VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-6/6A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #41  
Old 05-31-2018, 11:22 PM
Plumbmaster's Avatar
Plumbmaster Plumbmaster is offline
 
Join Date: Aug 2017
Location: Concord, CA
Posts: 31
Smile Ground Roll And Climb Out RPM

Sounds pretty much like a cruise prop to me. Thing is and correct me if I'm wrong, you can re-pitch the prop to get a higher rpm on take off. Around these parts of the woods that's around $1200. Or you can get a Cato prop which seems to act like a variable pitch prop-high rpm on take off followed by cruise speeds in the 150 knot range. They're reasonably affordable at @ $3000.
High compression pistons will help generate more power with your prop as is.
It. all. costs. money.
Reply With Quote
  #42  
Old 06-01-2018, 01:34 AM
jpowell13 jpowell13 is offline
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 579
Default Just switched my FP Sensi for the GA Sensi

I've been making annual June trips from Baton Rouge to AZ for the past 4 years. My plane is a 6A with a 160 hp 0320 that weighs about 1,030 lbs empty. Because of the high density altitudes in June I decided to make some changes to improve performance.

First I added Anti-splat, Lip-skid and cowl flap to add a little weight to the nose and improve cooling and safety. Then, I removed my aluminum FP Sensi and replaced it with the Composite GA Sensi. I set the pitch with the recommended number 4 gage (standard pitch). After ground testing and three short flights, here are my impressions and measurements.

1. The composite prop and hub weigh about 13.5 lbs less than the alum. prop.
2. Static RPM with the FP: 2170 rpm. With the GA prop: 2300+ rpm.
3. Initial acceleration feels much quicker.
4. I saw 1500 fpm initial climb rates and sustained rates of 1000 fpm on 90
degree day at sea level. This was with about 20 gal of gas and 250 lbs of
pilot and other stuff in the cabin. That's at least 300 fpm better than with
with the fixed prop.
5. I'm not sure about the difference in take-off run. But, I believe it's at
least 200' shorter with the new prop.
6. My top speed with both props at about 2000' is about 145 kts. This seems
to be due to the fact that I can run the new prop at 2700 rpm rather
than being limited to 2600 rpm.
7. Too soon to tell what my fuel burn will be, but it looks like I'll be running
at about 7 gph rather than 6.5+/- gph that I was getting down low with
the cruise prop.

The new prop and spinner cost me about $4000. I was able to use my old prop extension with the new prop. That's a lot of money, but much less cost and complexity than with a control pitch prop. So far, I'm very happy. And anxious to see how the upgrades work in AZ.

John
Reply With Quote
  #43  
Old 06-13-2018, 10:50 PM
jpowell13 jpowell13 is offline
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 579
Default More Insights on Sensi GA prop

After reviewing W&B data my 6A went from 1033 lbs to 1026 lbs.

And, the CG moved from 69.3" to 70" aft of datum...

After adding Anti-splat II, Lip-Skid, Cowl Flap and changing from Sensi FP to GA prop.

The CG difference still allows for plenty of baggage and reasonably heavy PAX.

Still very pleased with improved climb and takeoff acceleration.

I experimented with a partial flap take off today. With the old prop, there was little difference between no flap and partial flap takeoffs. Taking off with partial flaps now seems to result in a noticeably shorter take off. I believe this is due to the engine getting into the best area of the power curve sooner with new prop.

John
Reply With Quote
  #44  
Old 06-17-2018, 12:09 PM
Turbo69bird Turbo69bird is offline
 
Join Date: Jun 2013
Location: CT
Posts: 181
Default

BTW my prop is a 70cm6s16-0-79 sensenich metal prop 2600 max rpm range.

That’s assuming no one made any changes to it without stamping anything into it. Which sadly from what I’m told happenes quite often
__________________
Proud owner of 925RV
Special Thanks to Fred Stucklen


While I'm not a builder if I happen to give advice , I will not be responsible for damage to equipment, your ego, parts, world wide power outages, spontaneously generated black holes, planetary disruptions, or personal injury that may result from the use of this advice.

