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  #1  
Old 05-14-2022, 09:10 AM
lipper03 lipper03 is offline
 
Join Date: Sep 2021
Location: Fulshear, TX
Posts: 81
Default 14A Thunderbolt 390-EXP119 prop?

Looking for prop advise on my 14A, just ordered a Thunderbolt YIO-390-EXP119. I'm confused with my options on Van's site, would like a 3 blade, just because I think they look good. Thoughts or suggestions? Posting on Facebook as well. Thanks!
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Brian

RV-14A
Build Started 12/31/21-
Section 6 complete 1/30/22
Section 7 complete 3/27/22
*Emp Ordered 9/27/21- Delivered 6/30/22
*QB Fuselage Ordered 11/3/21- Est 1Q23
*QB Wings Ordered 2/18/22- Est 2Q23
*YIO-390-EXP119 Engine Ordered 5/14/22- Est 2Q24
https://eaabuilderslog.org/?s=RV14A2021

PA-28-236 N419SB
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  #2  
Old 05-14-2022, 11:08 AM
MED MED is offline
 
Join Date: Jul 2015
Location: Aiken, SC
Posts: 906
Default

Something to consider - 3 blades are pretty, but considerably complicate cowling removal. YMMV
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MED
140236
N435MD
Miss March 2020
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  #3  
Old 05-14-2022, 11:12 AM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,671
Default

Just installed this MTV-9 recently, love it.

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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags, MTV-9 prop
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #4  
Old 05-14-2022, 11:47 AM
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BOHICA BOHICA is offline
 
Join Date: Oct 2020
Location: Austin
Posts: 135
Default

I was going to go with the three bladed prop but with talking with the mothership you lose 25lbs of carrying capacity in the cargo area. They look great and reduce noise at twice the cost and loss of capacity due to CG shift because they are so light.

I kept my money and my cargo.

Read form Harzell comparison of 2 vs 3.

https://hartzellprop.com/are-more-pr...he%20fuselage.
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Rick
2021 Donation Made
RV-14A 140892 building N914RS
QB expected Arrival Sep '22- Jan '23
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  #5  
Old 05-14-2022, 02:29 PM
lipper03 lipper03 is offline
 
Join Date: Sep 2021
Location: Fulshear, TX
Posts: 81
Default

Quote:
Originally Posted by BOHICA View Post
I was going to go with the three bladed prop but with talking with the mothership you lose 25lbs of carrying capacity in the cargo area. They look great and reduce noise at twice the cost and loss of capacity due to CG shift because they are so light.

I kept my money and my cargo.

Read form Harzell comparison of 2 vs 3.

https://hartzellprop.com/are-more-pr...he%20fuselage.
Which two blade did you go with?
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Brian

RV-14A
Build Started 12/31/21-
Section 6 complete 1/30/22
Section 7 complete 3/27/22
*Emp Ordered 9/27/21- Delivered 6/30/22
*QB Fuselage Ordered 11/3/21- Est 1Q23
*QB Wings Ordered 2/18/22- Est 2Q23
*YIO-390-EXP119 Engine Ordered 5/14/22- Est 2Q24
https://eaabuilderslog.org/?s=RV14A2021

PA-28-236 N419SB
KIWS

VAF donation 2021/22

CAF Member
EAA Member
AOPA Member
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  #6  
Old 05-14-2022, 03:22 PM
dmattmul dmattmul is offline
 
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 312
Default 3 blade

I went with Whirlwind 3 blade, CG is within the specified range with full baggage in the calculations. It does fall out of the allowable range for aerobatics but who does those with full baggage? (100 lbs.) Added a back-up alternator helps and the new 390EXP I believe is heavier than my 390. I even have 2 Earth-X batteries on the firewall which weight less than one standard battery. My WW 3 blade was not that much more than the Hartzell 2 blade and performs every bit as good if not better. Very smooth and quiet. W&B depends on a lot more factors than weight of your prop. I have checked my W&B twice on separate scales and intend to check again when it come back after paint. Also cowling removal is a no-brainer using the Anti-Splat fairing protector. Just slides down the protector. Vans put a 360 in one of their 14's and it's ~ 19 lbs. lighter than the 390. I'm assuming the 14 might be less tolerant to a lighter front end but that is just a guess. I'm surprised Van's would state this data without knowing the complete facts.
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RV-14A QB building, Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, EarthX batteries, Parts became a real airplane 8/15/2020.
Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade, EarthX batteries, real airplane hopefully early 2024. Paid subscriber and more. (Worth every dollar contributed).
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  #7  
Old 05-14-2022, 04:15 PM
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Jpm757 Jpm757 is offline
 
