soviet planes and 4.1x...

[1984]

some interesting and actual findings about la-5/7...

about canopy of la-5fn and la-7 - "canopy can be fixed in front, rear and average position"...

we know what when canopy open it's -15-18 kph, but, apparently, pilot could fix canopy in average position ie WITHOUT serious loss of speed and tropical heat in cabine...

real view of rear bulletproof glass of, at least, la-5fn and la-7 from "technical description of la-7" (confirmed in "t.d. of la-5fn")...

about new front bulletproof glass and new tail wheel of la-7 from "technical description of la-7" - "solid front bulletproof glass... folding on earth and loss in flight of tail wheel now impossible" - ie not how here and maybe sometimes like in attached photo of czech? la-7...


about new stvorki (on english, it's, apparently... "leafs"... or "casements"...) of la-7, on sides of engine, and loss of speed i wrote before...


about conditions of "tropical heat" in cabine...

При полном закрытии створок капотов мотора температура воздуха в кабине летчика значительно повышается вследствие негерметичности противопожарной перегородки и недостаточной высоты ее, что утомляет летчика и затрудняет полет.

ie, because of defects of some first la-5/la-5fn and "with full closed "stvorki" temperature in cabine increases significantly" (well, it's what I supposed earlier)...

from special tests of defected la-7 -

7. Температура воздуха в кабине летчика при закрытом фонаре достигает 47°Ц на номинальном режиме работы мотора и свыше 60°Ц на максимальном режиме работы мотора...

Улучшение герметизации кабины снижает температуры воздуха на 8-10°Ц.

ie, "with closed canopy and nominal power temperature in cabine of la-7 with normal quality - around 38 degrees in area of feet" (ie, only my opinion, just means from cold to terrible russian winter and against beginning of diseases)...


and i just remind real speeds of best serial la-7 which found - speed on nominal power, 582 kph at sl (or even 587 ie la-7 s.n. 38101364), on forsazh - best + from forsazh, 39 kph - ie can be 621 kph at sl (speed of prototype, on nominal, 597 kph at sl, of etalon for production - apparently, 590)...

ie my theory only confirmed...


and attached table with one of confirmations, in some sense, of 10 min of forsazh for, at least, la-7 (more, with great docs and about m-82s, later) and table with just normal performances of soviet fighters 43-45...

for la-7 was taken performance of plane with serial number 38102663 ie 663 or 63 plane of 2 or 26 serie of 381 plant, which was produced in may'45 and was armed with 3 b-20...