28
$\begingroup$

Looking at this soviet aircraft:

enter image description here
Source: muzealnictwo.com

Engineers from two distinct eras have met and created this biplane with a turbine! It seems the two big pottery pieces are actually tanks. What is this aircraft and why such design?

$\endgroup$
  • 11
    $\begingroup$ Despite looking like toilets, I'm fairly certain the tanks are not pottery. :) $\endgroup$ – egid Dec 6 '16 at 1:28
  • 6
    $\begingroup$ @egid, these were considered "bog standard" at the time. :) $\endgroup$ – Wossname Dec 6 '16 at 8:18
  • 1
    $\begingroup$ From the source page the image caption is 'Samolot PZL M-15 Belphegor (fot. Autor)' - indicating it's a PZL M-15 Belphegor. (Yeah, I know there's already an accepted answer, but it was fairly simple... Didn't even need to be able to read Polish. :/ ) $\endgroup$ – FreeMan Dec 7 '16 at 15:25
  • 1
    $\begingroup$ did you grab this from me off of Facebook? I posted it there yesterday. $\endgroup$ – rbp Dec 7 '16 at 17:36
  • 1
    $\begingroup$ identical image facebook.com/groups/41407135412/permalink/10158045611150413/… $\endgroup$ – rbp Dec 7 '16 at 18:27
43
$\begingroup$

It is the Polish PZL M-15, as you can read in the image if you zoom in. From Wikipedia:

The aircraft was designed in Poland in response to a Soviet requirement for a new agricultural plane.

Agricultural airplanes fly slow and having a shorter span increases the number of (air)fields you can land on. That's probably why they decided using a biplane design.

The two tanks outside the fuselage could have several reasons:

  • Placing the chemicals further away from the turbine and pilot
  • Reduce the bending moment at the wing root
  • Shorter pipes between the tank and the spray nozzles

All this, of course, at the cost of a lot of drag. As explained in the image source page, fuel consumption was three times larger than other agricultural airplanes and it had a really bad maneuverability.

The jet engine was a requirement dictated by Aeroflot, who wanted to use the same type of fuel for their passenger and agricultural airplanes.

$\endgroup$
  • 14
    $\begingroup$ The silliest part is that they could have simply used a turboprop... $\endgroup$ – UnrecognizedFallingObject Dec 5 '16 at 23:42
  • 9
    $\begingroup$ another reason to put the tanks there is to make for shorter pipes between the tanks and the spray nozzles. This was a pretty large aircraft for a crop duster, meant for the very large fields at Soviet collective farms, so needed a high capacity or it'd have to reload too often. $\endgroup$ – jwenting Dec 6 '16 at 7:05
21
$\begingroup$

That's a Mielec M-15 Belphegor, the world's only jet powered biplane. A jet agricultural aircraft, manufactured by PZL Mielec in Poland for Soviet agricultural aviation. For its strange looks and noisy engine it was nicknamed Belphegor, after the noisy demon.

https://www.pinterest.com/pin/271764158735045150/

$\endgroup$
  • 16
    $\begingroup$ World's only production jet powered biplane. Others exist $\endgroup$ – Dan Pichelman Dec 5 '16 at 20:19
  • 2
    $\begingroup$ Portions of this answer appear to be plagiarized from Wikipedia. $\endgroup$ – Columbia says Reinstate Monica Dec 6 '16 at 14:00
  • 1
    $\begingroup$ Depending on the definition of "jet", Coandă-1910 can be counted as one. A biplane, naturally. $\endgroup$ – Agent_L Dec 6 '16 at 17:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.