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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › Just a few questions + my Whiplash build...now...the maiden!
03-04-2013 10:29 AM  5 years agoPost 41
rcnut

rrElite Veteran

Rockford, Illinois

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My maiden flight
For the first flight of the day, I decided to try out my Compass 3D+ (new clutch, clutch bell, and motor mount). It took a couple of minutes to get the motor to run in the cold, it is extremely cold blooded. However, I managed to get it warmed up enough to obtain rpm on the rotor head. My 3D+ lifted off the ground as if it was summer time. Went into idle up 1 and let it rip up the sky, boy was that ever fun!

Its been a long time getting out to fly, my skills were a bit rusty, but after a few minutes, everything started coming back. Bob and I decided to take a break and warm up a bit before trying out the Whiplash. I filled the tank before Bob arrived, so everything was ready. I turned on the radio, then the heli, primed the bulb on the carb, and proceeded to start the motor with my electric starter I use for my nitro helis.

However, my starter wouldn't even turn the motor over...Hhmm. Ok, I'll use the pull start. I could feel the motor was somewhat hard to turn over due to no fuel in the motor...yet as the fuel entered, I could feel the pull starter getting easier to pull. So I decided to use the electric starter, but it still wouldn't turn it over. Ok...no problem, I'll just start my heli with the pull start!

1...2...3...4 pulls, then it started! The motor idled nicely and was ready to go, unlike most nitro motors. Throttled up slowly and as the head speed started spooling up, the tail servo was reversed...oh boy! I thought I checked everything, missed that! No problem, throttled down and reversed the rudder servo in the radio. This time my Whiplash was ready for its maiden flight. I advanced the throttle and it lifted off the ground! Nice and smooth, no trim was needed.

The tail seemed to be a bit twitchy, so I lowered the gyro gain, but only to realize it was from the motor. During the break-in process, the instructions call for the motor to be rich. So that is causing the tail twitching. It will go away as it is breaking in, or in several more tanks of fuel.

I turned the heli to the right and pushed the cyclic stick forward and away it went. Nice and smooth, nothing too fast or too much collective. I flew my Whiplash several times around the field, then brought it in for a landing. Two minutes out flying around, and then one minute sitting on the ground idling. Did this routine a couple of times, then checked my fuel tank, just enough for a couple of minutes more.

Well I should of stayed on the ground, right at the 2 minute mark and right in the middle of a turn, the motor decided it was out of gas! The motor stop very suddenly, so I finished the turn quickly and started an auto. I was out a ways over the snow, and didn't want to land in it! So I "milked" the auto for about 70 feet at half the needed head speed...I would have to guess I'm around 1500 rpm's! Not quite enough, and I was right. I came in for a medium bounce and a roll over with a small slide to a stop!

Broke two servo horns, slightly bent one of the blade linkages, scratched my new muffler and canopy, and scratched some of the landing gear. All and all, it was a good flight. I can't wait to get back out and try it again! Bob said the weather for next weekend is forecasted for the 40's & 50's!!! Oh yea, I'll be ready!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
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03-04-2013 02:54 PM  5 years agoPost 42
fastflyer20

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N. Tonawanda, NY

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Sorry to hear about the mishap at the end, but glad everything else went well.

Once it is broken in, it should start fine with a decent 90 size starter.

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03-04-2013 03:27 PM  5 years agoPost 43
rcnut

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Rockford, Illinois

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Cool about the starter, however, I'm ok with the pull start...it pulls very easy, and after running for a short time, one pull to start! Way Cool!

One thing I'm concerned about...the first tank only lasted roughly 10 minutes. I thought it would have lasted longer.

I did notice at the beginning, the motor smoked like a nitro, but slowly quit by the end of the tank. I have a small (very small) amount of oil residue on the boom support right by the end of the muffler.

I might have the needle setting too rich...low set to a little over 1-3/8 turns, and high set to a little over 1-1/2 turns out. Based on everything I've been reading and the manufacture break-in instructions...it states to keep the motor rich!

So for the second tank, sould I lean both needles a 1/16 turn?

Thanks!

It was a lot of fun flying my Whiplash...can't wait to do it again!

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"I love the smell of Nitro in the morning!"
...Citizen 654!

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03-04-2013 04:00 PM  5 years agoPost 44
fastflyer20

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N. Tonawanda, NY

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Leave it there for the first few tanks unless it can't get up to head speed, then adjust in so it can spool up.

