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HelicopterScale Model RC Helicopters Docs  450 Scale Lynx AH-7 My first Scale build
07-02-2017 12:55 AM  86 days agoPost 141
206 pilot

rrVeteran

,Long Island,new york

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Nice have fun... Rich

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07-06-2017 08:32 PM  81 days agoPost 142
seaharrierman

rrApprentice

Gosport UK

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Well Guys Monday night I had a servo fail so I replaced them all with the latest Align ds450 servos and set up as normal while I had the mechanics out I decided to move the flybarless controller to make more accessible. I reassembled the aircraft and test hovered in garden prior to flying at club this evening.

IMG_0934 by Glen Davis, on Flickr

Everything seemed to perfectly in garden.

At club this I went to fly outside as was a nice evening light winds nice flying conditions. The flight was going perfectly with me getting used to handling her and gently flying around. Time to land everything went lovely gentle touch down throttle hold engaged. Seconds after switching motor off disaster struck. She went into a horrendous resonance. The resonance caused forward fuselage to detach and a blade strike on the boom.

IMG_0935 by Glen Davis, on Flickr

IMG_0936 by Glen Davis, on Flickr

IMG_0937 by Glen Davis, on Flickr

On detailed inspection at home the damage is repairable and I'm intending to have rebuilt for helipad later this month. Thing that's really worrying me is what caused the resonance. I'm wondering if it was the moving the controller or something else.

I would be interested to hear your thoerires guys

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07-06-2017 09:11 PM  81 days agoPost 143
v22chap

rrKey Veteran

Granger, Indiana

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#1 on my thought list would be do you have negative pitch in your landing stunt switch mode ? If you do then the going from positive to negative on the ground can start this destroying resonance .
This one wouldn't usually let you get to the point of shutting the motor down before it would strike .

#2 do you have upper body attachment points ? If the upper fuse is not attached some how or atleast got a foam filler pad out to the fuse somewhere ,, it can also cause this .

Sounds more likely that you had this latter one happen .. canopy started to vibrate , came off and into blades and that caused one blade to retreat enough to hit the tail boom when it came around.
Sorry to hear about this disaster you had ...but glad you are willing and able to repair it .

Larry C ----------Bergen R/C helicopters

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07-07-2017 04:41 PM  80 days agoPost 144
seaharrierman

rrApprentice

Gosport UK

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Thanks Larry

No I always shut down at 0 degrees and let it spool down naturally.

I don't have upper body bracing but will have on rebuild as your read I found the cause.

Had some time this afternoon to have a dam good look at the aircraft. Good news all the damage is repairable and will be done over weekend. I also spent several hours trying to find the cause of vibration. I had to change a damaged blade and checked the tightness in all the blade grip all seemed fine but I did notice one of the blade grips seemed to have a bit more play than the others. on investigation I found the bolt that attaches the feathering shaft had come loose.

you can the offender inside of the hub
IMG_0938 by Glen Davis, on Flickr

I Tighten this bolt and checked the other three. Once all check tighten I powered up and very hesitantly increased collective the mid stick so far so good checked the controls and increased collective to light on skid still good and gently lifted into the air and climb to 3 feet allowed to settle in a nice hove and then carefully descended to a gentle touch down, collective at mid stick no sign of any vibration throttle hold on and as spooling down to 0 collective still steady as a rock. power down and check everything again still good. I then did a series of 10 take off, landing and shut downs. landing gently and on 3 more hard no evidence of vibration.

Conclusion: A bolt can come loose at anytime so beware I now have a procedure to prevent this happening again. which involve climbing up of the ground 2-3 inches then engaging throttle to auto back down avoiding the resonance frequency

Remove all 4 bolts and replace tighten with fresh red Loctite include a physical tightness check as part of first flight pre flight checks and after flight checks

Thanks for all your suggestions and help guys I will making some modifications on rebuild

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07-07-2017 10:15 PM  80 days agoPost 145
seaharrierman

rrApprentice

Gosport UK

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Now I have solved the vibration issue its on with the repairs as I determined to the have ready for helipad scale fly in near fort nelson on the 23rd

I started with the forward fuselage. Damage sustain a large crack port side top to 3/4 way down wood frame broken and large chips in paint.

firstly I taped the cracked to hold it together

IMG_0939 by Glen Davis, on Flickr

As the fuselage is plastic I painted over the crack from the inside with plastic weld to hold crack nicely together. Once set I used 0.25mm plastic strips like papers stiches in a deep cut. these were glued in place with plastic weld and left for and hour to set.

