Independent tests prove lack of frequency hopping with XPS

[jonkoppisch]

That's the old Fat Albert, right behind the museum!!!

Sorry to hear about that! I've been constantly flying in the 90's with no problems.... I do think that futaba needs to look and see what's going on!

[USN_POPS]

	Quote: Originally Posted by Kal
	Which fasst receier is this? I use the 7 channel in my bocat and have flown that in 114 degree (in the shade) heat without a problem. I don't leave the plane in the sun tho.

It was the 607 FS that came with the module for my 9C.

I figure it was a combination of small plane, batteries running warmer in the heat, more warming from the speed controller and to some extent a lack of cooling air travelling through the fuse. But I won't be flying again when it is hot, too big a risk.

[gregw]

	Quote: Originally Posted by USN_POPS
	It was the 607 FS that came with the module for my 9C. I figure it was a combination of small plane, batteries running warmer in the heat, more warming from the speed controller and to some extent a lack of cooling air travelling through the fuse. But I won't be flying again when it is hot, too big a risk.

I think you really need to add air vents to the fuse to circulate air around the Rx if you're getting heat related problems on FASST at only 90+ degree temps...

[Tin man]

Yea 90's F is nothing. I was test-running a DA 150 the other day with the canopy off of my 40% comparf. It was 110 F at the time and I was barely able to handle it.

Anyhoo, the 6014 was exposed to direct, intense, sunlight for 2 hours--most of that time with the engine off. Not even a hiccup.

That said I will be shading the receiver in plane with a small piece of white-covered balsa so it stays shaded when the canopy is off.

I did, however, lose a plane with a 607 in it. Plane went outta control, with jerky uncommanded manuevers. Was ready to blame FASST but after-crash analysis showed a faulty Equalizer II as the most likely culprit. Even so, I can't bring myself to run a 607 again. (I do have 200+ flights on 617s without issue.)


Keep in mind I live in one of the hottest places in the USA: Lake Havasu City, AZ.


EDIT: Posting this from my iPhone not realizing it wasn't really a FASST thread (wonder how THAT happened). Sorry 'bout the off-topic post.
--
Mike

[jonkoppisch]

Shoot!!! I was wrong! I apologize!! After playing with the xps for awhile this morning using special circumstances & my new remote, portable telemetry unit, I was able to make it hop A slow rise in interference made a BIG difference...

Anyway, here's the vid...

[Wojcigitty]

	Quote: Originally Posted by jonkoppisch
	Shoot!!! I was wrong! I apologize!! After playing with the xps for awhile this morning using special circumstances & my new remote, portable telemetry unit, I was able to make it hop A slow rise in interference made a BIG difference... Anyway, here's the vid...

I think you deserve an award for the best "stupid XPS hopping" video.

[Julez]

	Quote: Originally Posted by USN_POPS
	It was the 607 FS that came with the module for my 9C. I figure it was a combination of small plane, batteries running warmer in the heat, more warming from the speed controller and to some extent a lack of cooling air travelling through the fuse. But I won't be flying again when it is hot, too big a risk.

The risk of not having a cooling airflow through the fuselage is bigger than the risk of ambient temperature.
You are exposing your ESC, the battery pack and the engine to unnecessary high heat levels, too.
A cooling airflow through the fuselage is a MUST for every electric plane.

Here is some information about cooling:
http://www.rcgroups.com/forums/showthread.php?t=257604

I recently made nice NACA inlets for my robbe Arcus, and this helped to cool the ESC considerably.

[jonkoppisch]

	Quote: Originally Posted by Wojcigitty
	I think you deserve an award for the best "stupid XPS hopping" video.

Since the guys with telemetry etc seem to be having a hard time documenting the hop I thought I'd help them out...

[Gordito Volador]

Jon,

I happen to appreciate your hopping video. Thanks for a job well done.

Regards, Bill

[jonkoppisch]

lucky for the frog, I didn't have a snake handy or the interference might very well have won

[Woketman]

	Quote: Originally Posted by jonkoppisch
	Shoot!!! I was wrong! I apologize!! After playing with the xps for awhile this morning using special circumstances & my new remote, portable telemetry unit, I was able to make it hop A slow rise in interference made a BIG difference... Anyway, here's the vid...

AWESOME video Jon. IT HOPS!!!!

[USN_POPS]

	Quote: Originally Posted by Julez
	The risk of not having a cooling airflow through the fuselage is bigger than the risk of ambient temperature. You are exposing your ESC, the battery pack and the engine to unnecessary high heat levels, too. A cooling airflow through the fuselage is a MUST for every electric plane. Here is some information about cooling: http://www.rcgroups.com/forums/showthread.php?t=257604 I recently made nice NACA inlets for my robbe Arcus, and this helped to cool the ESC considerably.

There are cooling ducts built into the Diamante, and they are adequate for normal temps. I have about 50 flights on the plane in the cooler weather here in western Washington. Everything comes down cool, batteries, ESC and motor are barely warm after a 8-10 minute flight.

This was an exceptionally hot afternoon, and probably it got very hot inside the fuse. I'm going to run some temp checks on the plane sitting in the sun, and see if the RX does get hot if i let it sit in the sun. About the only way to test it here in the 70-75 degree weather we are having.

I do plan on adding some intakes during the repair process however just to be sure.

[jonkoppisch]

More on the frog.

To make it up to the frog I bought him a cigar and brought in a couple of female frogs for the afternoon and played a video of the muppets for them to watch After that, i put him out on the back porch and the last i saw of him he was heading off in the Orlando Florida direction leaving a smoke trail

If you would like to join the list of frog sympathizers you can go to http://www.rcgroups.com/forums/showt...0#post10329392 and post your outcry for the mistreatment of the poor froggy

disclaimer: No frogs were hurt or poked in the making of this video

[Dustflyer]

	Quote: Originally Posted by Wojcigitty
	I think you deserve an award for the best "stupid XPS hopping" video.

He deserves a reward for keeping a sense of humor in spite of losing a jet because of a radio system that failed to perform as advertised. XPS has proven itself to be grossly inadequate as a remote control system.

Want to talk about stupid? I saw an incredibly idiotic comment on another forum about how XPS is a fixed channel system just like Spektrum, as if that made it just as good as Spektrum. That is precisely the problem with it and why Spektrum uses two channels and two receivers, because that works and what XPS does doesn't.

I use Spektrum because it works best. It is the only system designed from scratch specifically for RC. I've talked to people at Spektrum familiar with the design phase. They looked at frequency hopping schemes and rejected the idea. They found the dual channel dual receiver system just works better. I have also talked with high level jet flyers and turbine people involved in early flight testing and evaluation; same conclusion, Spektrum works better than any other scheme.

XPS, in spite of what they advertise or claim, apparently operates on a single frequency with a single antenna. Ever notice that all wireless microphone and guitar systems are dual channel, dual antenna true diversity systems? Even that stuff uses two channels, not single channel or frequency hopping.

WARNING:

If you fly an RC airplane with XPS there is a very high probability it will crash due to the inadequacies of the radio control system.

[Wojcigitty]

Dustflyer,

Chill out dude. I meant that it was the funniest of the stupid XPS hopping videos. Better than this one:

YouTube - XPS Hop Video

I didn't mean that his attitude was stupid or that mocking XPS is stupid. He's got every right to be mad, I've been burned by bad products in the past too.