Internal modules are receiving heat - is it a bug or a feature?

[BechMeister]

I had this tiny lander craft I was landing on Duna. 

It consist of 3 stages - 1 stage for landing  (stage 0) and 2 stages to get into space. When I re-enter through Dunas atmosphere the internal modules take heat damage - I cannot understand why. The lander looks like this:

 

As you can see the Terrier engine is taking heat even if its fully obscured by the heatshield. Is it because I have landing legs sticking out of the side that can transfer heat to the body of the craft? is it because I stuck tiny engines out of the heatshield that can transfer heat? - or is it just a bug?

thx in advance.

[magnemoe]

The legs should not transfer heat. Either they burn up or not so this is an bug. Might be related to docking ports inside fairings heating up.

[BechMeister]

Okay thx.

I only have one docking port though. Thats the one on the nose of the capsule

[magnemoe]

On 2/16/2024 at 12:19 PM, BechMeister said:

Okay thx.

I only have one docking port though. Thats the one on the nose of the capsule

I was trying to say its probably the same mechanism. engine is behind the heat shield but somehow not protected as its just behind it not connected. 
An less aggressive reentry profile might save you, say a 100 m/s reentry burn and you don't need heat shield for engines at all. 
it looks like you burned at least 400 m/s. 
Downside is that this is much less accurate but it will probably save your mission. 

As I understand having Pe at say 25 km also require an heat shield 

[BechMeister]

37 minutes ago, magnemoe said:

As I understand having Pe at say 25 km also require an heat shield 

Ah yes... for some reason my VAB wont tell me anything, just say 0 to everything.. so I have gotten the habit of testing vehicles with the cheat tool now.. To see what Δv levels I have on the different stages.. So.. thats why the angle is extreme. 

I tried to "simulate" coming directly from Kerbin to Duna. I just wanted to see if it could handle the worst? if that makes sense.

But im only going to do my second tour to Duna now.. doing it efficient is a lot harder than I thought it would be

Edited February 17, 2024 by BechMeister

[magnemoe]

47 minutes ago, BechMeister said:

Ah yes... for some reason my VAB wont tell me anything, just say 0 to everything.. so I have gotten the habit of testing vehicles with the cheat tool now.. To see what Δv levels I have on the different stages.. So.. thats why the angle is extreme. 

I tried to "simulate" coming directly from Kerbin to Duna. I just wanted to see if it could handle the worst? if that makes sense.

But im only going to do my second tour to Duna now.. doing it efficient is a lot harder than I thought it would be

You can compensate for the inaccuracy with an rover. Or making the lander an rover. Both seen here. 

About overheating, the large rover behaves well, now I had an issue with the probe core being on the bottom of one of the tanks so it blew up but engine and wheels got no heating. 
And the probe core blowing up caused me to have no direct control. I could still open the parachutes and K2-D2 helped me slow down before touchdown. 
But no brakes and I ended up doing an car chase on Duna. 
Then drove to the monument for radiation science before returning to orbit.

My first lander was a lot like your but only used the twitch engines, but did not have the large landing legs so used grinders who generated a lot of drag. 

[BechMeister]

10 minutes ago, magnemoe said:

My first lander was a lot like your but only used the twitch engines, but did not have the large landing legs so used grinders who generated a lot of drag. 

The legs were because I anticiapte that I might land on a uneven surface, and I dont want it to tumble over x)

But anyway.. that rover chase sounds like something worthy of Mad Max xD

We'll see.. first things first. I am going to make a lot of smaller missions before sending Kerbals to Duna - Im doing the Duna Mastery Challenge atm

[magnemoe]

5 minutes ago, BechMeister said:

The legs were because I anticiapte that I might land on a uneven surface, and I dont want it to tumble over x)

But anyway.. that rover chase sounds like something worthy of Mad Max xD

We'll see.. first things first. I am going to make a lot of smaller missions before sending Kerbals to Duna - Im doing the Duna Mastery Challenge atm

Yes that is why I wanted the grinders, I also wanted the lander to be reusable, using wings for landing legs might work, the could also give some cross range  

Look over at That I did in KSP 2 today for more images of the chase
And it was not that dramatic, more like local news, truck driver stops runaway car.