Is dope fuel-proof ?
Jeff Preou
Might be a silly question to some but I simply don't know !
Jeff
jpr...@ihug.co.nz
http://homepages.ihug.co.nz/~jpreou/index.htm
MEpst22487
>Subject: Is dope fuel-proof ?
>From: jpr...@ihug.co.nz (Jeff Preou)
>Date: Sun, 10 Aug 1997 08:45:53 GMT
>Message-ID: <33ee7ebf...@news.ihug.co.nz>
Nitrate dope is NOT fuel proof. Butyrate is. Mitch
Gerald43
>Might be a silly question
It's a good question!
Butyrate (like Sig dope) dope is fuel resistant up to about 15% nitro.
You also can't let the fuel stand on the finish for very long. I'd use
polyurethane enamel.
Gera...@aol.com
10-year scratch builder
10-year Instructor, Western Carolina R/C
8-year Contest Director
all...@erols.com
Just to throw my 2 cents on this.
Nitrate dope is not fuel proof.
I use Randolph Butyrate dope a lot and have had some trouble with cold
raw fuel dissolving the color coats. Had a long talk with a mfgs rep
from Randolph one day and he said that the dope formulas have been
somewhat reformulated over the years due to EPA regs and product
availability. He suggested that a clear coat of their 9701 clear should
be raw fuel proof as its formula has not changed over the years. He
also suggested that a test panel be made up which of course I have not
yet done. The dope appears to be fuel proof against engine oil residue
so far (2 plus years on my 1/4 scale Citabria). I have also used a
water based polyurethane clear coat over Randolph dope and that also
appears to be fuel proof. I usually get my Randolph Dope from Aircraft
Spruce in california, sometimes you can get it from a local Fixed Based
Operator (FBO) at a local airport. I have never used SIG dope but I
have had people tell me it is repackeged Randolph products but I do not
know if this is correct or not. FYI Brian Allen
--
MZ?
Red Scholefield
On Sun, 10 Aug 1997, Jeff Preou wrote:
> Might be a silly question to some but I simply don't know !
>
> Jeff
> jpr...@ihug.co.nz
> http://homepages.ihug.co.nz/~jpreou/index.htm
>
It depends on what kind you use. One is and one isn't, I think nitrate
dope isn't and beautrate (sp) is. Maybe someone else knows for sure. Also
the amount of nitro in the fuel makes a difference.
________________ Red Scholefield _______________
\_____________ AMA 951 IMAA 18939 _____________/
\__________ Flying Gators Inc. __________/
\________Gainesville, FL ________/
Olin K. McDaniel
>
>On Sun, 10 Aug 1997, Jeff Preou wrote:
>
>> Might be a silly question to some but I simply don't know !
>>
>> Jeff
>> jpr...@ihug.co.nz
>> http://homepages.ihug.co.nz/~jpreou/index.htm
>>
>
>It depends on what kind you use. One is and one isn't, I think nitrate
>dope isn't and beautrate (sp) is. Maybe someone else knows for sure. Also
>the amount of nitro in the fuel makes a difference.
>
>________________ Red Scholefield _______________
>
Those answers are correct. The amount of nitro you can safely use can
best be determined by trial and error, due to variations in the brand
of the butyrate (proper spelling, HI) dope. Best butyrate I ever used
was bought by the gallon at a small private airport, but you need to
buy some thinner too.
Olin McDaniel
Nathalie Desjardins
On Sun, 10 Aug 1997 08:45:53 GMT, jpr...@ihug.co.nz (Jeff Preou)
wrote:
>Might be a silly question to some but I simply don't know !
>
> Jeff
> jpr...@ihug.co.nz
> http://homepages.ihug.co.nz/~jpreou/index.htm
Hi,
There are two kind of dopes: nitrate and butyrate based stuff.
Butyrate is fueproof. One brand in North America is Pactra. Nitrate
dope is NOT fuelproof. I use nitrate for free-flight and electric
models. I seldom use butyrate since I prefer modern covering films or
fabrics for gas powered plane. You can't mix both.
Their only common point is that they are both smelly and
represent health hazard. Be careful! I do covering jobs outdoor :)
Yves McDonald, VE2 YMV
Montreal, (QC)
Canada
Gord Schindler
In <33efc8d9...@news1.sympatico.ca>, nathalie....@sympatico.ca (Nathalie Desjardins) writes:
>On Sun, 10 Aug 1997 08:45:53 GMT, jpr...@ihug.co.nz (Jeff Preou)
>wrote:
>
>>Might be a silly question to some but I simply don't know !
>>
>> Jeff
>> jpr...@ihug.co.nz
>> http://homepages.ihug.co.nz/~jpreou/index.htm
>
You can apply butyrate OVER nitrate but not the other way around. Why then use
nitrate at all?? Because when you cover an A/C with a dacron fabric such as Stitts
or Sig Coverall, butyrate does not stick to it so swell. So, you use nitrate to stick the
fabric on plus give the fabric a couple of coats of nitrate and then finish with the
butyrate. Butyrate alone over the fabric has a tendency to peel. Some of these things
are not so important on our models but on a full scale A/C if you applied the fabric
with Butyrate it could possibly lift away from the structure.
Regards,
Gord Schindler
**REMOVE THE ASTERISKS AROUND MY NAME TO REPLY..SICK OF SPAM**