Mon Apr 27, 2009 1:21 pm
Both the DA2 and DA4 work with 100LL, but are restricted to 2950HP on takeoff.
Mon Apr 27, 2009 1:53 pm
She's beautiful!! 
Mon Apr 27, 2009 5:24 pm
Words can't compliment this sexy bird!!!!!!!!!!!!What would be cool is to see a set of before and after pics of this birds restoration....please???
Mon Apr 27, 2009 6:02 pm
Here's their web site:
http://www.historicalflightfoundation.com/
I am really stoked about this project!
Dean the propliner freak!
http://www.historicalflightfoundation.com/
I am really stoked about this project!
Dean the propliner freak!
Mon Apr 27, 2009 9:06 pm
thundergull pilot wrote:The FAA type certificate for a DC-7B list two engine desginations for that aircraft. 972TC18DA2 and 972TC18DA4. Take off horsepower was 3250 @2900 R.P.M. and manifold pressure of 56.5 in. hg. Of course that was on 115/145 octane gasoline. The C model DC-7 lists a 988TC18EA4 engines. I would like some one to publish an index of all the R-3350 engines military and commercial. Regards Carl
Yes that would be nice !!
Dave
Eastern Air Lines DC-7 Update
Mon Apr 27, 2009 11:27 pm
A few dash number Turbo-Compound military engines with direct fuel injection can be modified for use by DC-7's.The R-3350-34 and -42 (Navy)and -91 and-93 (Air Force) from Lockheed C-121's can be modified as per STC's without too much trouble.With 100/130 and (supposedly) 100LL we're allowed 2880 HP.The maximum manifold pressure varies slightly between the dash number engines between 51 and 52" hg where the civilian DA and EA engines allow 53" (sea level and standard day).All use 234 BMEP as a cross limit (use whichever you get to first with manifold pressure or BMEP).This is at 2900 (engine) RPM.The prop turns at roughly half of that speed.
There is also a similar manifold pressure vs. BMEP limit for METO and Climb Power.Meto Power is 212 BMEP or 43.5" manifold pressure and 2600 RPM.We usually end up hitting the manifold pressure limit first in Climb Power (175 BMEP or 36" manifold pressure and 2400 RPM) up to about 3500-4000 ft.After that,the BMEP will be available at a less than 36".I've been told that his has to do with reduced back pressure in the PRT's as the altitude increases.
There is also a similar manifold pressure vs. BMEP limit for METO and Climb Power.Meto Power is 212 BMEP or 43.5" manifold pressure and 2600 RPM.We usually end up hitting the manifold pressure limit first in Climb Power (175 BMEP or 36" manifold pressure and 2400 RPM) up to about 3500-4000 ft.After that,the BMEP will be available at a less than 36".I've been told that his has to do with reduced back pressure in the PRT's as the altitude increases.