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HelicopterScale Model RC Helicopters Docs  450 Scale Lynx AH-7 My first Scale build
11-17-2016 10:58 AM  15 months agoPost 1
seaharrierman

rrApprentice

Gosport UK

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Hello Everyone

I'm Glen and this is my first venture into scale helicopters.

I am hoping to build a semi scale 450 size Lynx Ah-7 using a plastic body I bought on ebay. I will try to make it look as close to real thing as possible. I am unsure yet where not to go the hog with panels and rivets as when flying they wont be seen.

I am converting a TREX 450 Sport V2 with a CopterX 4 blade floating head that will rotate Anti Clockwise.

I have been collecting bits to assit me I really want to get the skids to be as accurate as I can and will attempt to make my own from aluminium tube and sheet.

The first thing I have done is to test fit the fuselage sections and tape them together to see how it fits.

Its balancing on pair of skids I had in a spares box.

Please feel free to ask me questions and any advice and constructive criticism is always welcome.

I should tell you all I am a novice pilot normally flying Trex 500s so any flying videos I may post wont be pretty as its very flighty compared to 500s and its taking me a while to master it lol but I'm learning hopefully not far off my bmfa A certificate

As with my 500s I will be using a Spartan Vx1e flybarless controller as I find there ease of use programming and field use with data pod is amazing

I look forward to reading your comments and will post regularly with updates

Glen

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11-17-2016 02:22 PM  15 months agoPost 2
Grimracer

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Eau Claire WI

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WELCOME.... I am looking forward to your build.

A few notes.. Be ready to drop the head speed a bit. I have build and flown a few smaller scale machines and the head speed is important.

NOTE: When you do that you ALSO drop the tail rotor speed. Be mindful of this as you learn to adjust your heli.

Grim

Michael J Zaborowski

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11-17-2016 02:26 PM  15 months agoPost 3
corywrx

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Texas

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Looking forward to seeing your build progress!

Gaui X3 Stretch - Futaba 10J - Citizen 799

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11-17-2016 05:49 PM  15 months agoPost 4
seaharrierman

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Gosport UK

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Thanks for the advice Grim. I will deff bare that in mind. I have been looking for and 11 tooth pinion to fit so I can keep motor rpm up and head speed down. Until I source one experiment with throttle curve. I already have a set slightly tail larger blades to compensate for slower head speed.

Thanks corywrx

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11-17-2016 07:05 PM  15 months agoPost 5
cobieg

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Florida

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I am curious of how the 4 blade head works out. I had a 3 blade from Copter-x I was testing to put on my 450 size AS350. On about the 10th flight, it was starting to get light on the skids when I heard a loud pop. Post accident investigation I found the phasing clamp screw was missing the head. I would suggest a stronger screw. Other than that, it flew great.
Yours is going to be a cool build. Where did you get the fuse?

I didn't crash. I just ran out of airspeed, altitude, and ideas all at the same time!

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11-18-2016 02:23 AM  15 months agoPost 6
Mojave

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Palos Verdes, Ca. USA

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Welcome to the scale family! Post up if you need any pointers with the build.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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11-18-2016 11:37 AM  15 months agoPost 7
seaharrierman

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Gosport UK

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Thanks for the info cobieg I will keep a close on it and keep you posted on the head works. Ill check my align bits see if I have spares screw same same.

Thanks barry I have a feeling I am going to need a fair few pointers

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11-18-2016 02:54 PM  15 months agoPost 8
seaharrierman

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Gosport UK

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Ok Guys I think my first step is convert the airframe to make a flying pod and boom version of the finished thing.

As the Lynx has a raised tail rotor mounted on the port (left) side of the aircraft. also blade turning clockwise up into the main rotor. To achieve this along with the fuselage I purchase a 45 degree adapter.

First job is to remove the tail assembly from the helicopter. I put the whole thing in my spares box as I have new items to use. The first job is to mark out and cut the boom to 295mm.

I made cut with a small modelling tube cutter and got a very smooth cut I deburred the cut to prevent any chance of the belt getting cut.

I fitted the angle adapter and the boom to aircraft taking care that belt twist is right to give correct rotation of tail rotor

Next step is to reverse the motor direction and remove the flybarbered head. At the same time replace the helical main gear with a standard gear. To reverse the motor is a simple matter of swapping 2 wires I swapped the red and blue

I removed the oneway bearing from the main gear case using the special tool for removing oneway bears bought from http://www.align-trex.co.uk this is a simple matter to place the tool and bearing case in a vice and closing the vice.

Its them a simple matter to turn the oneway bearing upside down and refit. them fit to the new straight main gear then reassemble with the new head.

check everything rotates in the correct directions and the autorotate works

next I routed the flexible control run similar to what used in fixed wing models

Time to set up the Spartan vx1e which I wont go into. and fit the blades before test flying

Until next time

Glen

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11-18-2016 03:49 PM  15 months agoPost 9
corywrx

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Texas

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Man that is so cool!

