[1984]

continuation of this post...

Originally Posted by 1984

m-105p/pa – 1020-1050 hp at sl (nominal power, + 5 min. forzash with 1100 hp only before 200? m)...

apparently, for m-105p nominal power it's exactly 1020 hp at sl and 1100 hp as forsazh...

and interesting, in all tests of planes with m-105p/pa speed at sl with 1100 or 1020 ie for example, speed of serial yak-1 around 470-480 kph at sl can be more? apparently, just need to reread great "yak-1" by Kuznecov...

well, anyway, 110 hp gives for yak-1,7,9 in 42-43 - only my opinion - around 15 kph (in total, confirmed in one document, later about this and yak-7b/lagg-3 in 42)...

well, "around 15" it's my very conservative estimate, in fact mainly in books 20 or even 24-28 kph at sl... so, if around +20 by PF for yaks/laggs it's because 190 hp, around +10 for yak with pf2 true and now, i think... and my real opinion, at this moment, even can be little more...

Originally Posted by 1984

next, we know what in 44 yak-9 (m,d,t) in good condition had 525-545 kph at sl and >537-540, maybe, because new prop (like vish-105v4 for la-5fn/7)...

again, about speed of yak-9m and other yaks in 44 ie strange sharp decrease in speed - 518 kph at sl for many planes in some tests and sources what we have - attached table from Stepanec, for example...

in fact, quality, operation of planes and aerodynamics was even better, for example, for yak-9m new antenna, prop (maybe), maybe even because new ends of wings and have only one reason - фильтр-пылеулавливатель на входе в двигатель - ie filter at air intake against dust etc...

my opinion, filter was like for la-7 (attached one of variants) and works similar -

При взлете и посадке (выпущенных шасси) входные отверстия всасывающих патрубков были закрыты заслонками, а воздух в мотор поступал через расположенные рядом «карманы» с мелкой сеткой «Дельбах» на входе. При уборке шасси заслонки механически открывались, а «карманы» — закрывались, и забор воздуха шел через штатные всасывающие патрубки.

and in fact on yaks-9m it's only small window with mesh, closed in flight, between wheels, and 2 retractable dampers on air intakes (attached photo and part of drawing with prospective view of filter)...

well, maybe it's answer, but personally i think what it's not can be reason for -15-26 kph at sl and it's just too much for approval of VVS and simple filter...

and interesting mention of filter for yak-1 (from "yak-1" by Kuznecov again) -

Лишь к маю 1944 г. (по сути дела, к концу выпуска Як-1) был разработан, испытан и рекомендован к использованию в ВВС КА воздушный фильтр конструкции ВВС СФ с измененной кинематикой управления заслонкой, предложенной опытным заводом НИИ ВВС КА. Этот фильтр не снижал максимальную скорость полета в отличие от других пылефильтров.

yak-9m ie first plane of 25 serie began to produce in may'44 too, so, apparently it's filter and for yak-9m...

so, my opinion at this moment, as before, "518 kph" it's mainly because art-41... or it's speed of one plane of first? serie which was tested in dec'44 (plane could be old/repaired/with some first defects etc)... or error... or just i'm wrong or forgot something, but it's strange, personally for me no any clear answers and reasons why so, and i think we all can only guess or carefully read all what we have...

for example, interesting quote about "vish-61p of 9 serie" whish was successfully tested in april'44 on yak-9-37 ie yak-9t, and yak have 544 kph at sl, and in end "suitable for installation on yak with ns-37" -

20 апреля 1944 года зам. гл. конструктора ОКБ Вигант.

Результаты испытаний самолета ЯК-9-37 с винтами ВИШ-61П 9 серии

Винт ВИШ-61П 9 серии, установленный на самолете ЯК-9-37 прошел совместные, ЛИИ и ОКБ завода N 115, испытания, на основании которых можно сделать следующие выводы:
1. Монтаж винта ВИШ-61П 9 серии аналогичен винту ВИШ-61П.
2. Винт допускает установку серийного кока, при условии переделки храповика.
3. Габариты втулки винта позволяют установку пушки 11 П калибра 37 мм.
4. Управление винтом ВИШ-61 П 9 серии аналогично винту ВИШ-61П.
5. При летных испытаниях самолета ЯК-9-37 с винтом ВИШ-61П 9 серии, получены следующие летные характеристики:
Максимальная скорость у земли 544 км/час Максимальная скорость на 2-й границе высотности 613 км/час Скороподъемность на 5000 м 5,4 мин. Заключение
Винт ВИШ-61П серии 9 пригоден для установки на самолетах ЯК-9 с пушкой 11п калибра 37 мм (1821).

well, it's can be experimental prop/work, or it's just test of 9 serie, but personally i don't know about really new props exept vish-105sv for yak-9m, and props which really gives any number of kph like vish-105v-4 for la-5/7, so, apparently, it's just can be confirmation of 540-544 for serial yak-9x...

explanation can be in following report, but personally i not have this document -

21 октября 1944 Нач. ЛИИ А.В.Чесалов писал письмо N 731с НКАП А.И.Ш. в сопровождение отчета "Сравнительные летные испытания Як-9Г N 1115315 с ВИШ-105СВ, ВИШ-105СВ01, ВИШ-105СВ01 с профилированной комлевой частью, ВИШ-105СВ02 и ВИШ-61Ц2 (2564,30).

and little bit about yak-9k -

8 ноября 1944 года зам. Нач. 7 ГУ Залесский подготовил: Данные по вооружению самолетов...

Наименование с-тов Существующее вооружение

Як-9Т М-105ПФ пулем. УБС 200

пушка НС-45 30

ie, apparently, "тщательная укладка" for K it's 30 shells, in 4.09 29, but personally i'm not really sure what 30 it's true, so...


and just about ammunition for yaks - simple logical chain - yak-7b with high gargrot, m-105pa or m-105pf, had shvak (120 shells) + 2 UBS (left - 260 rounds, right - 140)... yak-7DI ie prototype of yak-9 had motor-cannon and LEFT UBS with recommended ammunition 140/240 ie similar with yak-1b of late series (135-140/220-240)... plus, yak-9t could have 32/220 and 120+220 for yak-9d from справочник основных данных самолетов'45... so, i think yaks-9 really had around 140+240 shells/rounds max., less it's restrictions for some reasons (weight, typical ammoload for all etc)... well, or i'm wrong in something...

and just about yaks, need in addition to correctly front bulletproof glass (and maybe new rear glass), important things like "бензиномер" ie fuel gauges on wings, "солдатик" ie landing gear indicators on wings, mirror, window for release of cartridges, and other little things...