IMG_0941 by Glen Davis, on Flickr

To give the fuselage extra strength I used fibre glass to reinforce the whole aft end of this section.

IMG_0943 by Glen Davis, on Flickr

This will left over night to set.

I will continue with tail boom tomorrow

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07-08-2017 02:52 AM  80 days agoPost 146
206 pilot

rrVeteran

,Long Island,new york

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Dam glen, just saw the post, that's to bad but looks like an easy fix, at least it didn't explode all over the place like my 407 did in the early stages before the fuse was on, was doing a test flight in my garage in the winter and the Helicommand failed needless to say u know the rest hole machine was gone, so your lucky get on it get it ready.. Rich

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07-08-2017 01:39 PM  79 days agoPost 147
seaharrierman

rrApprentice

Gosport UK

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Thanks Rich

I've taken it on the chin. Was a blow but that's the nature of the beast. Works already started she will be ready

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07-08-2017 01:49 PM  79 days agoPost 148
seaharrierman

rrApprentice

Gosport UK

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Damage to the tail boom looks bad but after some thought it is repairable

IMG_0945 by Glen Davis, on Flickr

IMG_0946 by Glen Davis, on Flickr

IMG_0947 by Glen Davis, on Flickr

Same procedure as before.

Tape in position and paint on plastic weld

IMG_0948 by Glen Davis, on Flickr

IMG_0949 by Glen Davis, on Flickr

IMG_0950 by Glen Davis, on Flickr

0.25mm plastic stitches glued in with plastic weld

IMG_0951 by Glen Davis, on Flickr

IMG_0952 by Glen Davis, on Flickr

IMG_0953 by Glen Davis, on Flickr

sit back watch F1 qualifying while weld sets

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07-08-2017 08:42 PM  79 days agoPost 149
seaharrierman

rrApprentice

Gosport UK

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After F1 Qualifying

Deep in my useful bits draw I remembered I had some aluminium car repair mesh.

IMG_0954 by Glen Davis, on Flickr

I cut this to size and taking my time and a lit bit at a time shaped and fixed in place using 5 minute epoxy

IMG_0955 by Glen Davis, on Flickr

IMG_0961 by Glen Davis, on Flickr

IMG_0962 by Glen Davis, on Flickr

IMG_0964 by Glen Davis, on Flickr

Lit the bbq cooked dinner enjoyed a nice glass of wine

After dinner I applied a single layer of fibre glass to reinforce the repairs.

IMG_0965 by Glen Davis, on Flickr

IMG_0966 by Glen Davis, on Flickr

Will be left over night to cure fully before filling hole externally with car body filler

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07-10-2017 10:50 PM  77 days agoPost 150
seaharrierman

rrApprentice

Gosport UK

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Hi Guys

Yesterday I did filling and let it set over night.

IMG_0975 by Glen Davis, on Flickr

IMG_0976 by Glen Davis, on Flickr

IMG_0977 by Glen Davis, on Flickr

IMG_0978 by Glen Davis, on Flickr

This morning I started rubbing down very carefully to minimise the areas to be painted. stated with 80 grit to remove the excess then progressively using lighter grits to romove scratches.

