Ninja Jump - Monster Dry Slide

3/31/2012
Bureau of Ride and Measurement Standards
PA Department of Agriculture
2301 N. Cameron Street
Harrisburg, PA 17110
Attn: Mr. Joseph Filoromo
RE: Ninja Jump – Monster Dry Slide
Dear Mr. Filoromo,
We have reviewed the Monster Dry Slide Technical Dossier provided by Sawyer, Duncan & Associates. The
“Monster Dry Slide” inflatable is an amusement device manufactured by Ninja Jump of Los Angeles, CA.
Based on our review, we hereby certify that the design of “Monster Dry Slide” inflatable satisfies the wind
load requirements of the 2009 International Building Code as required by the State of Pennsylvania. The
structure also satisfies the requirements of ASTM F-24 in general and ASTM F2291-03, ASTM 2374-04 and
the Pennsylvania Regulations Chapter 139 Pa Code 7, in particular. The ground anchors specified in the
technical dossier are adequate to fully restrain the Inflatable Amusement Device in a 15 mph wind. When
wind speeds are expected to exceed 15 mph, the ride shall be deflated and closed for the duration of the
wind event.
I trust this information is sufficient for your needs at this time. Please do not hesitate to contact our office
should you have any questions.
Regards,
Clark-Reder Engineering, Inc.
Jeffrey M. Reder, P.E.
3/31/12
Attachments: Monster Dry Slide Technical Dossier
Clark-Reder Engineering, Inc 4828 Business Center Way, Cincinnati, OH, 45246 ● Phone (513) 851-1223 ● Fax (513) 297-0934 ●www.clarkreder.com
Pennsylvania Department of Agriculture
Bureau of Ride and Measurement Standards
Ride Approval Checklist
Name and address of the manufacturer of the Ride or Attraction
Ninja Jump
3221 San Fernando Road
Los Angeles, CA 90065
Telephone # (325) 255-5418 (Grace Chavez)
Fax # 323-255-1312
Email- info@ninjajump.com
Web site - http://www.ninjajump.com
Approved Manufacturers name of the Ride – Monster Dry Slide
Pet name of the Ride (if applicable) –
Minimum/Maximum Height Requirement (if applicable) – Max = 72” Min = 42”
Minimum/Maximum Age Requirement (if applicable) – N/A
Minimum/Maximum Weight Requirement (if applicable) – Max weight = 250 lb per
Is this an Inflatable Water Related Ride? YES __ __
NO ___X__
Does it meet the Department of Health guidelines regarding regulated water
attractions: YES __ ____
NO _____ N/A
Name and address of Pennsylvania Licensed Engineer providing certification
Jeffrey M. Reder, P.E.
4828 Business Center Way
Cincinnati, OH 45246
Telephone # (513) 419-9909
Fax # (513) 297-0934
E Mail- jreder@clarkreder.com
First company to register the ride (if applicable) Has the Department received an owner’s manual? –
Has the Department received a photograph of the ride or attraction? Approved name of the ride or attraction – Monster Dry Slide
Notes: Class
MONSTER DRY SLIDE
TECHNICAL DOSSIER
Introduction and Summary
I have examined the design of the “Monster Dry Slide” amusement device manufactured by Ninja Jump
Inc. of Los Angeles, California, USA and have performed wind load calculations.
I hereby certify that the design of Ninja Jump’s “Monster Dry Slide” satisfies the requirements of ASTM
International F-24 Committee Standards in general and ASTM F2291-09b and ASTM 2374-10 in particular.
I also certify that the specified anchors of 6 bottom anchors and 2 upper tethers, 18” stakes are adequate to
fully restrain this Inflatable Amusement Device in a 15 mph wind.
……………………………………………………
Michael J. Viechweg, P.Eng
Sawyer, Duncan & Associates
Monster Dry Sldie Dossier
Description of Ride
This is a 35’ L x 12’6”W x 18’ H rectangular interactive air slide with two individual lanes. The slide is
inflated using one 1- 1.5 HP electric fan.
Patrons enter at the front entrance of the device and use the climbing grips/stairs to reach the top of the
slide. The device has netting at the top to stop diving and the operators can easily supervise the activities of
the patrons and communicate to them.
Specifications of the device are as follows:
1. Dimensions: 35’ L x 12’6”W x 18’ H max ht, 395 lbs.
2. Construction: fibre-reinforced fabric, 15 oz Fire Retardant material certified to NFPA 701
(certificate attached).