Once broken in and the carb is adjusted properly, you will consume approximately 1 oz per minute, so the Whiplash will fly for around 15 minutes on a tank.

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03-04-2013 06:54 PM  5 years agoPost 45
rcnut

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Rockford, Illinois

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Ok, because I'm getting around 10 minutes right now. I'll leave it alone. I'll fly several more tanks, then start adjusting the needles...slowly!

Thanks!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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03-04-2013 07:31 PM  5 years agoPost 46
Toadster25

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Iowa

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Something you can try if you want to use the electric start is to turn the engine over by hand just past the top dead center. That way your starter has almost one revolution to get the motor turning. I do this when pull staring all the time.
You probably already know this but thought I'd mention it just in case

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03-06-2013 01:47 PM  5 years agoPost 47
rcnut

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Rockford, Illinois

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...turn the engine ever by hand just past the top dead center...
Yea...I used to do that with some of my nitro motors. It sucked until the motor was broken-in.

My Whippy has been repaired and ready for some more flying! Tomorrow is forcasted for sunny along with a few clouds. High 34F. Winds light and variable. So I might sneek out after work and get a couple of flights in!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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03-13-2013 01:19 PM  5 years agoPost 48
lsnover

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Lehigh Valley, PA

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I helped a new friend with a Whiplash gasser maiden this weekend. The pull start is sweet.

What are you guys running for throttle and pitch curves?

We had a lot of motor vibration which caused a lot of tail wag. Once it's up in a good RPM range it smooths out, but I'm not familiar with running gassers on helis, so I didn't want to push the RPMs too much.

When it's up in the sweet part of the RPM curve, it flies very responsively. I was really surprised.

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03-13-2013 03:05 PM  5 years agoPost 49
Nycatt

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New York

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lsnover
If your Lee's friend I just replied with this info in a PM on the other site.

Also, the throttle setup is different from a nitro throttle setup.

THIS IS FROM THE OTHER SITE.

I set my arm on my servo so that at full closed throttle it is pointing nearly straight down the linkage and a full throttle it is pointing just past 90 degrees. Then I set the arm on the carb so that at full closed it is at nearly 90 degrees and at full open it is pointing almost straight down the linkage.

This way at near closed position the servo has to rotate quite a bit to get little rotation from the arm on the carb. At near full throttle the servo only rotates a little to get a lot of rotation from the arm on the carb.

This setup really make the gasser act a bunch more like a glow machine as far as throttle curves go.

Have fun, I really like this setup.
Malorie
1700 rpms for Breakin, any lower and she wobbles until dampners are broken in.

My Normal Curve is 0, 30, 35, 49, 76
Idle 1 & 2 is 76, 49, 35, 49, 76




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03-16-2013 02:17 PM  5 years agoPost 50
rcnut

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Rockford, Illinois

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Per a conversation with Carey Shurley about this throttle setup;
the idea behind this is to increase throttle response by using a mechanical multiplier. small servo movements especially around mid stick result in large throttle movements.

the motors aren't as powerful so the idea was to lead the throttle quicker

personally I don't use this setup and never have. Servos now are very fast and this originated from a time when the running configuration of gas helicopters was very different.

Originally the idea was to keep the engine rpm very low to reduce vibrations so the throttle was barely open most of the time. Any pitch change needed a lot of throttle so this was a way to get it

but now, both head and engine RPMs are much higher so the throttle is more open all the time.
I don't have mine setup this way...instead I set mine up linear.

Still running rich on my TRM270TT motor (12 flights total now, at 10 mins per flight = 2 hours of run time), I started with 0,23,34,47,100 in normal mode, then changed it to 0,27,45,57,100 and turned both needles 1/16" turns in. Basically just "cracked" the needles lean. My idle 1 is 100,54,42,54,100. My Whiplash is running smooth for the most part.

I too have a tail wag due to the motor detonation...being rich. I'm running a head speed of 1700-1800 rpm. On the last two flights, the motor dropped in rpm...getting richer...so I need to "crack" the needles lean again. Each time I do this, my flight time increases some.

Hope this helps!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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03-16-2013 02:56 PM  5 years agoPost 51
Nycatt

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New York

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Thanks for that rcnut. I might change it to see if I see a difference.




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