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Search: Posts Made By: Umran
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Forum: Gas Engines
02-15-2012, 12:19 PM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Yes Pe,
I just pave the way so that user can use it as per their requirements. But do not forget, alpha is actual angle of attack i.e. it itself is a function of induce velocity in axial and...
Forum: Gas Engines
02-11-2012, 11:54 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Pe,
The provided spreadsheet is an example of how to use the solution method drafted by me for my thesis work.

Let us discuss it in detail a bit more.
BEM method was the integration of Blade...
Forum: Gas Engines
02-05-2012, 09:13 PM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

No problem Pe... I will get the data slowly....


To all.
Another main use of this estimator is the power required readings. For example, running a 23 x 8 - 2 bladed prop at 7000rpm will...
Forum: Gas Engines
02-03-2012, 12:33 PM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Dear Antique,
I believe your are referring to this statement below from the file produced by ROSSI,

"The maximum possible speed (in miles per hour) of a propeller-driven airplane equals the
...
Forum: Gas Engines
02-03-2012, 11:55 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Dear Pe,
What i can offer is, since you have large variety of prop brand selection, you feed me the sectional chord lengths. For example,

Prop Brand Base Dimension HUB diameter sta...
Forum: Gas Engines
02-03-2012, 11:24 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Dear jaka,
Radio Control hobby is vast. Those involved in this hobby come from all walks of life. Some are millionaires and some are just making enough for living. For those who can afford there...
Forum: Gas Engines
02-02-2012, 06:13 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

Dear Pe,
We'll discuss further on that.

Yesterday's file that i uploaded, by changing the cell for inputs i missed out the pitch speed calculation... sorry... anyway it has been corrected.
...
Forum: Gas Engines
02-01-2012, 11:26 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

First, congrates for the success in installing the required add-in for excel to operate the solver function.

About the aircraft drag, it has nothing to do with actual thrust available from the...
Forum: Gas Engines
01-30-2012, 03:10 PM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

XLSM file extension is an Excel Macro-Enabled Workbook file. Therefore you may need to enable the macro to be run on this particular spreadsheet.

If you have 2003 or below excel, you may...
01-30-2012, 03:28 AM
Replies: 51
Views: 96,233
Posted By Umran

RE: Propeller Thrust Calculator

Guys...
To those who are interested in predicting actual thrust of a prop kindly browse this thread....

http://www.rcuniverse.com/forum/m_10933735/tm.htm

Well.... i should post it...
Forum: Gas Engines
01-30-2012, 02:53 AM
Replies: 31
Views: 9,759
Posted By Umran

RE: Propeller Thrust Estimator

The actual forward speed can be measured via a radar gun or some other measurement tool... just for info 1 mile/hr = 17.6 inches/sec

The question about the tip chord, that is a good one....

...
Forum: Gas Engines
01-29-2012, 10:31 AM
Replies: 31
Views: 9,759
Posted By Umran

Propeller Thrust Estimator

Dear All,
First i would like to thank one of the forumer here who open this thread, http://www.rcuniverse.com/forum/m_10887453/anchors_10907244/mpage_1/key_/anchor/tm.htm#10907244
Because of the...
Forum: Gas Engines
01-09-2012, 09:57 AM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Noted the support... we are still testing the engine....
Forum: Gas Engines
01-09-2012, 09:52 AM
Replies: 23
Views: 2,900
Posted By Umran

RE: Varible pitch prop development

Okay here is my contribution.....

All are aluminum except for bolts, springs and bearings. How it work, i think you can figure it out via these drawings... The blade leaf is not included as it...
Forum: Gas Engines
01-06-2012, 04:22 PM
Replies: 23
Views: 2,900
Posted By Umran

RE: Varible pitch prop development

As per your initial post, the last sentence grabbed my attention, "No electronics or special through the propshaft tunnels would be needed". To my knowledge this has not been done yet to any RC...
Forum: Gas Engines
01-06-2012, 03:54 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Thanks.
Forum: Gas Engines
01-06-2012, 03:51 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Thanks for the offer...
Forum: Gas Engines
01-02-2012, 11:05 PM
Replies: 23
Views: 2,900
Posted By Umran

RE: Varible pitch prop development

A very good idea... and a very interesting challenge... will think of something....
Forum: Gas Engines
01-02-2012, 10:54 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Hehehe... good idea.... but one needs to eat also.... models won't guarantee that... hehehehe....
Forum: Gas Engines
01-02-2012, 10:51 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Will look at it... thanks.
Forum: Gas Engines
01-01-2012, 11:48 AM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Dear All....
Finally this engine made it to air.....

Thanks to Mr. James from Miri who is willing to install it on his brand new Katana S for further testing.

Refer below video...

...
Forum: Gas Engines
12-14-2011, 07:38 PM
Replies: 66
Views: 26,412
Posted By Umran

RE: DLE 111cc Auto Start System

Dear Rick,
DA50 or DA60 is a single cylinder with hanging crankshaft. The interface for the starting system to the engine itself is very difficult to achieve. I've done it, but it requires a full...
Forum: Gas Engines
10-21-2011, 06:44 AM
Replies: 4
Views: 1,253
Posted By Umran

RE: DLE170cc Autostart System

It can be done with relative ease.
Forum: Gas Engines
09-22-2011, 11:13 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

Yes sir, 12 to 14V. Li-Ion is very good, however it is slightly on heavy side for the amount of capacity it can carry. At this moment i'm thinking of this start system battery to act as ignition...
Forum: Gas Engines
09-22-2011, 11:04 PM
Replies: 37
Views: 3,525
Posted By Umran

RE: RS55cc

The top end, at this moment for this prototype, we use the most common 55cc jug not DLE though. Perhaps later when it enter full productions, we are looking into getting it locally produced. The...
Showing results 1 to 25 of 105
 


 
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