3. Two (2) operators are needed to operate this device.
4. Maximum participants: Children only with a maximum of 2 participants. Maximum weight of 250
lbs each and minimum height of 42” and a max 70” tall. Operator to ensure large boisterous
children are not mixed with small timid ones.
Sawyer, Duncan & Associates
Monster Dry Sldie Dossier
5. Anchors: Minimum of 6 anchors. Stakes, if used, are to be a minimum of 18” in length, 5/8”
diameter and driven completely into firm ground, such as grassed areas, or directly into asphalt. 24”
stakes may be used but driven at least 75% (i.e. 18”). Loose soil is unacceptable. A minimum of 50
lb ballast sandbags are acceptable for 15 mph winds. If indoors the upper tethers are not required
and conduit strap anchored using concrete or wood fasteners are acceptable. The manufacturer may
suggest more.
6. Blower: one 1- 1.5 HP, producing min 700 cfm and max 900 cfm @ 5” wg. Typical inflation
pressure for this type of device with sewn (rather than welded) seams is 5” – 7” (26 – 36 psf.) with a
1 HP blower. Blowers shall be fitted with a non-return valve or flap to minimise deflation.
7. Weather restrictions: Maximum wind speed for operation is 15 mph. Calculations are attached.
Compliance
Compliance with ASTM F 1159-03a, section 7.6 is as follows:
a) Flame-out: certificate attached
b) Hold-down is shown in the attached drawings, and is designed for maximum operating wind speeds of 15
mph. Calculations are attached.
c) Concealment: Open structure, operators can monitor entire unit
d) Exit Lighting: Not applicable
e) Deflation: Open device and fast evacuation, operator on duty when patrons are on unit, no increased
risk of injury due to sudden loss of power to blower.
Sawyer, Duncan & Associates
Monster Dry Sldie Dossier
Pattern Name: MONSTER DRY SLIDE-SEWING INSTRACTION
BACK VIEW
MESH
0' 6"
1' 8"
3' 3"
SLIDE
SLIDE
18' 0"
1' 8"
12' 6"
3' 3"
1' 8"
0' 6"
Pattern Name: MONSTER DRY SLIDE-SEWING INSTRACTION
FRONT VIEW
3' 6"
4' 4"
MESH
CLUMB
CLUMB
5' 8"
10' 2"
2' 8"
1' 10"
0' 6"
1' 8"
3' 3"
1' 8"
12' 6"
3' 3"
1' 8"
0' 6"
Pattern Name: MONSTER DRY SLIDE-SEWING INSTRACTION
1' 8"
RIGHT SIDE VIEW
ZIPPER 18"
3' 6"
CLIMB ENGLE 60
O
4' 7"
SLIDE ANGLE 49
O
18' 0"
5' 5"
HIGH LEVEL
ANCHOR POINTS
2 PLACES
10' 2"
4' 6"
BLOWER TUBE
5' 8"
4' 10"
2' 2"
ZIPPER 36"
9' 6"
12' 10"
Pattern Name: MONSTER DRY SLIDE-SEWING INSTRACTION
TOP VIEW
2' 2"
SLIDE
MESH
MESH
FRONT
12' 6"
CLUMB
CLUMB
8' 2"
SLIDE
2' 2"
11' 6"
LOW LEVEL
ANCHOR POINTS
6 PLACES
35' 0"
Sawyer, Duncan
& Associates
Prepared By:
Report No:
Page No: 1
Date:
30-Mar-2012
M. Viechweg, P.Eng.
Subject:
MONSTER DRY SLIDE
Calculate wind loads using the UBC Method 2 - Projected Area
From attached drawing, vertical projected area, Av =
horizontal projected area, Ah =
For wind speed =
Using qs = 0.5*ρ*V2
15.0 mph
=
283.5 sq.ft.
400.0 sq.ft
= 4.5' x 32' + 1/2(15.5' x 18') (avg lengths used)
= 17.5' x 17'
(avg lengths used)
22.0 ft/sec
where p = 0.002378 slug/cu.ft
Hence
qs =
0.58 psf
Cq =
=
Ce =
1.30
0.70
1.00
Horizontal
Uplift
Exposure coefficient not applicable
q = qs * Cq * Ce
=
=
0.75 psf - horizontal
0.40 psf - uplift
Hence: Total horizontal wind pressure
Ph-tot = q * A
=
212.1 lb - unfactored
=
318.1 lb - factored
Weight of Unit
Coefficient of friction
395 lb.
