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<H1> Fesselflug</H1>
Das ist eine Fesselflug Seite des Münchner Fesselflug Teams CTM. Motorenforschung! Pulsostrahljet!<br><br>
<h1 align="Center">The HLM - HiStory</h1>
<div align="Left"> The HLM engines are homebuilt engines which are designed
to meet the special demands of control line combat competition engines.
Father of this engines is Lothar. As a teenager he was strongly
influenced
by the CTM-Team. During his high school time he had to work on lathes
and mills and took the chance to make a CTM-crankshaft by himself. Jonny
(the famous manufacturer of the CTM engines) gave him many helpful tips.
Con-rods, venturis and glow-plug inserts were produced on a little
clockmaker
lathe at home and his slightly modified CTM-engines were running very
well. After the intake-restriction rule got valid in 1988, the CTM-engines
were not able to keep up with the NELSON, USE and the upcomming russian
engines. Improvements of the performance of the CTM engines seemed to
be impossible.<br>
<br>
In autumn 1988 Lothar decided to build his first own engine,
the HLM-1. Due to the fact that mid air collisions and ground hits
are not avoidable, it should be an engine with rear intake to prevent
dirt contamination of the high precision inside of the engine as in
case with front intake engines. In Lothars opinion, integral cylinders
are the optimum solution to get maximum stiffness against warping and
optimized
heat transfer to the cooling fins. A right hand side exhaust with the
possibility
to mount a silencer and a strong crankshaft should be further features
of this engine. The idea was: putting the best parts together in one
engine should result in the most powerful one. The cylinder was ordered
from JHP motorparts which were selling the USE parts at this time
and the rear intake was ordered from Henry Nelson. The crankcase was
made from an annealed sand cast aluminiun alloy (AlSi10Mg) with milled
scavenging ports. The crankshaft was made from an annealed steel with
the german alloy code 30 CrNiMo8. It was working in a 12x24x6 mm rear
bearing and a 8x16x5 mm front bearing. The propeller screw (M5 thread,
30 mm long) meets the crankshaft thread behind the front bearing to avoid
tensile and multiaxial stress concentration in the score behind the front
bearing. A very rigid conrod (28 mm from pin to pin) with a bronze bushing
in the big end was used to translate the piston forces into torque.<br>
First flight was at the Ljimfords Competition 1989 in denmark.
Although one year of experimental work was spent on this engine, it
was not possible to get nearly the same power out than from current
ones . The bad results created the growing wish to get more knowledge
about the processes inside our engines and forced the decision to make
in-cylinder and crankcase pressure measurements in Lothars final work
at the Fachhochschule München to get the degree of a Diplom Ingenieur.
<br>
<br>
The HLM-V1 was made for engine test purposes in summer
1990, because all available engines exept from the "Mockba" had
a combustion chamber which was screwed down with a threaded ring
and made it impossible to integrate a pressure transducer in the
cylinder
head. The crankshaft and the conrod was taken from the HLM-1 whereas
all the other parts exept the Nelson rear intake and the liner with
piston were machined. The liner was a standard LST (three chanel, chromed
brass).<br>
<br>
<br>
</div>
<div align="Center"><img src="HLM-V1.jpg" alt="HLM-V1" width="500"
height="427">
</div>
<br>
<br>
The HLM-V2 was not realised. It should get a fully machined
crankcase, but the delivered aluminium alloy was not the ordered
one and Lothar decided to make a steel mould for casting the (HLM-V3)
crankcase. <br>
<br>
Pouring liquid aluminium in the mold as it was seen at
PAW, was not the way to get usable crankcases. A test cast, done
by a professional factory to investigate the quality of the
solidification
regime was built up to the only one HLM-V3. This engine had milled
scavenging chanels and was fitted with the original HLM-1 crankshaft.
The integral cylinder was bought from Jura Arsentijew who produced
a series to replace USE cylinders and the rear intake system was
taken from NELSON. This engine showed a desireable power potential,
but the crankcase breaked during engine optimisation. <br>
<br>
After the good experiences with the HLM-V3 the HLM-V4
was developed. To avoid fracture of the crankcase it should be machined
from a strong aluminium alloy and a new crankcase design should
avoid stress concentration in front of the rear ball bearing (if we
consider the crankcase around the rear ball bearing as a ring which is
radial elastic and the crankcase in front of the rear ball bearing as
a shim which can be considered as radial stiff, we will get a high stress
concentration between ring and shim in case of radial loads). Four crankcases
of this engine type were made. All other parts were taken from the HLM-V3.
