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Peterf's 1/4 scale Falcon Models Tiger Moth

Build log for my quarter scale Tiger Moth

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PeterF23/05/2017 18:00:53
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248 forum posts
358 photos

Manish,

Yes, I forgot to mention the hand grips, these were milled out from solid aluminium block. Machined a recess around the backside to create the mounting flange, then put it into the mill the other way around and cut out the hand slot with a ball end mill. Here is a close up photo. I did not take any before they were glued in.

The rods on the controls are just styrene.

dsc05132.jpg

Manish Chandrayan23/05/2017 19:24:01
294 forum posts
49 photos
Thanks Peter, I will beat out some from litho sheet. I did make some but they appear too small so will make larger ones
Manish Chandrayan25/05/2017 14:21:32
294 forum posts
49 photos

Made this today. Spring will be bolted to top and the bottom piece will be soldered on and then the assembly painted. 

What is the the considered opinion about best method to get the scale that needs to be affixed to the bottom of the ASI?

img_20170525_112414_01.jpg

img_20170525_112402_01.jpg

Edited By Manish Chandrayan on 25/05/2017 14:23:13

cymaz25/05/2017 19:31:09
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6713 forum posts
875 photos

The figures were just too small to put up n...so I ignored them. No one has noticed

gipsy moth detailing 001.jpg

PeterF25/05/2017 21:21:03
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248 forum posts
358 photos

Manish,

I hope you have calibrated the spring so that it is accurate.

For this sort of thing I have laser printed onto adhesive vinyl previously. I have bought the sheets of printable self adhesive vinyl sheets from ebay.

Manish Chandrayan26/05/2017 08:53:46
294 forum posts
49 photos

Oh dear Peter, now that you mention it, I will have to really calibrate the spring and the scale cheeky

Manish Chandrayan19/06/2017 11:55:44
294 forum posts
49 photos

Peter

I managed to hook up my ailerons closed loop and run into a problem. While I am getting the desired throw on either side, the aileron do not return to neutral. I have tried the following

1. Tightening and loosening the cables to vary the tension and see if it works

2. Loosening the idler bar to ensure that it is not binding

But despite these there was no improvement. Could you take a look a the video and see if you can spot that is causing the issue

Edited By Manish Chandrayan on 19/06/2017 11:57:25

Engine Doctor19/06/2017 14:45:10
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1694 forum posts
4 photos

If the nylon horn is the servo horn then it looks like the servo is not centering. What servo are you using ?

Manish Chandrayan19/06/2017 15:01:05
294 forum posts
49 photos

The crank that sticks out of the fuse bottom is 2mm G 10 sheet and runs on on brass tube bearing on 4mm bolt. The crank is operated by servo. The servo being used is KST 125 mg with 97 Oz torque

**LINK**

PeterF19/06/2017 20:58:50
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248 forum posts
358 photos
Manish,

I am with engine doctor on this one, the servo may not be centering properly. Is there any slop in the connection from servo arm to the crank, is the crank pivot sticky or very loose, is the crank in perfect alignment with the servo output arm. Is the crank pivot in line with the axis of the servo output arm. Is the position of the servo output to the crank sufficiently far from the pivot to get a full range of movement on the servo output arm. Finally, I am not sure that the servo is robust enough, it claims high torque, but it is still a mini servo the plane was designed to have one of these for each wing. Now you have one servo for both wings plus a complex multi stage scale rendition. I will check my servo specs.
PeterF19/06/2017 21:21:46
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248 forum posts
358 photos
My aileron servo is a Hitec HS-7955TG and running on 6.0V as my plane is set up for produces up to 333oz.in. of torque. I have also set the crank and output arm geometry to give maximum servo arm rotation which maximises leverage and minimises servo torque.
Manish Chandrayan21/06/2017 11:25:12
294 forum posts
49 photos
Posted by PeterF on 23/05/2016 22:04:36:

Here is a video of the ailerons all working very nicely if I may say so myself. The down going action is pretty close to full scale I believe, perhaps it does not quite return to neutral, but I can live with that. To try and make it return to neutral would require me to strip down th gear boxes and change the flats filed onto the shafts, and I am not planning on doing that now everything is so good. The up going movement is 2.5" which is 25% of full scale and the down going is about 3/4", which again is scale.

Peter

I see that even your ailerons do not return to neutral, what do you think is the cause? And if you do not fix that, will it not affect the flying?

PeterF21/06/2017 17:06:27
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248 forum posts
358 photos

I had not noticed that they were a tiny bit out. Will keep it in mind when I put it back together.

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