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Thunder Tiger Electric Helis Mini Titan E325, Raptor E550 and E620 SE Helicopters |
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09-05-2011, 07:49 PM | #181 (permalink) |
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Just getting the kit. My 400 needs a complete tear down and rebuild with near bearings, swash, etc. I am going to move my electronics over to the MT since they were all upgraded and rebuild it over the winter. Can't wait for the MT to show up.
Sent from my GT-I5510M using Tapatalk
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B400(retired),Mini Titan V1(Retired),Radikal G20 (scrapped),Align T-Rex 500pro DFC,Synergy E5s |
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09-17-2011, 08:22 AM | #182 (permalink) |
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Almost crashed yesterday - twice! I was practicing some inverted loops and did a dumb thumbs. I ended up saving her about 10 feet above the ground. Did a similar maneuver with the B400 - I think I ended up cutting some of the tall grass! Both helis survived to fly another day. Think I'll be practicing those on the sim for a while ...
Up to now I had been running both gyros (Futaba GY401) in standard or analog mode. Hitec 5084 tail servos on both. Yesterday I switched them both into digital mode - didn't notice much difference in normal upright forward flight. I did notice some improvement in holding of the tail during flips, loops and rolls though -John |
09-18-2011, 12:19 PM | #183 (permalink) |
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John, It's not a good idea to change from analog to digital on the 401 just to try it. If you're using an analog tail servo, use analog. If digital tail servo, use digital.
From the GY401 manual: •DS switch setting precaution When the DS switch is set to the ON position, the rudder servo is driven by approximately 270Hz high-speed pulses. This mode is for use with Futaba digital servos only. ***When using servos that are not compatible with high-speed pulse drive, other than digital servos, never set the DS switch to ON. The servo may be destroyed.
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Diabolo 700UL / Logo 700 / Oxy 5 / Goblin 500 / Oxy 2 FE / Blade 180CFX / mCPxBL / nano CPS / V-Bar NEO / V-Bar Control / uBrain / DX7
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09-18-2011, 01:10 PM | #184 (permalink) |
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Thanks Dave. Yea, that's what I read too. Guys on the B400 forum were puzzled as to why I was running the GY401 with Hitec's 5084 (digital tail servo) in non-digital mode. To be honest, I forgot, until now ...
Looks like there's an intentional gray area surrounding the compatibility of Hitec digital servos and Futaba gyros operating in digital mode. From Hitec: Pulse Data All Hitec servos require 3-5V peak-to-peak square wave pulse. Pulse duration is from 0.9ms to 2.1ms with 1.5ms as center. The pulse refreshes at 50Hz (20ms). It's that last sentence that's interesting - it doesn't say the servos require a 50Hz pulse as a maximum, it just generically describes the standard pulse rate. It stops just short of saying it's a requirement. Then, from the specs of the 5084 from Hitec: HSG-5084MG Micro Heli Tail Rotor Servo The “extreme speed” HSG-5084MG Digital Micro Tail Rotor servo is based off the HSG-5083MG but utilizes a standard frame rate digital amplifier. Designed to work with most gyros the HSG-5084MG is designed to obtain optimum performance in the T-Rex 400-450, Helimax 400-450 or similar class of electric helis. So they also stop short of saying the servo is compatible with other gyros in digital mode. And they're playing games with the words "standard frame rate digital amplifier" by not really describing it's electrical requirements in minimum/maximum/typical format. And, the last paragraph from Futaba adds to the gray-ness: ***When using servos that are not compatible with high-speed pulse drive, other than digital servos, never set the DS switch to ON. So does this mean that all digital servos are in fact compatible with DS mode ? E-Flite has some "digital" servos that don't work with other "digital" components, so is "digital" a loose term without any real definition as far as servo/gyro/tail servo pulse rates are concerned? This is why I was running them in non-digital mode - I had forgotten until you mentioned this. Too much BS going on. I'm switching back. So, standard analog pulse rates are 50Hz (?) What are standard digital pulse rates ? Or is this where the marketing guys get involved and the answers depend on who you ask ... ? Are all vendors "standard" digital pulse rates unique, just like 2.4G protocols? Apologies - I remember this causing frustration earlier this year when I couldn't get solid answers ... Thanks for pointing this out Dave ! -John |
09-18-2011, 09:48 PM | #185 (permalink) |
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Yep, it's the fine print that always get's ya.
I don't have any experience with Hitec servos. With my JR and Futaba servos, I don't buy any that are NOT digital. IMHO, if your servo says "Digital" on the case, I'd just use digital mode on the gyro. Might want to send your question to a Hitec service technician just to verify.