IMG_0979 by Glen Davis, on Flickr

IMG_0980 by Glen Davis, on Flickr

IMG_0981 by Glen Davis, on Flickr

IMG_0982 by Glen Davis, on Flickr

IMG_0983 by Glen Davis, on Flickr

Another thin later of filler was applied to fill any blemishes

IMG_0984 by Glen Davis, on Flickr

IMG_0985 by Glen Davis, on Flickr

IMG_0986 by Glen Davis, on Flickr

IMG_0986 by Glen Davis, on Flickr

IMG_0987 by Glen Davis, on Flickr

I cleaned up the fuselages with wet wipes to remove all the dust and using blu tac tape and paper ready for priming

IMG_0988 by Glen Davis, on Flickr

IMG_0991 by Glen Davis, on Flickr

have primed this evening ready for first colour tomorrow

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07-11-2017 10:28 PM  76 days agoPost 151
seaharrierman

rrApprentice

Gosport UK

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Masking removed the repair has now become invisible

IMG_0993 by Glen Davis, on Flickr

A quick rub down with 600 wet and dry with warm soapy water the rinsed and allowed to dry

Then masked again and 3 coats of sand colour applied once dry masking removed

IMG_0995 by Glen Davis, on Flickr

IMG_0996 by Glen Davis, on Flickr

There is a small run than needs rubbing back in morning then apply the pink. the Sand will darken to match when lacquer if applied later

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07-11-2017 11:21 PM  76 days agoPost 152
v22chap

rrKey Veteran

Granger, Indiana

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fantastic ,, and that is one thing about doing the weathering as you can have areas that are a little different and by the time you get the weathering on the mended places it is all going to disappear !!!!
I probably wouldn't have taken the time to put all the patches inside and just went with them on the outside as doubler panels and such ,,but it is fantastic and quick

Larry C ----------Bergen R/C helicopters

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07-13-2017 07:44 AM  74 days agoPost 153
seaharrierman

rrApprentice

Gosport UK

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Thanks Larry

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07-13-2017 07:45 AM  74 days agoPost 154
seaharrierman

rrApprentice

Gosport UK

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Hi Guys

Did the pink yesterday. The repairs appear to be invisible I'm really pleased with the results.

IMG_1029 by Glen Davis, on Flickr

IMG_1030 by Glen Davis, on Flickr

IMG_1031 by Glen Davis, on Flickr

IMG_1032 by Glen Davis, on Flickr

IMG_1033 by Glen Davis, on Flickr

I am really pleased with results so far. Today she will get a coat of gloss cote and reinforce the skid end blocks one has decided to get knocked off

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07-13-2017 12:10 PM  74 days agoPost 155
Thumper217

rrApprentice

Slidell, LA - USA

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Really nice work. So glad to see it getting all fixed up and ready to fly again. Great detailed posts showing your methods, that's very helpful.

Now I know where to send my helis for repairs....

Andrew

Thumper

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07-21-2017 09:01 PM  66 days agoPost 156
seaharrierman

rrApprentice

Gosport UK

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Thanks Andrew

She should be flying this weekend at scale flying local to me

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07-22-2017 03:02 AM  65 days agoPost 157
206 pilot

rrVeteran

,Long Island,new york

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Really nice glen, great come back!!! Rich

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07-22-2017 12:27 PM  65 days agoPost 158
seaharrierman

rrApprentice

Gosport UK

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Thanks rich

She's getting there

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07-22-2017 07:43 PM  65 days agoPost 159
seaharrierman

rrApprentice

Gosport UK

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Apologies for not posting more but had some family issues that required all my time no the crisis is over I have work balls out to be ready for helipad tomorrow

weathering done

IMG_1072 by Glen Davis, on Flickr

I decided to replace the rotor blades so spent 2 hours yesterday afternoon get the new set perfectly balanced then primed. I hung them from a pvc pipe frame

IMG_1074 by Glen Davis, on Flickr

IMG_1076 by Glen Davis, on Flickr

more to come later

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07-22-2017 10:54 PM  65 days agoPost 160
seaharrierman

rrApprentice

Gosport UK

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Been working hard all day fully mechanics re assembled and fitted shes looking as good as new

IMG_1077 by Glen Davis, on Flickr

IMG_1078 by Glen Davis, on Flickr

IMG_1079 by Glen Davis, on Flickr

IMG_1080 by Glen Davis, on Flickr

IMG_1081 by Glen Davis, on Flickr

just waiting for main blades to dry and in morning do the lining

IMG_1083 by Glen Davis, on Flickr

once done of to helipad for the scale fly in

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Scorpion Power Scorpion Power
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