#2028 OR RD-13

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A000500020005-8
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 16, 2012
• Sequence Number: 5
• Publication Date: November 21, 1951
• Content Type: MISC

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Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
III . III
21 Novwmber 1951
#2028 or RD-13
This document is part of an integrated
W. It separated trom the tile it must he
gptematis raw,.
I. Characteristics subjected 0 individual
A. Starting
The RD-13 started very easily even on cold mornings, and this
was done with one ortwo cranks on the cord.
B. Running
The unit was tested under two conditions; first with the dust
cover off, and second with the dust cover On.
1. Dust cover off.
ST4erri
All tests were made with a load on the altinator.and the
following temptures resulted.
Carburator Cylinder Head Exhaust Cooling Air
6000 ---
120 F.
390 F.
540F.
280 F.
4000 ---
180 F.
400 F.
500 F.
220 F.
The engine would run at 6000 RM until throughly warm anqthen would
retard to 4000 RPM. A large fan was placed directly in line with the
carburetor and after about 30 seconds the engine advanced to 6000 RPM.
The fan was then turned off and a few minutes later the engine would
again retard to 4000 RPM. There were two Ways to get the engine up to
speed without using the fan. 1. by removing the entire load from the
a//ern1/or
altinator, or running the engine at even a slower RPM until the engine
cooled off enough,and then 6000 RPM could be obtained, but after several
minutes running time it would then retard to 4000. It must be noted that
this happened only on full or over 100% loads. On lights loads theqras
excellgnt speed regulation, but on full load or over,the engine ran with
the throttle wide open. This condition acts much like the SSW612.
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
WO IP
Page Two
en,
It was noted that the evrTm performed much better with a load than
'n
without, but never could get the engine to run perfectly smooth. There
would always be a slight variation in the RPM, which could be detected
by the sound. There seemed to be a lot of mechanical noise in the
engine.
2. Dust Cover On.
The following temperatures resulted with the cover on.
Intake Air
Cylinder Head
Exhaust
Cooling Air
6000-- 85 F.
460 F.
530 F.
340 F.
5000 110 F.
410 F.
390 F.
260 F.
4000 100 F.
400 F.
370 F.
260 F.
Started to test unit on cold morning and ran at 6000 RPM for 15 min.
then retarded to 4000RPM putting out 50W at 78 V. with the throttle
and choke wide open. The temperatures wemthen taken and recorded as
follows 1 exhaust 410 F. 1 cylinder head 450 F. 1 cooling air 330 F.,
and air intake 100 F. Under theye conditions a full load was on the
0,YerivA,r
-alti-nator. It was noted that when the unit was running at 6000 RPM
the cylinder head temperature was 460 F. the unit, oontinued to run
at this spped, but the temperature continued to increase until 480 F.
was reachedothen the engine would retard to 4000 F. Engine continued
to vary slightly in RPM as stated before, but ran much better with a
load.
A time test was taken with full load. Result,two and onequeatter
(24) hours per tank of fuel.
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
.prZ,
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
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Page Three,.
II. Breakdown
A. Cylinder and head
When the unit was run for the first time it was noted that
the cylinder head was leaking, SD the same was removed before any
Masts were made. Considerable carbon was found, thus indicating many
hours of ruuning time. The carbon was removed and the head was replaced,
but leakage still occured. After running most of the tests this way
the cylinder head WAS removed again,and a gasket made of .005" thick
was
aluminumA used, but leakage still occured. When the head was removed
the first time the piston f which have two rings, wer ice and tight,
but after about five hours running time the pistons had considerable
play, thus the writer agrees fully with the manufacturej statement that
the life of this engine is fifty (50) hours. The cylinder is made of
a steel barrel, around which the cooling fins are placed. The cooling
fins are cast in two parts lenght;risei thus almost requiring a hand fit
for every engine built this way. The top thl.-the cylinder was not ma4k
chined evenly, thus causing much of the leakage.
6
B. Carburetor.
From looking at the fittings on the carburetor one could tell
that the same had been removed many times. The fittings were not tight
and the carburator was disassembled three times using new gaskets and
permatex, but some leakage still occured. The carburetor is the up?
draft type, which adds considerable height to the engine. After mast
of the leakage was stopped the unit was run for about one half hour, and
6
a new leak started in the crankcase casting right next to the carbur#tor.
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8
IIP
Pare Pour
C. General
The only part of the unit that can be removed readily is the
spark plug. In order to remove the cylinder head, almost the entire
unit had to be disassembled, wlich took four hours, and the same time
to assemble. The unit is hard to work on as everything is so jammed
together, ?for example in order to remove the carburetor, the bottom
cover had to be removelic but to get the intake pipe off the carburetor,
the points had to be removed along with the frontplate se as to loosen
the sealed box containing the ingitinn system. After doing this the
clips holding the carburetor to the crankcase could be reached. In
order to remove the cylinder head, even moi-e extensive disassembly
had to be encountered.
There seemed to be considerable engine noise,coming from the carbur-
ator;;however this was noticed more with the cover off. During the
eil,le rfig /or
testing of the altin?itor^ which lasted about five hours running time, the
exhaust manifold had come loose, and when it was repaired,new threads
had to be made in the casting.
One nice feature of the RD-13 was the speed regulation on light
loads, but the engine had a tendency to increase in RPM; however,
al/e.rnal4or
with full load on the altinator there was no speed regulation to speak
/44ernertio ifs
of. When the short circuit test was made on the attlhatzr the engine
would drop in RPM and then after several seconds it-would stop.
Conclusion
The entire unit is too hard to get at readily, this is especially poor
a/71-e-Pnehlor
The altinetnr is too large, and the engine
could be shortened by means of a different type carburator.
?
STAT
Declassified in Part - Sanitized Copy Approved for Release 2012/08/16: CIA-RDP78-03535A000500020005-8