, 11:27 PM
Instagram: @tcat.rc.creations
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Quote:
Originally Posted by jimbo12
The pump is different. It has more flow.
I had a feeling that was the case, but wasnt sure until confirmed. Thanks Jim .
Feb 15, 2021, 09:22 AM
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fenderbean's Avatar
Quote:
Originally Posted by T-CAT
Keith,

Does the X90 have the exact same pump, manual shut off valve, and filter that the X45 has?
No its substantially larger than the X45 pump. If I was a betting man the same will be used on the larger Xicoy motors to come as well.
Same for the X90 & X120
Feb 15, 2021, 10:03 AM
Instagram: @tcat.rc.creations
T-CAT's Avatar
Quote:
Originally Posted by fenderbean
No its substantially larger than the X45 pump. If I was a betting man the same will be used on the larger Xicoy motors to come as well.
Same for the X90 & X120
Excellent, thanks Keith.
Feb 26, 2021, 03:56 AM
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Mar 24, 2021, 06:14 PM
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Thread OP
Xicoy X90 whats in the box (11 min 30 sec)
Mar 24, 2021, 06:15 PM
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Thread OP
Xicoy X90 ECU walkthtough (15 min 15 sec)


Xicoy X90 first start (5 min 24 sec)
Oct 17, 2021, 06:15 AM
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Any one already flying the X90? Real time feedback would be nice. Specifically if someone flying these in hot temperatures.

Regards
Chatty
Oct 19, 2021, 04:09 PM
Peter S.
HPS52's Avatar
Quote:
Originally Posted by c_makhija
Any one already flying the X90? Real time feedback would be nice. Specifically if someone flying these in hot temperatures.
Hi Chatty,
until now I had 30 starts with my Viper / X90. Partially over 30 celsius in summer. The Xicoy X90 works perfect. I can absolutely recommend!
Regards Peter

C&C Model "Viper Jet" powered by Xicoy "X90" (4 min 58 sec)


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