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View Full Version : Lavochkin La-7R (Rocket Assisted)



woofiedog
10-12-2006, 12:59 AM
http://www.warbirdpictures.com/VVS1/La7R-11.jpg

Links:
http://www.vvs-regia-avions.com/VVSHTML/vla791.htm
http://ram-home.com/ram-old/indexq.html

The aircraft was also used as a testbed to explore advanced propulsion systems, including a tail-mounted liquid-fuelled rocket engine (La-7R), two under-wing pulsejets (La-7D), and two under-wing ramjets (La-7S). None of these variants proved worth pursuing, and turbojet technology quickly overtook them.

http://www.warbirdpictures.com/VVS1/La7R-12s.jpg

In the very end of 1944 Lavochkin KB built two experimental variants of popular La-7 fighter with additional RD-1 and RD-1KhZ liquid rocket engines. Those engines provided 300kg of thrust and differed only by ignition system.

http://www.warbirdpictures.com/VVS1/La7R-13s.jpg

http://ram-home.com/ram-old/la-7r-sh2p224a-prev.jpg
35k b/w with the booster exposed
"History of aircraft construction in the USSR", Vol.2 p.224
http://www.ctrl-c.liu.se/misc/RAM/fr-la-7r-2.jpg

RD-1 units were installed in the small fairing under the tailplane (which was raised to provide the room for engine). Rocket fuel consisted of 90l kerosene and 180l H2NO3. Fuel tanks for 'native' piston engine could hold in this configuration only 215kg of gasoline.

During trials (15 flights by pilots G.M.Shijanov and A.V.Davydov) two non-fatal accident took place, both involving explosion of the RD-1 booster. On May 12, 1945 RD-1 exploded on the ground. Another explosion took place during flight, but strong airframe of the La-7 and G.M.Shijanov's skills saved the aircraft. It was demonstrated later (August 18, 1946) at Tushino aviation parade with operating RD-1.

Despite RD-1 allowed to gain 80km/h for short 3...3.5km/h, handling and maneuverability suffered. It was obvious that more efforts are needed.


A quick couple notes:

The La-7S was fitted with two Bondaryuk VDR-430 ramjets under it's wings. Flown in September 1946 it managed a increase in top speed of 64 km/h.

The La-7 PuVRD or PVRD had two RD-13 pulsejets fitted under the wings, which gave it a top speed of 800 km/h at 8,000 m

Link: http://tanks45.tripod.com/Jets45/Histories/La-7S/La-7S.htm


The RD-1 was a liquid-fueled rocket developed from the ORM-65 by L.S.Dushkin and V.P.Glushko. Normal rating on RFNA/petrol was 300kg at sea level and more at high altitude, with fuel consumption 1.6kg/sec. Engine weight - 215kg.


The La-7 was the only Soviet fighter to shoot down a Messerschmitt Me-262, on one occasion over Germany on February 15, 1945.


Two Yak-3s were experimentally fitted with the Klimov M-107 engine, with 1,500 horsepower, and at least one of the two was later fitted with the Klimov M-108 engine, with 1,550 horsepower. The performance of these aircraft was outstanding, but the engines were unreliable, and at the time jet engines were clearly the way of the future.


Yak-3RD (Yak-3D) - experimental aircraft with an auxiliary Glushko RD-1 liquid-fuel rocket engine with 2,9 kN (650 lbf) of thrust in the modified tail, armed with a single 23 mm Nudelman-Suranov NS-23 cannon with 60 rounds of ammunition. On May 11, 1945, the aircraft reached 782 km/h (485 mph) at 7,800 m (25,585 ft). During the August 16 test flight, the aircraft crashed for unknown reasons, killing the test pilot V.L. Rastorguev. Like all mixed powerplant aircraft of the time, the project was abandoned in favor of turbojet engines.


Pe-2RU rocked boosted bomber by S.P.Korolev and V.M.Myasichev. In 1943 a liquid rocket booster RD-1 was installed at aircraft extreme tail. Booster provided 300kg of thrust. During trials in 1944 RD-1 exploded. S.P.Korolev (who supervised the booster installation) barely escaped.
Solid-state RATO bottles were also tried on Pe-2 (by pilot M.L.Gallai).
Both projects did not enter production.


Leonid Dushkin
Link: http://en.wikipedia.org/wiki/Leonid_Dushkin

woofiedog
10-12-2006, 12:59 AM
http://www.warbirdpictures.com/VVS1/La7R-11.jpg

Links:
http://www.vvs-regia-avions.com/VVSHTML/vla791.htm
http://ram-home.com/ram-old/indexq.html

The aircraft was also used as a testbed to explore advanced propulsion systems, including a tail-mounted liquid-fuelled rocket engine (La-7R), two under-wing pulsejets (La-7D), and two under-wing ramjets (La-7S). None of these variants proved worth pursuing, and turbojet technology quickly overtook them.

http://www.warbirdpictures.com/VVS1/La7R-12s.jpg

In the very end of 1944 Lavochkin KB built two experimental variants of popular La-7 fighter with additional RD-1 and RD-1KhZ liquid rocket engines. Those engines provided 300kg of thrust and differed only by ignition system.

http://www.warbirdpictures.com/VVS1/La7R-13s.jpg

http://ram-home.com/ram-old/la-7r-sh2p224a-prev.jpg
35k b/w with the booster exposed
"History of aircraft construction in the USSR", Vol.2 p.224
http://www.ctrl-c.liu.se/misc/RAM/fr-la-7r-2.jpg

RD-1 units were installed in the small fairing under the tailplane (which was raised to provide the room for engine). Rocket fuel consisted of 90l kerosene and 180l H2NO3. Fuel tanks for 'native' piston engine could hold in this configuration only 215kg of gasoline.