0.60 (assumed)
Hence, resistance to sliding
140.32 lb
Net Horizontal Load on Anchors
177.8 lb
Similarly for uplift loads
Pv-tot =
=
161.1 lb - unfactored
241.7 lb - factored
Sawyer, Duncan
& Associates
Report No:
Page No: 2
Date:
30-Mar-2012
Prepared By: M. Viechweg, P.Eng.
Subject:
MONSTER DRY SLIDE
Calculate Overturning Moments
Horizontal Load, P =
Center of Pressure, h =
Horiz center of gravity =
Moment due to Wind =
Moment due to (weight-uplift) =
Net Moment (Factored) =
Anchors
Number
3
1
212.1
5
6.25
1060.5
1461.7
-601.8
L, ft
13
15
lb
ft
ft
lb-ft
lb-ft
lb-ft
N*L^2
507.0
225.0
732.0
Load, lb
0.00
0.00
For this device, there are:
4 Anchors/side effective - Lateral
8 Anchors effective - Uplift
Summary
Total Gross Factored Load =
318.1 lb Lateral
241.7 lb Uplift
Total Net Factored Load =
Maximum vertical load per anchor, combining uplift and overturning
Hence Net Load/Anchor =
26.9 lb Lateral
0.0 lb Vertical
107.7 lb Lateral
0.0 lb Uplift
0.00 lb
Equivalent Anchor Weight =
45 lb.
(For lateral loads, considering friction effects)
Sawyer, Duncan
& Associates
Report No:
Page No: 3
Date:
30-Mar-2012
Prepared By: M. Viechweg, P.Eng.
Subject:
MONSTER DRY SLIDE
Anchor Pull-Out Load Allowable
Anchor Size: 18" submerged depth & 5/8" diameter
Angle: Vertical / Perpendicular to ground / 90 degrees
Upper Tethers: Angle of tethers to ground should be 60 - 80 degrees to reduce tripping hazzard
Use Phmax =
Pvmax =
300 lb. Lateral
200 lb. Vertical
Hence Min Factor of Safety on Wind Load @
15
mph
=
=
>10
>10
Lateral
Vertical
Maximum Allowable windspeed =
27.9
mph
and Min Factor of Safety on Wind Speed of
15
mph
=
1.9
Calculation of Windloads Acting on an
Inflatable Amusement Device
Introduction
This report details the method used in the calculation sheet attached. Various methods have
been considered, especially those contained in “Fluid Dynamic Drag”, Chapter 4, by Hoerner. However it
was decided to use the basic approach used in Building Codes since these are more readily accessible to
the reviewer and use very similar coefficients to those suggested by Hoerner.
It is impractical to make a detailed analysis of the forces on individual rides, taking account of
the wildly irregular shapes found on many designs. The approach here has been simplified to assume a
bluff body normal to the incident airflow. In cases where the inflatable device is cylindrical, or
otherwise shaped to significantly reduce the profile drag coefficient, the Engineer preparing the
calculations may choose to use a reduced CD in order to take this effect into account, thus avoiding
overly conservative results.
Assumptions
Windloads are calculated using the method outlined in the Uniform Building Code, Method 2 –
Projected Area Method, based on the assumption of a closed structure. This method is most
appropriate for the fully enclosed rectangular bouncer. Open irregular devices may experience lower
uplift loads than those calculated here due to turbulence and flow separation. It is assumed that the
device is firmly anchored to the ground and that the wind does not penetrate under the unit.
The calculation method used in the UBC (and all other Building Codes) makes use of a
gust/exposure coefficient. This is used to factor the general wind speed over a wide area to represent
the net local effect. In our case, we are concerned with the wind speeds measured at the site, hence any
addition (or reduction) due to exposure is not appropriate. Gusts still have to be taken into account,
and it is recommended that the wind speed used in the calculation be interpreted as the maximum gust
speed, rather than the average steady speed. The safety factor of 1.5 on calculated loads, plus the
generally conservative nature of the calculation method, will provide the operator with sufficient margin
of safety over the specified maximum operational wind speed.
