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Precedent Stampe 1/4 Scale

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bert baker17/11/2019 16:10:13
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1523 forum posts
317 photos

Awww shucks,,,

Go on then Cymaz

How do you know

Martin McIntosh17/11/2019 16:19:34
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3144 forum posts
1133 photos

Mine turned out spot on 1" forward of the top wing TE with a 155. Changing to a 180 made no real difference in this respect. I just put the servos wherever they fitted best and the battery in front of the bottom wing, modern gear being light enough to make little difference. Covering is Solartex.

cymaz17/11/2019 17:09:57
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9004 forum posts
1187 photos
Posted by bert baker on 17/11/2019 16:10:13:

Awww shucks,,,

Go on then Cymaz

How do you know

As you asked so nicely Bert.... I found the CG was far too reward. I’m sure Bert will remind me which thread page it’s on as it was talked about in some detail.

over to you Bert laugh

bert baker17/11/2019 17:51:41
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1523 forum posts
317 photos

It was a dark and stormy night.

Soz I must have slept to long this afternoon

was the paint for the Sunburst lead paint

been so many comments about the same stuff so many times it’s probably page 150 is but  I’m not looking

 

 

Hat and coat at the ready

Edited By bert baker on 17/11/2019 18:01:22

Nick Somerville23/11/2019 17:55:31
46 forum posts
34 photos

Progress continues and today completed both centre sections and have made a start on the wings themselves.

So John Hill got me thinking with his nifty use of flat carbon strips to strengthen his trailing edges. Well it's a bit of a trek to find something similar but from my scale glider building days I had a spool of carbon fibre tows. You can set them off with epoxy resin for best strength but they also go rock hard with thin cyano.

Excuse the couple of pictures that I have not found a way to rotate within my album but hopefully you can see the steps.

1. tape the two trailing edge strips together on the TE with masking tape.

img_5835.jpg

2. Stretch the carbon tow taught with the help of some pins etc. and then position in the inside of the two TE strips.

img_5836.jpg

3. use pins to set the angle to match the rib section and then run a thin bead of low viscosity cyano.

img_5839.jpg

4. 30 secs later peel off the tape and voila, a very stiff and straight TE with very little added weight that can be sanded as thin as you wish.

I also have several lengths of pre epoxied woven carbon fibre shear web material. I plan to use these to add additional strength on the transition between the centre section and out along the wings for a distance to address the weak point that has been mentioned by several others in this thread. Pics to follow when adding them in.

bert baker23/11/2019 18:49:53
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1523 forum posts
317 photos

Good idea Nick I’ve seen the LMA boys do it with piano wire.

but can’t say ive ever had any issues.

My next one I will be looking to make it as light as I can.

I really would like to get one under 7kg

That will be a challenge for me as I don’t build light

cymaz23/11/2019 19:12:26
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9004 forum posts
1187 photos
Posted by bert baker on 23/11/2019 18:49:53:

Good idea Nick I’ve seen the LMA boys do it with piano wire.

but can’t say ive ever had any issues.

My next one I will be looking to make it as light as I can.

I really would like to get one under 7kg

That will be a challenge for me as I don’t build light

If mine came out at just over 8 kg, ( and always build heavy...I don’t know how), then I’m sure you’ll make 7kg or under.

bert baker23/11/2019 19:19:35
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1523 forum posts
317 photos

I am now thinking what is the lightest tex type covering,

standard tex ,, poss dope and some form of tex

cymaz23/11/2019 19:42:31
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9004 forum posts
1187 photos

Nylon and dope?

bert baker23/11/2019 19:50:14
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1523 forum posts
317 photos

I’ve been offered some stuff a bit like Diatex 1000

Nick Somerville26/11/2019 11:18:31
46 forum posts
34 photos

Been trying To find the enthusiasm to cut and bend up all the various cabane cross parts as I am a bit ham fisted with soldering/ metal work. I liked the ‘hold it all together’ with small cable ties shown on here before so popped down to the local diy for some cable ties, but bought these instead. Seems like I should be able to hold it all together and solder at the same time.

2d18edc1-cf72-4b4e-838e-83332b6aac96.jpeg

Martyn K26/11/2019 15:15:44
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5041 forum posts
3677 photos
Posted by Phil B on 16/11/2019 20:16:55:

I am just doing a test, stripping Solartex from the tail of a Junior 60 and replacing with polyester, so I can see what weight difference there is. Solartex is about 90 g per sq m, so I think your 40g poly is likely to come out lighter. Solar film polyester is 60g including the adhesive so is probably lighter but a lot dearer.

Hi Phil

Any more thoughts on the Polyester? Is the process

1. stick it down at the edges,

2, heat shrink then

3. dope to finish?

How fine grained is it and how much dope did you need? I may try some of the silver for my Hawker Fury..

Thanks

Martyn

Adrian Hazeldine11/12/2019 17:11:15
9 forum posts

Hi,

Hope it's ok to jump on here to ask a couple of Stampe questions...

I've picked up an old 1/4 Stampe to refurbish - it's originally been done in the Rothman's scheme but it's tired and in need of recovering etc. I'd assumed it was a Precedent Stampe but then someone mentioned there is a Svenson Stampe too - (hope I've got that right)

I need to try and get some info - but first need to check which model it is; are there any obvious differences between the 2 kits?

Also - I'm looking at a 30cc 4 stroke petrol for this - Saito FG30 perhaps; does that sound in the right ballpark?

thanks!

Edited By Adrian Hazeldine on 11/12/2019 17:30:32

cymaz11/12/2019 17:35:16
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9004 forum posts
1187 photos

I had both. The only difference is that my Svenson , you had to join the wings, plug together . The fuselage was 2” shorter. I glued my Svenson Wings together.

Weigh the model. Both of mine are 8kg, both had 33cc two strokes. Ample power for general flying with a bit spare for landing or to get you out of trouble.

bert baker11/12/2019 17:42:15
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1523 forum posts
317 photos

Hi Adrian,

The Svenson Stampe has a one piece bottom wing, the top wing has a centre section fixed to the cabaines and has two wing panels that plug in to it. And it ushally has a enclosed canopy that spreads across both front and rear cockpits

The Precedent Stampe has one piece wings top and bottom and can be in single or double open cockpits

Im not that familiar with the power output of the Satio, but It will prop be ok as the Stampe’s seem quite happy on a broad range of engine choice

bert baker11/12/2019 17:44:48
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1523 forum posts
317 photos

p6290031.jpg

bert baker11/12/2019 17:46:09
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1523 forum posts
317 photos

That is a Svenson Stampe,,, the other diferance is the cowl had a removable front section

bert baker11/12/2019 17:47:46
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1523 forum posts
317 photos

svenson size.jpg

Adrian Hazeldine11/12/2019 17:55:42
9 forum posts

Thanks Cymaz / Bert.

Definitely looks like mine is the Precedent kit as it's got one piece wings top and bottom and a single open cockpit.

The cowl needs replacing but I think they are still available.

Martin McIntosh11/12/2019 17:56:55
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3144 forum posts
1133 photos

Go for a Laser 180 glow any day. The 10cc on the box makes me giggle. The prototype may have used one but it was geared. Recently upgraded mine from a 155 to the 180 but only because I wanted to swap engines with another model. My Precedent one was only 6.2kg when built.

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