VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 09-29-2018, 09:22 AM
NorthernRV4's Avatar
NorthernRV4 NorthernRV4 is offline
 
Join Date: Mar 2013
Location: Prince Edward Island, Canada
Posts: 124
Default Engine Option

I've really been trying NOT to think much about the engine I will use for my -4 because it's a ways off before I need it. I've had an idea of what I will likely use but still open to options. This morning I came across an ad on Barnstormers for an engine/CS prop very close to home and it seems like a potentially good buy. Looking for some opinions/direct experience from the community on this.

Lycoming IO-320 E1A
Hartzell prop HC-C2YL-4BF

both from a Decathlon. Condition aside, I have a few questions about the suitability for my -4

Fuel Injected: a plus since I plan to build it for inverted flight.
Dynafocal 1 mount
Induction: I'm told it's Horizontal induction, I know this affects the lower cowl/intake and FAB setup. Any potential problems here?

No idea on the suitability of the prop, wondering if there's any issues due to differences in speed range of a Decathlon compared to a -4... Being CS does the blade profile make a big difference for an RV application? Any advice here?
__________________
2017 VAF dues happily paid, Thanks DR!
Reply With Quote
  #2  
Old 09-29-2018, 10:41 AM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 400
Default

Engine wise, biggest consideration is that the horiz induction should face forward, if it doesn't, you will have to change out oil pan etc. Air cleaner considerations are minor overall in the long run.

Go to Hartzell website to get full specs for the prop, your concerns would be diameter limitations & desired pitch range. By comparing the recommended prop choices on Vans site and the specs of this prop, you will be able to determine if you could live with these pitch settings (speed range).
You listed the prop hub part number, you would have to get the rest of the assembly numbers (blade series#) to determine what performance you would get out of this prop. The '4BF' designates this being a 'non-feathering, counterweights, governor oil pressure decreases pitch' prop, be sure to get the govenor with the prop as it is probably specific to it's application. The counterweights will probably affect the prop spinner & require cutouts to fit.
__________________
Ralph
Maintain lots, upgraded & repaired some, modified more, rebuild a few, & built 4 of 'em
Reply With Quote
  #3  
Old 09-29-2018, 11:45 AM
smokyray's Avatar
smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,734
Default Four Power!

Quote:
Originally Posted by NorthernRV4 View Post
I've really been trying NOT to think much about the engine I will use for my -4 because it's a ways off before I need it. I've had an idea of what I will likely use but still open to options. This morning I came across an ad on Barnstormers for an engine/CS prop very close to home and it seems like a potentially good buy. Looking for some opinions/direct experience from the community on this.

Lycoming IO-320 E1A
Hartzell prop HC-C2YL-4BF

both from a Decathlon. Condition aside, I have a few questions about the suitability for my -4

Fuel Injected: a plus since I plan to build it for inverted flight.
Dynafocal 1 mount
Induction: I'm told it's Horizontal induction, I know this affects the lower cowl/intake and FAB setup. Any potential problems here?

No idea on the suitability of the prop, wondering if there's any issues due to differences in speed range of a Decathlon compared to a -4... Being CS does the blade profile make a big difference for an RV application? Any advice here?
Jim,
I built my RV4 25 years ago when there was much more FWF Experimentation taking place than now. I've seen numerous plug and play FWF from certified airplanes that worked well and saved money.
Your engine prop combo has been literally bolted onto an RV4 with no mods by a friend of mine and it worked very well. The Citabria/Decathlon lower cowling utilizes a forward facing induction with the foam filter element mounted in the lower cowling. It's internally plumbed with a 3" SCAT connecting it from the cowling to the Bendix Fuel Injector Induction Servo mounted on the lower sump. Van's sells a FAB option just for that setup. Make sure the seller includes the full Christen inverted system, boost pump and assorted hardware. As far as the prop, the blade shape on that model is optimized for the Decathlon's lower entry aerobatic speed range, but will still provide excellent top end speed. Get as many parts from the Decathlon as you can, every thing you include saves $$$ and could be potentially sold to fund your project.

I think the Decathlon FWF would be a great option.

V/R
Smokey

PS:Many builders have also retrofitted the Engine/Prop of the Mooney M20 series as well as the Twin Comanche's IO-320B1E with the unique Type-1 Dynafocal mount. Van's sells both type 1 and 2 mounts for that very reason.
My current RV6'X" sports an 0-360J2A salvaged from a Robinson R22 that is light, powerful and saved $$$.
My RV4's early 0-320A (Dash Nothing) came from an Apache I salvaged. I sold the props to fund my project and utilizing a Sterba wood prop saved weight and cost. Selling the Apache's feathering Hartzell props paid for my panel and finishing kit. The engine gave me 1000 hours with just minor maintenance required.

Last edited by smokyray : 09-29-2018 at 11:58 AM.
Reply With Quote
  #4  
Old 09-30-2018, 05:43 AM
NorthernRV4's Avatar
NorthernRV4 NorthernRV4 is offline
 
Join Date: Mar 2013
Location: Prince Edward Island, Canada
Posts: 124
Default

Thanks for the great info all, sorry for the double post, let's move this discussion to the other thread. :-)
__________________
2017 VAF dues happily paid, Thanks DR!

Last edited by NorthernRV4 : 09-30-2018 at 05:47 AM.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 05:16 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.