Anchor Allowable Loads
Ultimate pull-out loads for typical 18” x 5/8” steel anchors have been determined by test and
these values are used in the new CEN Standard, prEN14960. The lateral pull-out value in that Standard
is 1600N, 360lb. We have reviewed the test data used for that Standard and have included the results
for vertical pull-out as well. Since the failure loads will be dependant on soil conditions, we have
reduced the test values to more modest levels in order to take account of these variations. Our standard
allowables are: horizontal 300lb, vertical 200lb.
The larger tent stakes, measuring 36” x 7/8” or more, commonly used for the extra large slides
have failure loads well in excess of 1,000lb. However the limiting factor now becomes the strength of
the anchor point on the inflatable, which is dependant on the strength of the fabric and the design of
the anchor point. From experience, we have determined that a typical allowable load on a single, welldesigned anchor point is no less than 600lb and this value will be used in the calculations. Considering
this, it is quite acceptable for one of those large tent stakes to be attached to two anchor points on the
inflatable.
Sawyer, Duncan & Associates
Windloads on Inflatable Rides
Page 1
Method of Calculation
Horizontal Forces
Pf = µ (W – Pu)
µ = coefficient of friction
It is assumed that anchors on the leeward side are not effective in reacting the horizontal forces.
Hence:
P – Pf = H1 + H3
Horizontal anchor reactions will be considered equal (i.e. H1 = H3)
Vertical Forces
Pu = W + R1 + R2 + R3 + R4
Vertical anchor reactions will be considered equal (i.e. R1 = R2 = R3 = R4)
Overturning Moment
Take moments about R2:
MR2
= P.h - (W – Pu)x
= R1.2x {+ R3(2x + y)}
Where R3 exists, the reaction on an individual anchor is calculated by:
R = M.L/ (n.L2)
Sawyer, Duncan & Associates
where: L is moment arm and n is number of anchors at that location
Windloads on Inflatable Rides
Page 2
NINJA JUMP
NEW PRODUCT SPEC SHEET
(Please Fill Out what is applicable and write N/A if the item does not apply to product or 0 if it does not have one)
All Sizes are inflated size
All items with * to be filled by Ninja Jump
PRODUCT NAME: Monster Dry Slide
* SKU:
Standard Inventory Item:
With Ramp
Without Ramp
Foot Prints / Schematic:
Attached
DATE: 09.28.11
3D Images:
Attached
Length: 35’0”
Width: 12’6”
Height: 18’0” (14’10” with out top arch)
Weight: 395 Lbs.
Slide Length: 12’9”
Width: 2’10”
Angle: 49 degree
Slide Blanket Length: 28’10”
Width: 2’10”
Weight:
Climb Width: 2’10”
Climb Angle: 60 degree
Landing Length: 12’5”
Platform Size:
2’0”x 2’10”
Slide Height From Ground: 10’2”
From Landing Area: 8’4”
Pool Dimension: L: N/A
W:
Depth:
Anchor Points: Low Level – Qty: 6
High Level – Qty: 2
Sign Banner Attachment Locations (example: one in the front and one on the right side): One (1) on
the right side railing near the exit.
Roof (Type & Material) (example: convertible, mesh, permanent, etc): Permanent mesh roof top of
the slide platform.
Velcro Drain (Qty & Location): N/A
Base Height: 1’10”
Color: Purple
Materials - Reinforced PVC “Light N’ Strong”
Unit Colors: Purple, Yellow, Lt. Blue, Red
Cushion Pad – Qty: 4
Horizontal zipper (Qty, Location & Size): Two (2). One(1) on the left side 36” long & One(1) on the
right side 36” long
Vertical zipper (Qty, Location & Size): N/A
Blower Tubes (Qty & Location): Two (2). One (1) on the right side & one(1) on the left side
Removable/Replaceable Part/s: Slide Blanket, Climb Cover, Cushion Pads – 4 pcs.
Rolled up size: L: 38”
W: 38”
H: 52”
* Recommended Blower/s: One (1) AA-1
* Clearance needed for set-up: 38’0”x 15’6”
*Max. # of Plyr: 2
*Max. Plyr wt: 250 Lbs
*Max. Plyr ht: 70”
Accessories included (example: mister hose, balls, etc): N/A
Obstacles included (example: pop ups, logs, etc): Climb, Slide
Other Notes:
Specsheet06.28.09
*Min. Plyr ht: 42”
Page 15 of 15