The serial number two with a selfmade rear intake was getting a real
successful engine. It was slightly faster than Lothars AKM engines but
it was difficult to adjust for maximum power especially in tight
maneuvers.
This engine was used successful for qualification in 1996 and during
the European Championships 1997.<br>
<br>
<br>
<div align="Center"><img src="HLM-V4.jpg" alt="HLM-V4-Motor">
</div>
<br>
<br>
A friend of Robert, working in a professional casting factory,
casted some crankcases from the HLM-V3 crankcase mould. The engine
which was built from this crankcases was the HLM-V5. Its difference
to the HLM-V3 is a 10 mm crankshaft, running in a 10x19x5 mm rear bearing.
Only one engine (from two) was finished in 1996. It was working well and
is now fitted with a L&L cylinder. <br>
<br>
<br>
<div align="Center"><img src="HLM-V5.jpg" alt="HLM-V5-Motor" width="500"
height="427">
</div>
<br>
<br>
The L&L engine was built in cooperation with Loet in
1997/1998. The mould for the die cast crankcase was turned out
by Lothar whereas Loet has done all the milling work. The first
17 wax castings were rear intake crankcases and after milling down
a small wall in the mould all further castings were front intake
crankcases.
<br>
Loet finished his engine in 1998, but his engine showed
vibration problems which were very difficult to locate. A comparison
of the torsional stiffness between Loets 12 mm diameter crankshaft
(with radial slot for front intake) and Lothars 10 mm diameter crankshaft
for rear intake showed that the torsional stiffness of Lothars crankshaft
was 2.5 times higher although it had a smaller diameter! But the real
reason for the vibration problems were not found. Loet got better results
in using the crankshaft from the MMB-Caziol engine. <br>
<br>
Lothars L&L engines are fitted with the above mentioned
10 mm diameter crankshaft, running in a 10x19x5 mm rear bearing like
the HLM-V5. 6 L&L rear intake crankcases were machined in spring
1999, 5 were finished. The photo shows a L&L engine with (AKM) cylinder
liner and piston.<br>
<br>
<br>
<div align="Center"><img src="LuL-liner.jpg" alt="LundL-Liner" width="500"
height="477">
</div>
<br>
<br>
In the last flight tests of a L&L it was faster than
an AKM which served as a reference. This L&L was damaged during
this test and Lothar decided on the way home to build the HLM-V6
(with a steel crankcase).<br>
<br>
The HLM-V6 engine is using cylinders which Lothar got from
Rob Metkemejer during casting of the L&L crankcases for the
promise to build up a combat engine with these cylinders. Rob built
this cylinder for his team race engine which are not fitted with silencers.
Because combat engines requires a silencer, an adapter was glued to the
cylinder. The crankshaft was taken from the L&L engine, but it is
running in a 10x22x6 mm rear bearing. To save weight, the engine mounts
are integrated in the rear intake backplate. <br>
<br>
<br>
<div align="Center"><img src="HLM-V6.jpg" alt="HLM-V6-Version1" width="500"
height="496">
</div>
<br>
<br>
The latest modification of the HLM-V6 is shown in the photo below.
It is a full integral cylinder which was mannufactured by BARTZ &
SCHALK using rapid prototyping methods (laser sintering) to get the model.
It was precision casted by RAPID METAL Technologies GmbH.<br>
<br>
<br>
<div align="Center"><img src="HLM-V6-Zylinder2.jpg" alt="HLM-V6-Zylinder2"
width="500" height="332">
</div>
<br>
<br>
<br>
A screenshot of the CAD-model of this engine is shown below. <br>
<br>
<div align="Center"><img src="HLM-V6-CAD.jpg" alt="HLM-V6-Version3"
width="800" height="623">
</div>
<br><br>
<div align="Center"><img src="Gussession1.jpg" alt="Foto Guss-Session">
</div>
<br>
<br>
<a
href="mailto:lothar@control-line-team.de?subject=CTM%28MotorenHistory%29:">(email lothar)</a>
<br><br>
hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
<br><br>hlm, history
Fesselflug, modellflug, f2d, combat, f2dcombat, control line,
aeromodelling, model flying, münchen, munich, germany, deutschland
Control Line Team F2D Combat Fesselflug Control Line München Munich
Germany Deutschland F2D Fuchsjagd Model Flying Aeromodelling
Modellbau Flugmodell Flugmodellbau Control Line Team F2D Combat
Fesselflug Control Line München Munich Germany Deutschland F2D
Fuchsjagd Model Flying Aeromodelling Modellbau Flugmodell Flugmodellbau
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