Re: Resin volume placed on foam


Jay Scheevel
 

Hi Eugen,

 

Don’t get too quantitative on your numbers. You want to make sure you have enough to fully wet-out the layup. More epoxy means more weight, but lack of epoxy means loss of strength, so there if you err, you must err on the wet end of the spectrum.

 

Since you are vacuum bagging the layup, you will want to use enough epoxy to assure the layup is wetted properly, then let the vacuum process squeeze out the excess. Make sure no air is in the layup, then let the absorbant layer on top of the release layer soak up the excess. Good luck.

 

Cheers,

Jay

 

From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Eugen Pilarski
Sent: Tuesday, March 23, 2021 6:31 AM
To: main@Q-List.groups.io
Subject: [Q-List] Resin volume placed on foam

 

Dear Q-community,

the bulkheads of the Q1 are already cut and the worktable for vacuum-wrap is ready to go. After I study again the Quickie wokshop manual on page 3-11 in Step 7: Squeegeeing .......... If you’ve done an excellent job, the weight of resin will be about 2/3 of the weight of cloth used. ........

So we use glass with a weight of 296g/m2 and based on the number of Step 7 in Quickie built manual show up, that the requested resin will be 200g/m2 ( 2/3 of 300g/m is 200g). Is that correct?

But the laminate calculator of R&G get me out 243 g/m2 and is 20% more that Rutan numbers indicate, please find the link below: R&G laminate calculator 

Framework:
Fibre type: glass fibre - 2.6 g/cm3
Areal weight: 296g/m2
Fibre volume fraction: Hand-lay-up 35%
Number of layers: 1
Laminate thickness: 1mm
Width: 1000 mm
Lenkt: 1000 mm
Resin type: Epoxy Resin  - 1.15 g/cm3

print

Result:

Number of layers

1 Layers

Laminate thickness

0.33 mm

Fibre reinforcement surface area

1.00 m²

Fibre reinforcement gross weight

296 g

Resin quantity

243 g

Laminate weight

539 g

Fibre content (weight) 

54.9 %

Fibre content (volume)

35.0 %


Did you guys fixed a resin volume per square meter during your building process as maximum or just the wet as should and dry as possible rule? 

I ask to understood how may resin should be placed on the foam to reach the material strength and stay in low weight at all parts that need to produce. So sounds like the old story......

Best regards

Eugen 

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