Gaui X3 Stretch - Futaba 10J - Citizen 799

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11-18-2016 04:25 PM  15 months agoPost 10
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Nice work on the test rig and raised tail.

Following with interest.

Steve

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11-18-2016 06:10 PM  15 months agoPost 11
Grimracer

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Eau Claire WI

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Keep rolling buddy.. looking great!

Grim

Michael J Zaborowski

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11-20-2016 01:07 PM  15 months agoPost 12
seaharrierman

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Gosport UK

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Thanks Corywrx

Yeah steve the raised tall looks great looking forward seeing how she flies

Thanks Grim watch this space.

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11-20-2016 02:26 PM  15 months agoPost 13
seaharrierman

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Gosport UK

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Firstly guys apologies for forgetting to take pics as I work. This week I have painted the main and tail rotor blades.. I carefully balanced the blades and gentle rubbed down with 600 grade wet and dry cleaned with white sprit allowed to dry. I primed the blades with Tamiya fine primer 2 coats. allowed 12 hours to fully dry. Once dried I mixed Humbrol 163 Dark Green 2 parts paint to 1 part thinners for air brushing. I painted the blades with 4 thin coats over 3 days. remember to allow to dry fully and lightly rub down with 600 grade wet and dry and clean with white spirt between coats. once the final coat was dried fully and hardened. Next step is to apply the blade markings. The finished lynx will be sophie in desert storm "operation Granby" markings I use the corgi die cast model to copy the main blade markings.

For the yellow lines I have used model technics TrimLine. The blade balance markings are 2.1mm and the blade tip is 10mm.

The tail rotor was done using red solar trim cut to a 30mm strip and carefully wrapped around the outer half of the blade. I then measured down 10mm and applied in the manner 10mm white trimline. the silver leading edge I used silver 10mm trimline cut to 50mm which needs to be folded in half before backing paper is removed. This help get in right position and prevent peeling. A did have a small peeling problem but a small dab of pva glue did the trick.

looks amazing when spinning hope the pic shows up ok

The Overall effect

It does look amazing when running. I have also manage to get some test flights in. I the air she handles beuafifully a slide slip to right when hovering to trim out. I do have have nasty groud resonance to sort when lading on concrete and shutting down. on grass or my helipad no problem just concrete and only on shut down any if anyone has any ideas as to the cause I would be very grateful to hear.

I the mean time its my helipad for take off and Landing
have a look

Watch at YouTube

I'm really looking forward to hearing your thoughts guys

Glen

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11-20-2016 07:21 PM  15 months agoPost 14
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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Looks great!! IMHO, I would only modify one item. Cut the zip tie that is closest to the tail servo. This will allow the control rod to move up/down slightly to accommodate the arc that the servo arm travels in. This will remove a lot of the friction in the tube and give you better tail control overall. It will allow the tail to come back to neutral much easier, as the servo isn't fighting the friction in the tube.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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11-20-2016 08:41 PM  15 months agoPost 15
seaharrierman

rrApprentice

Gosport UK

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Thanks barry I will do that and give it a whirl I'm flying it again tomorrow night

Glen xx

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11-20-2016 11:16 PM  15 months agoPost 16
206 pilot

rrVeteran

,Long Island,new york

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Hi I just caught up on the post, that is looking real nice, sounds nice also on the video, looking foward to seeing the fuse painted up, nice job!!.. Rich

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11-21-2016 12:02 PM  15 months agoPost 17
seaharrierman

rrApprentice

Gosport UK

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Thanks rich I started assembling fuselage today so hopefully wont be long.

Glen

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11-21-2016 12:37 PM  15 months agoPost 18
206 pilot

rrVeteran

,Long Island,new york

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Hey Glen, it's to bad they don't make that fuse in a 700 size, remember take your time with the fuse, neatness counts lol.. Rich

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11-21-2016 12:45 PM  15 months agoPost 19
CoachE

rrApprentice

Cincinnati, ohio -usa

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Looks real good.
I agree with mojave. Also keep in mind with the 4 blade head you already have a lot of torque for that tail to hold in collective climbs. When you add the weight of the fuse it will be even greater. So there for you may possibly need a bit of REVO mix to compensate.

Team JR / BD Team Pilot / Get !T - Got !T - Perfect !T

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11-21-2016 02:58 PM  15 months agoPost 20
206 pilot

rrVeteran

,Long Island,new york

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Also glen the 407 guys who are using align 600 mechanics are also using longer tail rotor blades keep that in mind... Rich

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HelicopterScale Model RC Helicopters Docs  450 Scale Lynx AH-7 My first Scale build
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