Engine performance chart - electronic

[carusoam]

Can anyone recommend a method for calculating / setting %hp using an iPad or other smartphone type app?

Altitude, Rpm, %bhp, adjusted for temp difference from std day, with approximate FF...

I am still using a laminated copy of my POH chart and interpolating old school style.

There's got to be a better way to plug in the number and chug out an answer.

 

Best regards,

 

-a-

[xftrplt]

Search the Apps for "Aircraft Power."  You'll find two, one was panned in the reviews.  

[jetdriven]

If running LOP, add 2" of MP from the book power settings and set power with FF. 

[danb35]

If running LOP, just set power with fuel flow, and ignore MP/RPM (within reason).

[carusoam]

Dick,

Thanks I'll take another look.  I bought one, but did not quite get what I expected...

I still use ROP and the POH data on some flights.

 

DanB, (or anyone else)

Any idea where i can look up the proper bhp% factor to multiply by FF?

The Lycoming numbers for a particular compression ratio have been given several times.  I have an IO550.  

I have calculated this factor using POH data.  I would like to compare notes.

Best regards,

-a-

[danb35]

The multiplier depends on your compression ratio--for 8.5:1, I believe it's either 14.7 or 14.9.  I know I've seen a reference posted, but I don't recall where.  Lyc vs. Conti doesn't matter.

[cunnira]

I bought the Power Wheel App but it doesn't come up with the same numbers as the POH.

[carusoam]

The other one is IO-360 Power Calculator  from Air Dave, LLC.

It is free and covers -a, -c, -d, -j and -k engine groups.  Would be nice to know how accurate the free one is?

Sounds interesting, but does not cover my IO-550G needs.  I sent Air Dave a request, but have not heard back....

Does anyone know Air Dave?  i will share POH power chart data.  I have it typed into an excel spreadsheet already....

Best regards,

-a-

[carusoam]

DanB,

Comparing the numbers you gave above to my POH 14.7 or 14.9....

15 works just as well....65% power at 12gph = 180 hp  (roughly 12 X 15).

[carusoam]

New Question on the same topic.....

LOP (or peak) @ 65%bhp but compared to what? 

My engine max output is 280 bhp (at 2,500rpm) .  It is detuned from much higher possibilities.

The O3 engine max output is 310 bhp (2700 rpm)

Is my O1 red box the same as the O3?   

65% for the O1 is 180hp  (180/280) ...from my POH and supported by using 15gph X FF...

65% for the O3 is 201 (201/310)  ....Supposing here...

Can I use the same 201hp and safely stay outside the red box?  Has my math gotten fuzzy?

Best regards,

-a-

[Shadrach]

Quote: carusoam

Dick,

Thanks I'll take another look.  I bought one, but did not quite get what I expected...

I still use ROP and the POH data on some flights.

 

DanB, (or anyone else)

Any idea where i can look up the proper bhp% factor to multiply by FF?

The Lycoming numbers for a particular compression ratio have been given several times.  I have an IO550.  

I have calculated this factor using POH data.  I would like to compare notes.

Best regards,

-a-

[Shadrach]

Quote: Shadrach

Sent you a PM...

[carusoam]

Thanks Ross, got it.

[Shadrach]

Quote: carusoam

New Question on the same topic.....

LOP (or peak) @ 65%bhp but compared to what? 

My engine max output is 280 bhp (at 2,500rpm) .  It is detuned from much higher possibilities.

The O3 engine max output is 310 bhp (2700 rpm)

Is my O1 red box the same as the O3?   

65% for the O1 is 180hp  (180/280) ...from my POH and supported by using 15gph X FF...

65% for the O3 is 201 (201/310)  ....Supposing here...

Can I use the same 201hp and safely stay outside the red box?  Has my math gotten fuzzy?

Best regards,

-a-

[carusoam]

Compression ratio for the IO550G

8.5:1

Not so surprised.....

Best regards,

-a-