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Raptor E325 › MT flight review
01-16-2009 04:59 PM  9 years agoPost 1
comet

rrVeteran

Neuilly sur Seine, Fr

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so
I got this kit at the end of the summer...
First flights occured early december, but I than tought this was just another piece of junk
Everything's stock except for align 325's, 65mg's and 401/9254 (that's the only digital I had at hand, poor me)
The thing was very twitchy and the gust and rain did'nt help so much... Motor and battery were hot too
2 flights

On a calmer day, I gave it another try; still twitchy...Anyways, building confidence, and on a fast descend, I flare it nice and soft, and woof and poof badaboom...: main blades, TRblades, boom, flybar, paddles, main axis, upper mixers, main gear, landing gear, lower frame, vertical fin and antenna
4flights

So, I got everything fixed at the beginning of the week. I also adjusted the ball on the inner hole of the servo horn and went down a pinion count, actually flying with a 12t instead of the stock 13t. I also tighten those blades bolts a little more than I usually do. I use two 10mm washers on the top of the blade to fit the main grip.
Now it's flying nice
It's still a little pitchy on flares but I believe this is due to paddle and blade lightness. (inside the paddle, there is a gap I want to fill with washers and epoxy; what's your guess on increasing paddle weight)
I get 5/6min flightime (used ABF2200 bat...) Put back 1800mA.
4 flights

VT "slow&low"

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01-16-2009 07:17 PM  9 years agoPost 2
henrik04

rrNovice

Killcare NSW Australia

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If I may suggest a simple mod to your setup: Your tail servo could be placed on the other side. As it is a right turning blades setup, you are far less prone to hit something placed on the left side than the right side.

After rebuilding so many times my E-325, I don't have anything at all protruding on the right side of the tail boom.

Happy flying.

E-325 Full metal head and carbon bits. E-620 Kasama head tail

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01-16-2009 07:32 PM  9 years agoPost 3
RaptorBee

rrApprentice

Minnesota

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I have found the MT to very stable, at least compared to a T-Rex 450. Not sure why yours would be so twitchy. What else do you fly to compare to?
Also TT makes a really inexpensive plastic blade spacer that works very well and keeps the smaller root Align blades centered in the grips.
I also agree with Henrik. The MT has a flybar seesaw that allows for a lot of angulation in the flybar. I run my tail servo on the other side for this reason, and the gyro down below (which I see you have done).

T-Rex 550E Flybar
T-Rex 450SE
E325 Mini Titan

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01-17-2009 12:13 AM  9 years agoPost 4
fenderstrat

rrProfessor

Aston,Pa

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you could try reducing the swash throws,and adding some expo,this will make it a little less twitchy,what are your swash settings/cyclic pitch?

with that tail servo is the CG right??

instead of filling the paddles with weight,maybe some flybar weights??this way its easily removeable

I flew with an 11T pinion for a long time because i was working on hovers and wanted flight time as opposed to performance,I could easily get 8-10 min of flight time on a 2100mah battery,if you want it even more tame try an 11

also,one last thing,if you want to get max life out of your batts,you shouldn't be putting back more than 1760 after a flight and thats max

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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01-17-2009 02:08 AM  9 years agoPost 5
comet

rrVeteran

Neuilly sur Seine, Fr

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that's a good idea, I might want to change side for the rudder servo... indeed, I was also surprised with that flybar throw.

spacers, ya

it's true my CG is a bit aft; this might cause the pitchyness. 20g of lead to be added in the front

it's not twitchy anymore since I changed hole on servo horn (scratch expo)

as for flybar weights, that's what I was thinking instead of risking disbalancing the paddles, thanks

Moreover, I might go 11t with 325 glass fiber blades I found here

they seem to have a larger cord than the align woodies and thus will create more lift

or those 335's: (anyone tried 335's? do they clear the TR?)

http://www.e-modelisme.com/pieces-h...s-c-26_152.html

...la suite au prochain épisode

VT "slow&low"

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01-19-2009 04:21 AM  9 years agoPost 6
comet

rrVeteran

Neuilly sur Seine, Fr

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(TT spacers and eolo paddles)

Flight review is good!
2 flights

Heavier blades on their way

VT "slow&low"

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01-21-2009 08:09 AM  9 years agoPost 7
Hazy

rrNovice

Singapore

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You sure MT is twitchy?This is one of the most stable 450 heli you can get in the market right now.

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01-22-2009 11:25 PM  9 years agoPost 8
husafreak

rrKey Veteran

Livermore, NorCal

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There are a lot of old posts about the MT having tracking issues which is what I had and it made the heli seem unstable or unable to hold a trimmed setting. Just unluck I guess. Here's how I modded mine: Metal swashplate, Metal mixing levers, metal flybar control levers, and I cut approx. 5 mm off the blade grip pitch change arms where the balls screw on. Then I put a set of CF blades (Radix) on there with those clear plastic spacers. This has been a reliable, stable and consistant setup. I think the most important thing was the upper mixing levers which came from Trex 450 parts and next cutting the blade grip arms back. My motor runs much cooler with the CF blades. The woodies are good but have a lot of drag and don't retain energy.