During trials (15 flights by pilots G.M.Shijanov and A.V.Davydov) two non-fatal accident took place, both involving explosion of the RD-1 booster. On May 12, 1945 RD-1 exploded on the ground. Another explosion took place during flight, but strong airframe of the La-7 and G.M.Shijanov's skills saved the aircraft. It was demonstrated later (August 18, 1946) at Tushino aviation parade with operating RD-1.

Despite RD-1 allowed to gain 80km/h for short 3...3.5km/h, handling and maneuverability suffered. It was obvious that more efforts are needed.


A quick couple notes:

The La-7S was fitted with two Bondaryuk VDR-430 ramjets under it's wings. Flown in September 1946 it managed a increase in top speed of 64 km/h.

The La-7 PuVRD or PVRD had two RD-13 pulsejets fitted under the wings, which gave it a top speed of 800 km/h at 8,000 m

Link: http://tanks45.tripod.com/Jets45/Histories/La-7S/La-7S.htm


The RD-1 was a liquid-fueled rocket developed from the ORM-65 by L.S.Dushkin and V.P.Glushko. Normal rating on RFNA/petrol was 300kg at sea level and more at high altitude, with fuel consumption 1.6kg/sec. Engine weight - 215kg.


The La-7 was the only Soviet fighter to shoot down a Messerschmitt Me-262, on one occasion over Germany on February 15, 1945.


Two Yak-3s were experimentally fitted with the Klimov M-107 engine, with 1,500 horsepower, and at least one of the two was later fitted with the Klimov M-108 engine, with 1,550 horsepower. The performance of these aircraft was outstanding, but the engines were unreliable, and at the time jet engines were clearly the way of the future.


Yak-3RD (Yak-3D) - experimental aircraft with an auxiliary Glushko RD-1 liquid-fuel rocket engine with 2,9 kN (650 lbf) of thrust in the modified tail, armed with a single 23 mm Nudelman-Suranov NS-23 cannon with 60 rounds of ammunition. On May 11, 1945, the aircraft reached 782 km/h (485 mph) at 7,800 m (25,585 ft). During the August 16 test flight, the aircraft crashed for unknown reasons, killing the test pilot V.L. Rastorguev. Like all mixed powerplant aircraft of the time, the project was abandoned in favor of turbojet engines.


Pe-2RU rocked boosted bomber by S.P.Korolev and V.M.Myasichev. In 1943 a liquid rocket booster RD-1 was installed at aircraft extreme tail. Booster provided 300kg of thrust. During trials in 1944 RD-1 exploded. S.P.Korolev (who supervised the booster installation) barely escaped.
Solid-state RATO bottles were also tried on Pe-2 (by pilot M.L.Gallai).
Both projects did not enter production.


Leonid Dushkin
Link: http://en.wikipedia.org/wiki/Leonid_Dushkin

CAF96th_Sillyak
10-12-2006, 01:21 AM
intresting read, thanks for sharing

Klemm.co
01-21-2007, 06:23 AM
I remember reading this thread... a long time ago. http://forums.ubi.com/images/smilies/16x16_smiley-indifferent.gif

oFZo
01-21-2007, 06:37 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Klemm.co:
I remember reading this thread... a long time ago. http://forums.ubi.com/images/smilies/16x16_smiley-indifferent.gif </div></BLOCKQUOTE>

What are you trying to say?

Klemm.co
01-21-2007, 07:30 AM
Ah, forget it.
I just find it strange to see all those zombie threads brought back to life on page one.

anarchy52
01-21-2007, 07:44 AM
With 215kg in the extreme rear of the aircraft, it's no wonder the handling suffered. I wonder if it's modeled in the game...

BillyTheKid_22
01-21-2007, 07:50 AM
http://forums.ubi.com/groupee_common/emoticons/icon_biggrin.gif

Brain32
01-21-2007, 07:54 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by anarchy52:
With 215kg in the extreme rear of the aircraft, it's no wonder the handling suffered. I wonder if it's modeled in the game... </div></BLOCKQUOTE>
I'll bet in 20Kn it's not http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

woofiedog
01-21-2007, 08:29 AM
A bit of a Time Warp... or maybe a trip on the old TV show The Time Tunnel. The forum is a little strange this morning! http://forums.ubi.com/images/smilies/shady.gif


CAF96th_Sillyak... Thank's