Last edited by Turbo69bird : 06-17-2018 at 12:12 PM.
Reply With Quote
  #45  
Old 06-17-2018, 12:13 PM
Turbo69bird Turbo69bird is offline
 
Join Date: Jun 2013
Location: CT
Posts: 181
Default

Quote:
Originally Posted by jpowell13 View Post
After reviewing W&B data my 6A went from 1033 lbs to 1026 lbs.

And, the CG moved from 69.3" to 70" aft of datum...

After adding Anti-splat II, Lip-Skid, Cowl Flap and changing from Sensi FP to GA prop.

The CG difference still allows for plenty of baggage and reasonably heavy PAX.

Still very pleased with improved climb and takeoff acceleration.

I experimented with a partial flap take off today. With the old prop, there was little difference between no flap and partial flap takeoffs. Taking off with partial flaps now seems to result in a noticeably shorter take off. I believe this is due to the engine getting into the best area of the power curve sooner with new prop.

John
This is great info because an aft CG is one of my concernes with a prop change, kind of hard to shed any weight out back.
__________________
Proud owner of 925RV
Special Thanks to Fred Stucklen


While I'm not a builder if I happen to give advice , I will not be responsible for damage to equipment, your ego, parts, world wide power outages, spontaneously generated black holes, planetary disruptions, or personal injury that may result from the use of this advice.
Reply With Quote
  #46  
Old 06-17-2018, 06:25 PM
jpowell13 jpowell13 is offline
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 579
Default Clarification

Turbo, the GA prop is about 13.5 pounds lighter. I offset about half of that weight difference by adding the Antisplat items keeping the CG shift small.

Took off from Gallup NM this afternoon. Performance was way better than when I took off from that airport at the same time last year with the old prop. The density altitude was about 2000' higher last year, but the prop made takeoff and climbout much less of a nail biter.
John

Last edited by jpowell13 : 06-17-2018 at 06:32 PM.
Reply With Quote
  #47  
Old 06-18-2018, 07:54 AM
Block Block is offline
 
Join Date: Dec 2016
Location: Plymouth ct
Posts: 12
Default

jeff.i have a catto 3 blade climb prop on my 160hp 6 now you can try if you want,i picked up a whirlwind 200ga I am going to try in a couple weeks
Reply With Quote
  #48  
Old 07-19-2018, 07:14 PM
Turbo69bird Turbo69bird is offline
 
Join Date: Jun 2013
Location: CT
Posts: 181
Default

Hey Howard nice to see you here.

Id love to try that prop


My static with my prop has been 2170 the last three trips. And the last empty weight in my log books is 1096 lbs and I did the wrap since then so add approx 15 lbs to that weight.

Still trying to get my hands on scales to weight this thing.
__________________
Proud owner of 925RV
Special Thanks to Fred Stucklen


While I'm not a builder if I happen to give advice , I will not be responsible for damage to equipment, your ego, parts, world wide power outages, spontaneously generated black holes, planetary disruptions, or personal injury that may result from the use of this advice.
Reply With Quote
  #49  
Old 08-25-2018, 01:42 PM
Turbo69bird Turbo69bird is offline
 
Join Date: Jun 2013
Location: CT
Posts: 181
Default

Empty weight just scaled is 1134! A bit heavier than I expected.
__________________
Proud owner of 925RV
Special Thanks to Fred Stucklen


While I'm not a builder if I happen to give advice , I will not be responsible for damage to equipment, your ego, parts, world wide power outages, spontaneously generated black holes, planetary disruptions, or personal injury that may result from the use of this advice.
Reply With Quote
  #50  
Old 09-25-2018, 06:40 PM
N333M's Avatar
N333M N333M is offline
 
Join Date: Apr 2017
Location: central Il
Posts: 57
Default WW ga report

Block, cant wait to hear about how that Whirlwind performs!
__________________
D. Gherardini
Central Illinois
RV9A slider 0-320 carbed
Kitfox IV (SOLD)
Luscombe 8A (SOLD)
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 02:39 PM.


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.