Unanswered Questions
38 questions with no upvoted or accepted answers
4
votes
0
answers
72
views
Are there any low-fidelity tools to do propeller analysis in crosswind condition?
So far, I have been using XROTOR to do analysis for propellers in static and axial velocity conditions which works great. Now, I want to do the same calculations in crosswind condition and want to ...
3
votes
0
answers
163
views
For small pistons (C150, C172, Bonanza, etc...), what is a typical range of swirl angles?
For classic piston planes, what is the typical range of swirl angles for the propwash?
I realize this changes in cruise vs. climb, and based on the prop, so extra kudos for an answer with the ...
- 6,215
3
votes
1
answer
368
views
What is the aerodynamic influence of prop spacing and placement in multi-prop engine setups
I saw this question Is there a rule of thumb for spacing between jet engines?, which referred to How do you choose engine placement for under wings engines?, but I was wondering how the engine spacing ...
- 21
2
votes
0
answers
133
views
Has a carbon fiber propeller ever broke with a bird strike?
Curious if a carbon fiber prop has broken(or considerably deformed) with a bird strike. Or maybe by something else other than an impact with the ground/crash.
- 8,513
2
votes
0
answers
67
views
Is there a convention of propeller tip separation from the wind tunnel walls?
Blockage ratio is commonly used to address the effect of confinement on the propeller's performance tested inside a closed test section of a wind tunnel. In most cases, blockage corrections (like ...
- 4,487
2
votes
0
answers
182
views
How does a partially covered air intake affect the thrust of a propeller ?
does a partially covered air intake of a ducted propeller significantly affect its thrust?
If so, will it be like 10 or rather 90 percent less thrust ?
Thanks for your answers!
Simon
- 361
2
votes
0
answers
428
views
What calculations are needed for counter-weight balancing on a propeller?
I am designing a small-scale propeller and i have managed to design on optimized geometry for the blade. However the blade pitch angle adjusts according to different flow speeds so i need to mount ...
- 77
2
votes
0
answers
392
views
What Inertial effects should be considered to achieve blade stability on a Variable Pitch Propeller tailoredby aerodynamic loads?
I am developing a self adjusting variable pitch propeller tailored by its pitching moments due to aerodynamic loads setting the blade rotation axis in an offset from the aerodynamic center as shown ...
- 77
2
votes
0
answers
310
views
What is the history of this specific Cessna propeller (s/n F2430)?
Hoping someone can help... I'm looking to get some information about a Cessna plane propeller my Fiancé recently bought. It's his birthday coming up and it would be great to have any sort of history, ...
- 85.7k
1
vote
2
answers
334
views
Propeller shaft vs aerodynamics torques
Does the airframe of a single propeller (with varying RPM) airplane react (Newton's third law) to propeller shaft torque or propeller aerodynamic torque ?
From a propeller point of view, what is the ...
CommunityBot
- 1
1
vote
0
answers
97
views
Could a WW2-era Grumman Hellcat land on a Saipan-class light carrier using only reverse-thrust generated by a reverse-pitch propeller?
Just that - take away an F6F's arrestor hook and fit it with a reverse-pitch-capable propeller (and, of course, all the other odds-and-ends to make such a system work).
Would it be possible for a ...
1
vote
0
answers
110
views
How to retrieve the thrust distribution over a blade using XROTOR?
What is the procedure for retrieving the thrust distribution over a propeller blade using XROTOR? I need the sectional (i.e., for each station) thrust coefficient values.
I was only able to retrieve ...
- 6,527
1
vote
0
answers
156
views
Would the dle 55ra engine be enough to power my paramotor(ducted fan)?
I plan on using the dle 55ra engine to produce 5hp at 8,500 rpm. I am using it in a paramotor, and to save space I am considering using a ducted propeller similar to the Fulcrum power pod. The duct ...
- 137
1
vote
0
answers
209
views
Why have supercritical airfoils not been used in designing the propeller blades?
In terms of specific fuel consumption, propellers are more economic than jet engines at low speeds (<0.5 Mach) but at high speeds, the propeller blade tip reaches locally to supersonic speeds which ...
1
vote
0
answers
178
views
How reliable are the available airfoil data sources?
I am making calculations based on Blade Element (Momentum) theory (BEM) for propellers and I am trying to find the angle of attack at which the propeller performs most efficiently.
If I have ...
- 75