Join Date: May 2013
Location: Sherman, CT
Posts: 1,048
Default

I find no more difficulty removing the cowling whether a 2 or 3 blade prop. It is not the propeller blades that get in the way, but rather the rear bulkhead on the spinner. Plenty of 2 blade RV's running around with scratched spinners and cowlings because of hastily installed/removed cowlings.
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RV6 #20477 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017
(KOXC)Oxford, CT, (0NY0)North Creek, NY.
1941 J3 Cub skis, floats.
Current Project Javron Super Cub
Thank You Doug!
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  #8  
Old 05-15-2022, 12:25 PM
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jeffw@sc47 jeffw@sc47 is offline
 
Join Date: Aug 2014
Location: Simpsonville, SC (SC47)
Posts: 424
Default I had the same 'I-wanna'

I also wanted to get the 3-blade Hartzell. They look terrific!

At SnF I talked to Hatzell engineer and Sean Tucker and a few other persons.

Caveat - This is accessing my cranial data-bank as best I can.

Harzell engineer said that the engine+propeller operate as a system and that is how it should be evaluated. The lighter 3-blade composite propeller doesn't absorb the vibration and harmonics created in the engine as well as the heavier metal prop does, which has been how the system has been designed for quite a few years prior to the 3-blade composite entering the field. Hatzell testing found that rotating engine components (crank shaft, cam shaft, and the gearing in the back-side accessory case suffered fatigue and showed signs of developing failure.

Sean Tucker asked me, when I posed the question of which propeller should I consider, "Do you plan to do regular competition aerobatics?" He said that if I wanted to regularly execute full power straight up maneuvers I should go for the 3-blade composite, that is what it did best. BTW, I have heard more than one report that he disassembles his show plane completely every year (engine and airframe) to do a thorough inspection. Plus the 3-blade composite was just under double the price of the metal 2-blade, plus the spinner was $1,400 - 4 years ago. I am very pleased with the 2-blade metal, 74" diam, constant-speed, HC-C2YR-1BFP/F7497 PROP.
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Jeff Warren
Simpsonville, SC (@SC47 > 10nm NW Triple Tree)
RV14A (N14ZT), Ser#140195
FF 11/24/21; Phs 1 completed
Contribution made 12/9/21 (USArmy 2/67-2/70)
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  #9  
Old 05-15-2022, 03:58 PM
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 419
Default

Quote:
Originally Posted by jeffw@sc47 View Post
BTW, I have heard more than one report that he disassembles his show plane completely every year (engine and airframe) to do a thorough inspection.
His team posted a time-lapse video several years ago showing them disassembling and reassembling his biplane for one of it's yearly teardowns. Cool vid, but can't find it now.
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RV-8
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Last edited by RV8JD : 05-15-2022 at 04:43 PM.
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  #10  
Old 05-15-2022, 07:47 PM
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czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 398
Default

Quote:
Originally Posted by dmattmul View Post
I went with Whirlwind 3 blade, CG is within the specified range with full baggage in the calculations. <snip> I have checked my W&B twice on separate scales and intend to check again when it come back after paint.
Paint will move the empty CG aft, and burning fuel also moves the CG aft. I haven't seen a W&B spreadsheet for a painted RV-14A with a composite prop that is still within the aft CG limit when you have 100 lbs of baggage, two adults, and have burned fuel down to ~8-10 gal. Would be interested in seeing your final numbers once you get it back from paint.
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Mark Navratil
Spring Hill, KS
RV-8A #80583 - built/flew/sold
RV-14A #140017 - wings/empennage/tailcone complete, fuselage in progress...

My postings on this site are my own and do not necessarily reflect the views of my employer.
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