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01-23-2009 01:50 AM  9 years agoPost 9
fenderstrat

rrProfessor

Aston,Pa

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There are a lot of old posts about the MT having tracking issues
people tried all kinds of crazy stuff,but it was the upper mixing arms for 99%(the 1% knows who he is )that solved it,which is why you dont see many recent posts about tracking issues,for 10 bucks the problem is solved,and if you bought the SE you wont have to worry at all

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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01-23-2009 12:16 PM  9 years agoPost 10
comet

rrVeteran

Neuilly sur Seine, Fr

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so, I got those glass fiber blades in 325mm

they don't seem heavier than the align woodies but I like the leading edge and tip better They are a little rounder with 5mm thickness instead of 4 (caliper measurement)
I haven't test flown them yet though, light windstorm in Paris since yestersday...

don't get me wrong, I never had tracking issues with this one; I have set a thin layer of ca inside the bearing housings in the upper mixing arms so that the bearings have a snug fit. This is a mod I read about in this forum thanks. Too, the belt is not to tight, as it supposed to be thanks.
I have also tighten the feathering shaft bolts tight enough so that the main grips have no play at all.

furthermore, as exposed formerly,it is neither twitchy nor pitchy anymore

VT "slow&low"

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01-23-2009 03:15 PM  9 years agoPost 11
7wt

rrNovice

MIddletown, CT

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I am glad to hear that your twitchy problem went away. One thing that I would fix on your bird is the servo linkages. I would move the linkages to the outer arm on the servo horn so the linkage travels in a linear path. An angled one will give you more throw around center stick and less at the ends. By the way, my MT can hover hands of for a good five seconds indoors before it starts to drift. Even then I can just let it drift for a good while before it gets out of hand.

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01-25-2009 03:43 PM  9 years agoPost 12
comet

rrVeteran

Neuilly sur Seine, Fr

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much better with those new blades!

so I swapped the Align 325 pro woodies for those GFK325 ones. They don't have a brand, but compared to Align's, it's really day and night, and they are in the same price range...

the curves are much smoother, the pitchyness is all all gone -smooth as silk- Will probably go back to TT stock paddles, and the 13t pinion when I get fresher 2200 or 2500mA batteries

Thanks for reading

VT "slow&low"

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01-29-2009 03:44 AM  9 years agoPost 13
FlaG8r

rrElite Veteran

Florida

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Great write up/ build review here...
http://www.rcuniverse.com/magazine/...?article_id=932

Life is tough, it's tougher if you're stupid

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03-09-2009 12:11 PM  9 years agoPost 14
comet

rrVeteran

Neuilly sur Seine, Fr

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I again flew the 325 yesteday and it was smooth. Haven't changed a thing in the setup yet, not a real powerhouse, but very smooth and silent flying.
50 flights so far and very pleased with that little machine
Full stock E325 with 12t pinion, 85mg's, 401/9254, ABF3S2200mA, 325mmGFKBlades,FM Rx/Tx
And NO CRASH

VT "slow&low"

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03-09-2009 03:25 PM  9 years agoPost 15
Psynapse

rrNovice

Van Isle - BC - Canada

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Comet:

What is that on the front of your battery tab? Could only be rubber or lead

Why I'm wondering is I have my battery slid back about 1/2 an inch farther than yours to get the center of gravity right. With my batts slid that far forward my heli hangs nose low when hung from the head button.

Mini Titan E325 SUB-SE
...and enough parts to build it twice over again.
(I plan on crashing)

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03-09-2009 07:45 PM  9 years agoPost 16
comet

rrVeteran

Neuilly sur Seine, Fr

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Yes that's lead (20grams) in the front, held with double sidded tape to achieve CG with 9254 as tail servo

VT "slow&low"

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03-16-2009 09:42 PM  9 years agoPost 17
comet

rrVeteran

Neuilly sur Seine, Fr

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bb

VT "slow&low"

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03-17-2009 01:33 AM  9 years agoPost 18
7wt

rrNovice

MIddletown, CT

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That doesn't look twitchy at all. Nice flight!

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03-17-2009 01:47 AM  9 years agoPost 19
comet

rrVeteran

Neuilly sur Seine, Fr

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7wt
thanks for following the review
it's all good since i swapped align woodies for local GFK325mm
i want to try Sab's carbon on this one later
thanks again

VT "slow&low"

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03-19-2009 02:18 PM  9 years agoPost 20
torenhg

rrApprentice

Orange County, SoCal

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I second the motion, great flight looks like to handled well and while it is hard to tell on video during flight, it looked like on takeoff and landing that there was not any real twitching.

Kinda makes me want an electric

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