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Diabolo 700UL / Logo 700 / Oxy 5 / Goblin 500 / Oxy 2 FE / Blade 180CFX / mCPxBL / nano CPS / V-Bar NEO / V-Bar Control / uBrain / DX7
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09-24-2011, 08:22 AM | #186 (permalink) |
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[ame]http://www.youtube.com/watch?v=58BsG7BeuBA[/ame]
A short collection of close ups from this summer's inverted practices with the Mini-Titan, the Blade 400, and the Blade 400 dressed up like a Mini-Titan Oh yea, Happy Fall ... -John |
09-24-2011, 11:03 AM | #187 (permalink) |
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I am glad there were others here that fly the B400 as I gave them all the parts not worn out from my old one. The mini titan i am loving, Put it through some wind last night. Not used to a heli moving into the wind instead of away.
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MT, DX6i, Hs65HB, Spartan Quark, Align DS410, Scorpion 2221-8, CC IceLite 50. |
09-25-2011, 02:04 PM | #188 (permalink) | |
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Quote:
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09-25-2011, 02:54 PM | #189 (permalink) |
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Yes, both helis have their stock plastic heads. Headspeeds are around 2600-2800 for both helis. $6.70 carbon fiber blades on both as well - those really made a difference
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10-05-2011, 10:00 PM | #190 (permalink) |
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Got a few after-work flights in today - some great weather for a change
Took her much higher - couldn't see her all that well though ... need a bigger heli |
10-05-2011, 11:23 PM | #191 (permalink) |
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Those photos are very very cool!
Looks like you would indeed have had trouble seeing it - how high do you think you were BTW?
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Thunder Tiger Mini-Titan V1 Futaba 2.4G 7C, Futaba S3153 cyclics Futaba GY401 + S9257 Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC |
10-06-2011, 04:58 PM | #192 (permalink) |
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Thanks! I'm guessing somewhere around 100 feet. The buildings are around 30 feet tall and the trees in the forest seem to be around 30-40 feet as well. Hard to tell for sure - some telemetry devices would be sweet ...
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10-06-2011, 08:04 PM | #193 (permalink) |
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Does the heli feel quite stable at that height? Or does it take quite a lot of thumb work to keep it steady?
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Thunder Tiger Mini-Titan V1 Futaba 2.4G 7C, Futaba S3153 cyclics Futaba GY401 + S9257 Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC |
10-06-2011, 08:37 PM | #194 (permalink) |
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It's nuts up there! Even with the bright pontoons it's hard to tell if the heli is rolling (which is very much evident in the video I shot up there). It's not as bad when you're moving forward, for example, but when you want to stop, hover and do a slow piro it turns out pretty bouncy, even though from the ground it looks like it went great.
I think 1) a larger heli, and 2) a 3-axis stabilization system set to keep the heli from rolling/pitching (unintended movement only) would help for better video shots. I took her higher today and she turned into a tiny white spec and I didn't like that at all. And, of course, the camera stopped working about a minute into that flight so I didn't even get the money shot -John This is a flight from the previous day: [ame]http://www.youtube.com/watch?v=skBEhtfc0Gw[/ame] Last edited by FR4-Pilot; 10-09-2011 at 12:01 AM.. |
10-22-2011, 02:08 PM | #195 (permalink) |
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Another fan of the Green flybar paddles
Yea, those green flybar paddles are nice, really nice I changed nothing else on the heli, just the paddles. The green ones weigh about 4.4g each while the stock white ones are closer to 7g each. Even with the slower HS-55 servos the roll and pitch rates were very impressive Although the pitch rates were a little quicker than the roll for some reason - exact same setting in the swash mix ... ?
It was really windy so I only got to test flipping, rolling, loops, etc. Still have to see how slower, more accurate flying is with these guys. And they're like $3.75 for the set - even better! -John |
10-22-2011, 02:15 PM | #196 (permalink) | |
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Green paddles are magic!
They do not change stability of heli and increase filp and roll rates significantly! Quote:
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10-22-2011, 02:20 PM | #197 (permalink) |
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Amazing - I can't wait to check that out ...
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10-23-2011, 05:20 AM | #198 (permalink) |
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I have used the kbdd paddles and found them too fast and I returned back to the white stock paddles. I also have the green paddles but I hear that they are just as fast as the kbdd Paddles that is why I haven't bothered putting them on
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10-23-2011, 06:29 PM | #199 (permalink) |
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That's cool. Do you happen to know how much those KBDD paddles weigh? Just curious ...
-John |
10-24-2011, 02:59 PM | #200 (permalink) | |
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